property of american airlines operator...walk around the tractor and inspect it for damage or...

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Chapter 1GT110 (24V0 Aircraft Tow Tractor Section 2

SECTION 2: OPERATION

A. PREOPERATIONAL CHECKS

CAUTION: BEFORE USING THE EQUIPMENT, THE OPERATORMUST CAREFULLY READ THE INSTRUCTIONS IN THE SAFETYSECTION OF THIS MANUAL AND IN THIS SECTION. THEOPERATOR MUST ALSO BECOME FAMILIAR WITH THE TOWTRACTOR’S CONTROLS, INDICATORS, AND EQUIPMENT ASDESCRIBED IN TABLES 2-1 thru 2-7 OF THIS SECTION.

CAUTION: NEVER RUN THE ENGINE WITH RECEPTACLECONNECTED TO THE OPTIONAL ENGINE COOLANT HEATER. AFLOW CHECK VALVE STOPS COOLANT FLOW THROUGH THEHEATER WHILE THE ENGINE IS RUNNING. THE HEATER WILL BEDAMAGED IF CONNECTED TO THE HEATER RECEPTACLE WHILETHE ENGINE IS RUNNING.

NOTE: In temperatures below 40 °F (4.4 °C), ensure that in units with anengine fuel heater option, heaters are operating 10 minutes prior to enginestarting and turned off before ENGINE STOP/RUN switch is placed in theRUN position.

NOTE: In temperatures below 40 °F (4.4 °C), ensure that units with anengine coolant heater option are connected to engine external power source 1hour prior to engine starting and operation.

In order to ensure safe, reliable operation, perform the following checks prior to operating the tractor:

1. Ensure the park brake switch is applied (set to ON).

2. Walk around the tractor and inspect it for damage or missing equipment.

3. Check for damaged or under-inflated tires. Check that cold tire pressure is 130 psi(896.3 kPa). Look for cuts and cracks in the tire’s sidewalls and for foreign objects in thetread.

4. Check the front/rear axle differential cases and planetary hubs for oil leaks.

5. Check for proper operation of the hitches.

Note

Note

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Chapter 1Section 2 GT110 (24V0 Aircraft Tow Tractor

6. Check for damage to the vehicle’s lights and beacons. Check that all lights are in properworking order.

7. Check that the fire extinguishers are in place and fully charged .

8. Look underneath the tractor for signs of leaking coolant, hydraulic fluid, transmission fluid,or lubricating oil. If significant leaks are found, repair them before using the unit for regualaroperation.

9. Check the engine oil.

WARNING: DO NOT LOOSEN OR REMOVE THE RADIATOR CAPWHEN THE COOLANT IS HOT. HOT COOLANT UNDER PRESSURECAN SPRAY OR BOIL OUT, CAUSING SEVERE BURNS.

10. Check that the engine coolant level is approximately 1-1/2 in (4 cm) below top of radiator fillneck. If not, add coolant as necessary, being careful not to overfill. Visually check forcoolant leaks.

11. Inspect the engine compartment for loose hardware, loose wires, and leaking lines or fittings.

12. Check the hydraulic fluid level in the sight glass on the hydraulic reservoir. The sight glass isslightly above eye level on the driver’s side of the vehicle between the front and rear axles. Avery low fluid level indicates a serious leak in the system. If that is the case, find the leak andrepair it immediately.

13. Check the operation of the hazard flasher, stoplights, taillights, headlights, backup lights, anddash panel lights.

14. Check the fuel level.

NOTE: By keeping the fuel tank as full as possible, the tendency formoisture to condense on the inner surfaces of the fuel tank can be minimizedor eliminated. Top off the fuel tank at the end of the day’s operation as partof the post-operation maintenance routine.

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CAUTION: IF THE EMERGENCY STEERING PUMP IS OPERATEDFOR MORE THAN 1 MINUTE, ITS MOTOR MAY OVERHEAT AND BEDAMAGED. DO NOT OPERATE THE EMERGENCY PUMP ANYLONGER THAN NECESSARY.

15. Place one hand on the steering wheel and the other on the Emergency Steering switch.Depress the switch and hold it down while turning the steering wheel a quarter turn or less ineach direction. Listen to the pump’s operation. The steering wheel should turn effortlesslyand the feel and sound should be smooth. Release the switch.

16. Start the engine. With the (foot) brake pedal depressed, cycle the transmission through allgears and allow transmission to reach 160 °F (71.8 °C). Return to neutral and check thetransmission’s oil level. Add oil as required but do not overfill.

B. TOW TRACTOR CONTROLS, INDICATORS AND OPERATIONAL EQUIPMENT

1. Table 2-1 lists the front cab controls, indicators, and equipment not found on the instrumentpanel and explains the specific function of each. Reference Figure 2-1 for location of theitems listed.

2. Table 2-2 lists the front cab instrument panel controls and indicators and explains the specificfunction of each. Reference Figure 2-2 for location of the items listed.

3. Figure 2-3 Steering Mode Selection Display.

4. Table 2-4 lists Cab Select Plate controls and indicators and explains the specific function ofeach. Reference Figure 2-4 for location of the items listed.

5. Table 2-5 lists the rear operator station option controls, indicators, and equipment not foundon the instrument panel and explains the specific function of each. Reference Figure 2-5 forlocation of the items listed.

6. Table 2-6 lists the rear operator station instrument panel controls and indicators and explainsthe specific function of each. Reference Figure 2-6 for location of the items listed.

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Figure 2-1. Front Cab Controls, Indicators and Equipment

1. Front cab controls, indicators, and equipment.

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Table 2-1. Front Cab Controls, Indicators and Equipment

ITEM NAME DESCRIPTION1 Hydraulic System Pressure Gauge This mehanical gauge indicates the hydraulic system

pressure2 Intercom Plug, Front Cab The front cab intercom plug is interconnected to plugs

located inside rear operator station (optional), on the front bumper, and on the rear bumper

3 Parking Brake Switch This switch is used to set the parking brake. To set the parking brake, move switch to ON position and observe that the parking brake applied indicators are illuminated. To release the parking brake, move the switch to OFF position.

4 Transmission Shift Selector The transmission shift selector selects the direction of travel and speed range of the tractor.

5 Horn Button The horn button is located in the center of steering wheel and sounds the horns. To sounds the horns, push in on the botton

6 Turn Signal and Hazard Switch This switch controls the turn signals and hazard warning lights. To indicate a left turn, pull the arm down. To indicate a right turn, push the arm up. The arm must be manually returned to the center position (OFF) after each turn. To actuate the hazard lights, pull outward (away from the steering wheel) on the tab, located directly behind the turn signal switch arm. To turn off the hazard lights, push up or pull down on the turn signal switch arm until the tab pops back into position.

7 Emergency Engine Shutdown Switch This switch shuts down the engine in a emergency. To use, press down on the red buttin. To reset, pull up the button.

8 Instrument Panel, Front Cab Refer to Figure 2-2 for desriptions of the instrument panel controls and indicators.

9 Turn Signal/Parking Light, L/H The turn signals flashes when the turn signal/hazard switch is set to signal a turn or hazard. The parking light will illuminate steadily when the parking lights switch is ON.

10 Headlight, L/H The headlight illuminates the area in front of the tractor when the headlights switch is in LO or HI and the parking light switch is ON.

11 Brake Pedal The brake pedal is foot operated and located in the front of operator and to the left of accelerator pedal. Pushing on it engages the service brakes.

12 Accelerator Pedal The accelerator pedal is foot-operated and located in the front of operator and to the right side of the brake pedal. It regulates the speed of engine.

ITEM NAME DESCRIPTION13 Disk Horn, 24V, High Note This is high tone, disk style sound making device. This

horn is used to warm others of the approach of the vehivle or of its presence.

14 Cab Ventilation Fans They provide cooling air circulation when activated by the integral swithes.

15 Disk Horn, 24V, Low Note This is low tone, disk style sound making device. This horn is used to warm others of the approach of the vehivle or of its presence.

16 Intercom Plug, Front Bumper This intercom plug accepts a communication cable linking the aircraft and the tow tractor.

17 Front Hitch Light This light illuminates the front hitch when the front hitch light switch is ON.

18 Heater/Defroster Unit It provides front cab heating and windshield defrosting. Its two-speed blower is controlled by the blower fan switch.

19 Headlight, R/H The headlight illuminates the area in the front of the tractor when the headlights switch is in LO or HI and the parking light switch is ON.

20 Turn Signal/Parking Light, R/H The turn signals flash when the turn signal/hazard switch is set to signal a turn or hazard. The parking light illuminates steadily when the parking lights switch is ON.

21 Fuse Box The fuse box contains fuses, relay and circuit breaker for electrical system circuit protection.

22 Warning Beacon The operator actuated beacon alerts others that the tow tractor is in operation.

23 Dome Light When turned ON by an integral switch, the dome light illuminates the cab's interior.

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Figure 2-2. Front Cab Instrument Panel

2. Front cab instrumental panel controls and indicators.

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Table 2-2. Front Cab Instrument Panel

ITEM NAME DESCRIPTION

1 Emergency Engine Stop Button This shuts down the engine in an emergency situation. Press down on the button to stop the engine. To reset, pull up on the button.

2 Left Turn Indicator This light illuminates when the left turn signal is on.

3 Low Oil Pressure Light This light illuminates whenever the engine oil pressure drops below 5.8 psi (39.99 kPa).

4 Engine Fault Light This light illuminates whenever the engine experiences a fault condition

5 Glow Plug Light This light illuminates whenever the glow plugs come on and goes out when they reach the proper temperature. The engine is then ready to start.

6 Alternator No Charge Light This light illuminates when the alternator is not charging the electrical system.

7 Dash Panel Lights The dash panel lights are used to illuminate the instrument panel during low-light conditions. These lights automatically turn on when the Parking/Headlight Switch is turned on.

8 Multifunction LCD Display Panel The multifunction LCD display shows vehicle and engine data gauges including: tachometer, vehicle speed, fuel level, coolant temperature, oil pressure and transmission oil temperature. The display will also show the user if any engine or transmission fault codes are present as well as give a description of the fault.When the tractor is in reverse, the display will change to show the rear view camera.

9 Transmission Warning Light This light illuminates when a problem occurs with the transmission.

10 Four-Wheel Steering System Warning Light

This light illuminates when a problem occurs with the four-wheel steering system.

11 High Beam Indicator This light tells the operator that high beam headlights are selected.

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Figure 2-2. Front Cab Instrument Panel (Cont'd)

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Table 2-2. Front Cab Instrument Panel (Cont'd)


12 Parking Brake Applied Light This light illuminates whenever the parking brake is engaged.

13 Right Turn Indicator This light illuminates when the right turn signal is on.

14 Transmission Display This displays gear selection, fault codes, and other information from the transmission. (See ZF operation manual located in Chapter 5.)

15 Engine Diagnostic Connector This connector attaches the Deutz programming cable to the port. (Only performed by an authorized Deutz or TUG representative. See the Deutz service manual in Chapter 5 for more details.)

16 Front Cab Lift Switch (Optinal) This switch lifts and lower front cab. Push and hold the switch as indicated to raise or lower the cab.

17 Headlight Mode Switch This switch selects the headlight mode. Pressing the switch to the upper position turns on the low beams and the lower position turns on the high. The headlights are turned on/off using the Parking/Headlight Switch.

18 Parking/Headlight Switch This 3-position switch controls the headlights and parking lights. The upper position turns off all lights, the middle position will illuminate the parking and dash lights. The lower position turns on the headlights.

19 Amber Beacon Switch This switch controls the amber beacon. Pressing the lower side of the rocker switch turns the hitch light on. Pressing the upper side of the switch turns it off.

20 Rear Hitch Light Switch This switch controls the rear hitch light when the tractor is being operated from the front cab. Pressing the lower side of the rocker switch turns the hitch light on. Pressing the upper side of the switch turns it off.

21 Front Hitch Light Switch This switch controls the front hitch light. Pressing the lower side of the rocker switch turns on the light. Pressing the upper side of the switch turns it off.

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Figure 2-2. Front Cab Instrument Panel (Cont'd)

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Table 2-2. Front Cab Instrument Panel (Cont'd)

ITEM NAME DESCRIPTION22 Emergency Steering Pump Switch This switch activates the emergency steering pump.

Press and hold the switch to start the pump. Release the switch to stop it. The steering pump activates only if the hydraulic system pressure is below 1800 psi. Do NOT press and hold the switch for more than 1 minute!

23 Rear Window Defroster Switch This momentory switch operates the rear window defroster. Press once to turn the defroster ON. The switch has timer relay that will turn the defroster OFF after 9-12 minutes. It can alse be manually turned OFF by pressing the defroster switch a second time.

24 Blower Heater Fan Switch (Optinal) The front cab's blower fan is controlled by this switch. The blower fan is used to heat the cab and has a HIGH and LOW speed position.

25 Heated Mirror Switch This momentory switch operates the heated mirrors. Press once to turn the heated mirrors ON, press again to turn it OFF.

26 Windshield Washer Switch Pressing and holding this switch will activate the windshield washers. Once the switch is released, the washers turn off.

27 Windshield Wiper Switch This 3-position switch controls the windshield wipers. The upper position turns the wipers on low speed, the middle position turns the wipers OFF. The lower position turns the wipers on high speed.

28 Switch, Starter The starter switch starts and stops the engine and connects and disconnects the electrical controls. The switch has three positions: STOP, RUN, and START. Moving the switch from STOP to RUN energizes the electrical system. Moving the switch from RUN to START starts the engine. (Once the engine starts, release the switch.) To stop the engine, place the transmission in neutral, set parking brake ON, and turn the switch to STOP.

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Figure 2-3. Front Cab Steering Display

The steering terminal allows the user to interact with the four wheel stering system. From this terminalthe operator can select a steering mode, view rear axle position/mode, and obtain diagnostic informationfor the steering system.

3. Front cab steering display.

LCD

TRACKMode

(Front-WheelSteering)

COORDMode

(Four-WheelSteering)

CRABMode

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4. Front cab select plate.

Figure 2-4. Front Cab Select Plate

Table 2-4. Front Cab Select Plate

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ITEM NAME DESCRIPTION1 Indicator, Front Cab Indicator light shows that front cab is selected2 Indicator, Rear Operator Station Indicator light shows that rear operators station is selected3 Indicator, Shifters In Neutral This green indicator illuminates if both front and rear

transmission sheifters are in Neutral4 Indicator, Front Park Brake Switch

OnThes red light is on if the front parking brake switch is set to ON and the Stop, Run, Start switch is in RUN

5 Indicator, Rear Park Brake Switch On

Thes red light is on if the rear parking brake switch is set to ON and the Stop, Run, Start switch is in RUN

6 Indicator, Park Brake Applied This red light comes on if the parking brake is applied and the STOP, RUN, START switch is in RUN

7 Indicator, Rear Shifter Not In Neutral

This red light indicates that the front shifter is not in Neutral

8 Cab Select Switch This switch shifts operational control from the front cab to rear ooperator station. It transfers control of the accelerator, parking brake, transmission, and steering; hower, service brake control remains active in both cabs regardless of which cab is selected.

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Figure 2-5. Rear Operator Station Controls, Indicators and Equipment

5. Rear operator station controls, indicators, and equipment.

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Table 2-5. Rear Operator Station Controls, Indicators and Equipment


1 Headlight, L/H The headlight illuminates the area in back of the tractor when the rear headlights switch is in activated.

2 Reverse Light, L/H The reverse light is ON when front cab shifter is in reverse position

3 Brake Light, L/H The brake light is on when front cab brake pedal is pushed.

4 Turn/Hazard Light, L/HThe turn signals flash when the turn signal/hazard switch is set to signal a turn or hazard. The parking light illuminates steadily when the parking lights switch is ON.

5 License Plate Holder License plate is to be installed on this holder.

6 Fire Extinguisher 20lb fire extinguisher. In case of emergency follow instructions located on the fire extiguisher

7 Intercom Plug, Front CabThe rear operator compartment intercom plug is interconnected to plugs located inside front cab and on the front bumper.

8 Emergency Engine Shutdown SwitchThis switch shuts down the engine in an emergency situation. Press down on the red button to stop engine. To reset, pull up the button.

9 Horn ButtonThe horn button is located in the center of steering wheel and sounds the horns. To sound the horns, push in on the botton

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Figure 2-5. Rear Operator Station Controls, Indicators and Equipment (Cont'd)

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Table 2-5. Rear Operator Station Controls, Indicators and Equipment (Cont'd)


10 Transmission Shift Selector The transmission shift selector selects the direction of travel and speed range of the tractor.

11 Rear Hitch Light This light illuminates the rear hitch when the rear hitch light switch is ON.

12 Instrument Panel, Rear Operator Station

Refer to Figure 2-4 for descriptions of the instrument panel controls and indicators.

13 Turn/Hazard Light, R/H

The turn signals flash when the turn signal/hazard switch is set to signal a turn or hazard. The parking light illuminates steadily when the parking lights switch is ON.

14 Brake Light, R/H The brake light is on when front cab brake pedal is pushed.

15 Reverse Light, L/H The reverse lights is ON when front cab shifter is in reverse position

16 Headlight, R/H The headlight illuminates the area in the back of the tractor when the rear headlights switch is activated.

17 Brake PedalThe brake pedal is foot operated and located in the front of operator and to the left of accelerator pedal. Pushing on it engages the service brakes.

18 Accelerator PedalThe accelerator pedal is foot-operated and located in the front of operator and to the right side of the brake pedal. It regulates the speed of engine.

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Figure 2-6. Rear Operator Station Instrument Panel

6. Rear operator station instrument panel.

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Table 2-6. Rear Operator Station Instrument Panel


1 Steering Terminal The steering terminal allows the user to interact with the four wheel steering system. From this terminal the operator can select a steering mode, view rear axle position/mode, and obtain diagnostic information for the steering system. (See Fig. 2-3 this Section)

2 Transmission Display This displays gear selection, fault codes, and other information from the transmission. (See ZF operation manual located in Chapter 5.)

3 Glow Plug Light This light illuminates whenever the glow plugs come on and goes out when they reach the proper temperature. The engine is then ready to start.

4 Alternator No Charge Light This light illuminates when the alternator is not charging the electrical system.

5 Low Oil Pressure Light This light illuminates whenever the engine oil pressure drops below 5.8 psi (39.99 kPa).


7 Transmission Warning Light This light illuminates when a problem occurs with the transmission.

8 Four-Wheel Steering System Warning Light

This light illuminates when a problem occurs with the four-wheel steering system.

9 Indicator, Front Shifter Not In Neutral


10 Indicator, Shifters In Neutral This green indicator illuminates if both front and rear transmission sheifters are in Neutral

11 Indicator, Front Park Brake Switch On

This red light is on if the front parking brake switch is set to ON and the Stop, Run, Start switch is in RUN

12 Indicator, Rear Park Brake Switch On This red light is on if the rear parking brake switch is set to ON and the Stop, Run, Start switch is in RUN

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Figure 2-6. Rear Operator Station Instrument Panel (Cont'd)

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Table 2-6. Rear operator Station Instrument Panel (Cont'd)



14 Parking Brake Switch This switch is used to set the parking brake. To set the parking brake, move switch to ON position and observe that the parking brake applied indicators are illuminated. To release the parking brake, move the switch to OFF position.

15 Cab Select Switch This switch shifts operational control from the rear cab to front cab. It transfers control of the accelerator, parking brake, transmission, and steering; hower, service brake control remains active in both cabs regardless of which cab is selected.

16 Indicator, Rear Operator Station Indicator light shows that rear operators station is selected

17 Indicator, Front Cab Indicator light shows that front cab is selected

18 Rear Hitch Light Switch This switch controls the rear hitch light when the tractor is being operated from the rear cab. Pressing the lower side of the rocker switch turns the hitch light on. Pressing the upper side of the switch turns it off.

19 Emergency Steering Pump Switch This switch activates the emergency steering pump. Press and hold the switch to start the pump. Release the switch to stop it. The steering pump activates only if the hydraulic system pressure is below 1800 psi. *Do NOT press and hold the switch for mor

20 Rear Work/Headlight Switch The rear work/ headlights are turned on/off using the Rear Work/Headlight Switch.

21 Emergency Engine Stop Button This shuts down the engine in an emergency situation. Press down on the button to stop the engine. To reset, pull up on the button.

22 Dash Panel Light The dash panel Light is used to illuminate the instrument panel during low-light conditions. This light automatically turns on when Parking/Headlight Switch is turned on

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Figure 2-7 Rear Cab Controls, Indicators and Equipment

7. Rear cab controls, indicators and equipment

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ITEM NAME Description

1 Intercom Plug, Rear Cab The rear cab intercom plug is interconnected to plugs located inside the front cab, on the front bumper, and on the rear bumper

2 Horn Button The horn button located in the center of the steering wheel, sounds the horns when pushed.

3 Emergency Stop Pulling up on this button will execute an emergency stop on the engine. To reset the emergency stop button, push down on it.

4 Park Brake Switch This switch sets the parking brake. Put the switch to ON position to set the parking brake. Observe that the rear parking brake ON and park brake applied indicators are illuminated. Put switch to the OFF position to release the parking brake.

5 Rear Cab Instrument Panel Refer to Figure 2-8 for description of the instrument panel controls and indicators

6 Stop/Park/Turn/BackUp Light Set, RH

This stop/ turn signal element flashes when the turn signal/hazard switch (item #6, Table 2-1) is set to signal a turn or hazard. The stop/turn element illuminates when the service brakes are applied. The parking element illuminates when the park lights are turned on. The backup light illuminates when the front cab shift selector is set to reverse.

7 Intercom Plug, Rear Bumper This intercom plug accepts a communication cable linking an aircraft and tow tractor.

8 Dash Panel Light The dash panel light illuminates the instrument panel in low-light conditions.

9 Transmission Shifter The transmission shift selector selects the direction of travel of the tractor. When operating from the rear cab, the speed range of the tractor is four forwards and three reverse gears

10 Stop/Park/Turn/BackUp Light Set, LH

The stop/turn signal element flashes when the turn signal/hazard switch (item #6, Table 2-1) is set to signal a turn or hazard. The stop/turn element illuminates when the service brakes are applied. The parking element illuminates when the park lights are turned on. The backup light illuminates when the front cab shift selector is set to reverse (R).

11 Service Brake Pedal The service brake pedal is in front of and to the right of the operator. It actuates the service brake system and operates similarly to an automobile brake pedal.

Table 2-7 Rear Cab Controls, Indicators and Equipment

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8. Rear cab dash panel

Figure 2-8 Rear Cab Dash Panel

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Table 2-8 Rear Cab Dash PanelITEM NAME DESCRIPTION

12 Transmission DisplayThis displays gear selection, fault codes, and other information from the transmission. (See ZF operation manual located in Chapter 5.)

13 Parking/Headlight Switch

This 3-position switch controls the headlights and parking lights. The upper position turns OFF all lights, the middle position will illuminate the parking and dash lights. The lower position turns on headlights.

14 Headlight Mode Switch

This switch selects the headlight mode. Pressing the switch to the upper position turns on the low beams and the lower position turns on high. The headlights turned on/off using the Parking/Headlight Switch

15 Rear Cab Select Plate This panel allow to select operation of the unit from front cab (Fig. 2-9)

16 Faceplate 4 Wheel Steering Display This panel has steering terminal (Fig. 2-3)

17 Parking Brake Applied Light This Light illuminates whenever the parking brake is engaged.

18 Four Wheel Sreering System Warning Light

This light illuminates when a problem occurs with four wheel steering system.

19 Emergency Steering Pump Switch

This switch activates the emergency steering pump. Press and hold the switch to start the pump. Release the switch to stop it. The steering pump activates only if the hydraulic system pressure is below 1800 psi. Do NOT press and hold the switch for more than 1 minute!

20 Blower Heater Fan Switch

The rear cab's blower fan is controlled by this switch. The blower fan is used to heat the cab and has a HIGH and LOW speed position.

21 Windshield Washer Switch

Pressing and holding this switch will activate the windshield washers. Once the switch is released, the washers turn off.

22 Windshield Wiper SwitchThis3-position switch controls the windshield wipers. The upper position turns the wipers on low speed, the middle position turns the wipers OFF. The lower position turns the wipers on high speed.



2 Emergency Engine Stop Button

This shuts down the engine in an emergency situation. Press down on the button to stop the engine. To reset, pull up on the button.

3 Left Turn Indicator This light illuminates when the left turn signal is on.

4 Low Oil Pressure Light

This light illuminates whenever the engine oil pressure drops below 5.8 psi (39.99 kPa)

5 Glow Plug LightThis light illuminates whenever the glow plugs come on and goes out when when they reach proper temperature. The engine is then ready to start

6 Alternator No Charge Light

This light illuminates when the alternator is not charging the electric system.

7 Dash Panel Lights The dash panel lights are used to illuminate the instrument panel during low-light conditions.

8 Multifunction LCD Display Panel

The multifunction LCD Display shows vehicle and engine data gauges including: tachometer, vehicle speed, fuel level, coolant temperature, oil pressure and transmission oil temperature. The display will also show the user if any engine or transmission fault codes are present as well as give a description of the fault.

9 Transmission Warning Light This light illuminates when a problem occurs with the transmission

10 High Beam Indicator This light tells the operator that high beam headlights are selected.

11 Right Turn Indicator This light illuminates when the right turn signal is on.

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9. Rear cab select panel. Table 2-9 Rear Cab Select Plate

Figure 2-9 Rear Cab Select Plate

1

3

8

4

65

7

2


1 Indicator, Front Cab Indicator light shows that front cab is selected

2 Indicator, Rear Operator Station Indicator light shows that rear operators station is selected

3 Indicator, Shifters In Neutral This green indicator illuminates if both front and rear transmission sheifters are in Neutral

4 Indicator, Front Park Brake Switch On

Thes red light is on if the front parking brake switch is set to ON and the Stop, Run, Start switch is in RUN

5Indicator, Rear Park Brake Switch On

Thes red light is on if the rear parking brake switch is set to ON and the Stop, Run, Start switch is in RUN


7 Indicator, Front Shifter Not In Neutral


8 Cab Select Switch

This switch shifts operational control from the front cab to rear ooperator station. It transfers control of the accelerator, parking brake, transmission, and steering; hower, service brake control remains active in both cabs regardless of which cab is selected.

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C. FRONT CAB OPERATOR'S SEAT

The standard operator and passenger suspension seat (Figure 2-10) features severaladjustments for the operator’s comfort and to position the seat for optimum access to allcontrols.

1. Lumbar Adjustment. To make the lumbar adjustment, turn knob until the seat is in desiredposition. Note symbols on knob (+ or - ) to increase or decrease, and turn knob in the desireddirection.

2. Back Angle Adjustment. To adjust backrest to the desired angle, turn knob until the backrestis in the desired position. Turning the knob in the clockwise direction will angle the seat tothe rear, and turning the knob counterwise will angle the seat back more forward.

3. Height Control Adjustment. To adjust height of seat to the desired position, turn knob asindicated by the plus (+) symbol to increase height of seat or turn knob in the direction of theminus (-) symbol to lower the seat.

4. Fore/Aft Adjustment. To move the seat fore or aft, pull the handle to the left, hold in position,slide the seat to the desired position, and release the handle.

Figure 2-10. Front Cab Seats

LUMBARADJUSTMENT

FORE/AFTADJUSTMENT

FRONT

FORE/AFTADJUSTMENT

HEIGHT CONTROLADJUSTMENT

BACK ANGLEADJUSTMENT

SIDE

BACKREST ADJUSTMENT

HORIZONTAL ADJUSTMENTWEIGHT ADJUSTMENT

REAR HEIGHTAND INCLINATION

ADJUSTMENT

FRONT HEIGHTAND INCLINATION

ADJUSTMENT

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FORE/AFTADJUSTMENT

FRONT

FORE/AFTADJUSTMENT

HEIGHT CONTROLADJUSTMENT

SIDE

The optional operator and passenger Scissor suspension seat (Figure 2-11) features severaladjustments for the operator’s comfort and to position the seat for optimum access to allcontrols.

1. Height Control Adjustment. To adjust height of seat to the desired position, turn knob asindicated by the plus (+) symbol to increase height of seat or turn knob in the direction of theminus (-) symbol to lower the seat.

2. Fore/Aft Adjustment. To move the seat fore or aft, pull the handle to the left, hold in position,slide the seat to the desired position, and release the handle.

Figure 2-11. Front Scissor Cab Seats (Optional)

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D. OPERATIONAL PROCEDURES

WARNING: NEVER OPERATE CONTROLS FROM OUTSIDEOPERATOR’S COMPARTMENT. SEVERE PERSONAL INJURY ORDEATH CAN RESULT.

1. Starting Procedure

WARNING: ENSURE THAT ALL PERSONNEL ARE CLEAR OF THETOW TRACTOR BEFORE STARTING THE ENGINE.

WARNING: DO NOT ATTEMPT TO ADJUST THE SEAT WHILE THETRACTOR IS IN MOTION. LOSS OF TRACTOR CONTROL MAYRESULT.

(a) Adjust the operator’s seat so that all controls may be comfortably reached.

(b) Verify that the parking brake switches are set to ON and the shift selector is in neutral(N), and the emergency stop button is not activated.

(c) Check that all other switches are OFF.

(d) Turn the STOP, RUN, START switch clockwise to RUN. The glow plug light willilluminate.

(e) Wait for the glow plug light to extinguish. This is a signal that the engine is ready tostart.

CAUTION: TO AVOID OVERHEATING OF STARTER MOTOR, DO NOTOPERATE STARTER MOTOR MORE THAN 30 SECONDS WITHOUTALLOWING A MINIMUM COOLING PERIOD OF 2 MINUTES.

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(f) Turn the STOP, RUN, START switch to START.

(g) Start the engine and then check the engine oil pressure gauges and the voltmeter.Observe that they are within limits. Ensure that all warning indicators areextinguished.

NORMAL OPERATING CONDITIONS

SYSTEM NORMAL

Temperature 185-200°F (85-93 °C)Engine Oil Pressure 30-90 psi (241-621 kPa)Transmission Fluid Temperature 160-210 °F (71-99°C)Voltmeter +24 Volts

(h) Allow the engine to idle for approximately 5 minutes (warm up).

(i) Turn on all necessary system switches (lights, etc.) for the operation. An operationalcheck of all accessory systems should be performed at this time, ensuring theyoperate properly.

(j) Turn the steering wheel until the wheels are in the straight-ahead position. Set thesteering mode select switch to the desired steering mode.

(k) Depress the foot brake pedal. Release the parking brake by setting the parking brakeswitch to OFF and wait until the PARK BRAKE indicator light extinguishes.

(l) Select the desired direction of travel and speed range by placing the shifter in the gearmost appropriate for the speed and weight of the tow.

WARNING: DO NOT SHIFT TRANSMISSION WHILE HANDLINGAIRCRAFT.

(m) Release the foot brake pedal and slowly depress the accelerator pedal.

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2. Parking Brake Operation

WARNING: ALWAYS SET THE PARKING BRAKE ON BEFORESHUTTING OFF THE ENGINE OR EXITING THE CAB. FAILURE TOSET THE PARKING BRAKE CAN RESULT IN THE TRACTORROLLING AWAY, CAUSING SEVERE PERSONAL INJURY, DEATH,AND/OR PROPERTY DAMAGE.

CAUTION: THE PARKING BRAKE MUST BE RELEASED BEFORETHE TRACTOR IS MOVED. EXCEPT IN AN EMERGENCYSITUATION, DO NOT APPLY THE PARKING BRAKE WHILE THETRACTOR IS IN MOTION. PARKING BRAKE DAMAGE WILL OCCUR.

(a) To set the park brake, move the parking brake switch to the ON position, and observethat the park brake applied indicator illuminates.

(b) To release the park brake, move the parking brake switch to the OFF position, andobserve that the park brake applied indicator turns off.

NOTE: The parking brake must be released (set to OFF) before any forwardor reverse gear is selected via the transmission shift selector. If not, the hornwill sound as a warning.

(c) The remote hand pump, located above the passenger side ballast compartment,provides a means of releasing the parking brake should the main piston pump and theemergency pump fail. To use the emergency hand pump, follw these steps:

(1) Push down on the black knob and rotate clockwise.

(2) Remove the handle from its storage location and insert it into the hand pump.

(3) Pump until 1800 psi is shown on the gauge. DO NOT EXCEED 2500 psi.

(4) To reactivate the park brake, push down on the knob and rotate counter-clockwise.

Note

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3. Transmission Range Selection

(a) The transmission selector is an electronic control unit with a stick type selector.There is a forward and reverse selector side for the transmission selector. The selectorcontrol normally resides in the neutral position. The desired direction of travel isalways selected starting from the neutral position. Forward gears are selected bydepressing the button on top of the shifter joystick and pushing it forward. Pushingthe joystick to the right will up-shift and pushing it to the left will down shift. Thedesired gear can be observed on the gauge on the dash. Reverse is done in theopposite manner. Depressing the button on top of the joystick and pulling back on it,will select Reverse 1. To up-shift, follow the same procedures as for selecting aforward gear. Note there are 4 forward speeds and 2 reverse speeds.

(b) The ZF Powershift transmission must be manually shifted into the desired gear. Usethe gear most appropriate for the conditions. Shift to the next higher speed when thetop speed in any particular gear is reached. Do not tow farther than 6.2 miles (10 km)or faster than 6 mph (10 km/hr). Only tow aircraft in first or second gear.

(c) Generally, up shifting and down shifting is best accomplished by shifting through thenormal sequence of speeds. Downshifting will produce a braking effect, unless theengine is stopped. In that case, no braking will occur.

(d) Stop the tractor before shifting into any reverse speed.

CAUTION: DO NOT COAST THE TOW TRACTOR IN NEUTRAL.DOING SO MAY RESULT IN SEVERE DAMAGE TO THETRANSMISSION.

CAUTION: NEVER SHIFT FROM ANY FORWARD GEAR TO REVERSEOR FROM REVERSE TO ANY FORWARD GEAR WHILE THETRACTOR IS IN MOTION. THE TRACTOR CAN BE DAMAGED ORSTOP SUDDENLY.

(e) Neutral (N). Select Neutral when starting the engine, when checking the tractor’saccessories, and when idling the engine for extended periods. Use NEUTRAL withthe parking brake set if leaving the tractor unattended with the engine running.

(f) 1-2-3-4 Range Selections. Occasionally, certain conditions make it necessary torestrict shifting to a lower range. In addition to more pulling power at lower speeds,these selections provide progressively greater engine braking for going down mediumgrades. (The lower the gear range, the greater the braking effect.)

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(g) Reverse 1-2. Select a speed range in Reverse adequate to the task at hand. Thereverse gears work in the same manner as the forward speed ranges.

(h) Rear Cab Shift Selector. The Rear Cab Shift Selector is tagged with four forwardspeeds and two reverse. The third and fourth forward gears are the same. Otherwise,the rear cab shifter operates identically to the front cab shifter.

4. Cab SelectionTo transfer operational control between the front and rear cabs.

switch

Table 2-12. Cab Select Plate

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WARNING: MOVING THE CAB SELECT SWITCH WHILE THETRACTOR IS IN MOTION CAN CAUSE THE TRACTOR TO LOSECONTROL, POSSIBLY RESULTING IN DEATH, SEVERE PERSONALINJURY, OR PROPERTY DAMAGE.

(a) Stop the tractor.

(b) Return the transmission shift selector to neutral (N).

(c) Set the parking brake switch to the ON position, and observe that the park brakeapplied indicator illuminates.

CAUTION: PRESS THE RELEASE LATCH (THE RAISED PORTION OFTHE ROCKER SWITCH) PRIOR TO MAKING A SELECTION FROMFRONT TO REAR OR FROM REAR TO FRONT CAB CONTROLSELECTION. FORCING THE SWITCH INTO POSITION WILLDAMAGE THE LOCKING DEVICE, ALLOWING THE SWITCH TO BEACCIDENTALLY ACTIVATED.

(d) To select front to rear or rear to front cab control, press the release latch (the raisedportion of the rocker switch) and press the rocker switch to make the selection. Theswitch should lock in position. All controls except the service brake pedal willtransfer to the other cab. To make another cab control selection, the change must beinitiated from the cab (front or rear) that was selected.

5. Steering Mode Selection

WARNING: BEFORE ATTEMPTING TO USE THE U-30 AIRCRAFTTOW TRACTOR, THE OPERATOR AND ASSOCIATED GROUNDSUPPORT EQUIPMENT EMPLOYEES MUST BE TRAINED ON THEOPERATION OF THE UNIT AND ITS STEERING MODES. ALLPERSONNEL SHOULD REMAIN AWARE OF POSSIBLE DANGEROUSSITUATIONS TO AVOID SERIOUS INJURY OR DEATH.Prope

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WARNING: WHEN THE GT110 UNIT IS IN OPERATION, ALLPERSONNEL EXTERNAL TO THE VEHICLE NEED TO MAINTAIN ASAFE DISTANCE FROM FRONT AND REAR WHEEL WELLS TOAVOID CONTACT WITH THE WHEELS OR BECOME TRAPPEDBETWEEN THE VEHICLE FRAME AND THE WHEEL:

· SINCE THE GT110 CAN STEER WITH FOUR WHEELS, IT IS VERYAGILE AND CAN CHANGE DIRECTION / MOVE SIDEWAYSMUCH FASTER THAN A CONVENTIONAL ROAD VEHICLE;

· WHEN STEERING, THE WHEELS WILL PROTRUDE OUTSIDETHE WHEEL WELL;

· IN CERTAIN CIRCUMSTANCES, THE WHEELS MAY ALIGN FORSTRAIGHT AHEAD OR TURN LEFT / RIGHT EVEN WHEN THEVEHICLE IS STATIONARY.

THEREFORE, MAINTAINING A SAFE DISTANCE TO AVOIDCONTACT IS CRITICAL.

(a) The steering modes are operated through a Steering Logic Controller (SLC). The SLCcontains an LCD display and eight white buttons, with blue back lighthing, toconfirm the mode selected. On the GT110 unit, only the three left white buttons onthe top row are utilized (see Figure 2-13).

(b) When the Start/Run/Stop switch is moved from Stop to Run, the LCD display back-lighting will illuminate and “TUG Technologies Corporation” will be written in thedisplay for a period of about 3-5 seconds. Simultaneously, the (8) blue lights willilluminate for about 5 seconds. The company name will extinguish and two audiobeeps will be heard and all (8) lights will flash in synchronization.

(c) After the two audio beeps, seven of the (8) lights will extinguish and one will remainbrightly illuminated. The single blue light illuminated will be the TRACK (frontwheel steering) mode button because this is the default steering mode. If the rearwheels are not centered at this point, the light will be flashing. There are three waysto bring rear axle into center position.

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(1) Press and hold the TRACK mode button.

(2) Turn the steering wheel back and forth.

(3) Turn off the park brake, place the tractor into gear, and start moving in eitherforward or reverse. The rear axle will slowly swing into the center positionas the tractor moves.

With any of these methods, the blue light will become solid (and discontinueflashing) when the rear axle is centered. The screen will display the image shown inFigure 2-14, also indicating a centered rear axle.

(d) With the GT-110 park brake on, and the unit running, ensure that no one is near thetractor as the axles will be turning.

Figure 2-13. Steering Logic Controller (SLC)

LCD

TRACKMode

(Front-WheelSteering)

COORDMode

(Four-WheelSteering)

CRABMode

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(e) Press the key pad button for the desired steering mode. If both axles are centeredthen the selected mode button will be blue. If the light is flashing, press and hold thebutton until this light turns solid. The steering system is now in the desired steeringmode and can be driven normally.

NOTE: Alternatively, the steering wheel can be turned back and forth or thetractor can be placed into gear and be allowed to move. Either of theseactions will cause the rear axle to automatically align to the correct positionbased on the front axle’s position.

(f) The LCD display always shows the position of the rear axle because the rear axle isthe only axle being controlled by the steering computer. The front axle is solelycontrolled by the steering wheel (i.e. the operator).

(g) The steering mode can be changed at any time while the transmission is in first orsecond gear AND the steering angle is less than 10 degrees to either the right or left.

Rear axle turned all the way to the left Rear axle centered

Figure 2-14. Rear Axle Indicators

Note

<L R> <L R>

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(h) The steering mode can be changed at any angle while the transmission is in neutral.

(i) If the transmission is placed into either 3rd or 4th gear, the LCD display will give awarning beep and will place the system into TRACK mode. If the tractor is moving,the rear axle will lock into place the next time that the operator brings it to the centerposition. If the tractor is not moving, turning the steering wheel will move the rearaxle to the center position automatically. For safety reasons, no other modes besidesTRACK mode can be used in 3rd or 4th gears due the achievable speeds in thesegears.

(j) When the transmission is downshifted to 1st or 2nd gear, the steering mode can againbe switched to any of the three modes but will remain in TRACK mode until anothermode is chosen.

6. Front Cab Lift OperationTo raise or lower the front cab:

WARNING: FULLY LOWER THE CAB PRIOR TO EXITING TO AVOIDPOSSIBLE INJURY.

WARNING: DO NOT LOWER THE CAB UNTIL ASSURED THAT NOPERSONNEL ARE NEAR OR UNDERNEATH IT. DO NOT LOWER ORRAISE THE CAB IF ANYONE ELSE IS ENTERING OR EXITING ORWORKING NEAR THE FRONT HITCH. OTHERWISE, SEVEREPERSONAL INJURY MIGHT RESULT.

(a) Check that no one is entering, exiting, or close to the cab before beginning to raise orlower the cab.

(b) Press and hold the upper part of the CAb Lift Switch to raise the cab. Press and holdthe lower portiion of the Cab Lift Switch to lower cab.

(c) Once the desired cab height has been reached, release the Cab Lift Switch.

7. Back Up AlarmThe back-up alarm activates automatically anytime the transmission is put into Reverse (R)and the tractor’s START-RUN-STOP switch is in RUN. Since it is wired into the same circuitas the back-up lights, it will sound anytime the back-up lights are on.

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Note: Failing to allow the engine to cool down properly may causepermanent damage to the turbocharger assembly.Note

8. Moving an AircraftEach individual airline has established procedures for attaching the tractor to an aircraft,detaching the tractor from an aircraft, or for towing or pushing back an aircraft. All operatorsmust be familiar with these procedures prior to operating the tractor in any aircraft relatedoperations. Aircraft should only be towed in low gear to prevent transmission/power trainoverheating.

9. Shutdown Procedure

(a) Bring the tractor to a full stop.

(b) Place the transmission in Neutral (N).

(c) Set the parking brake switch to ON.

(d) Turn off all system and accessory switches.

(e) Allow the engine to run at idle for approximately 5 minutes, then shut it down byturning the STOP, RUN, START switch to STOP.

10. Centralized On-Board Chassis Lubrication SystemThis system will automatically or manually provide lubricant to several points on the towtractor, including king pins, ball joints, steering cylinders, and bolsters. The system requiresmanual lubrication if the lines have run out of grease or have been drained for any reason.The lube system unit is centrally located on the front bulkhead within the enginecompartment. To manually lubricate the system, press the pushbutton located on the bottomof the unit (Figure 2-15).

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1

2

Figure 2-15. Autmatic Lubrication System Reservoir

11. Internal Jacking System (Option)

(For tractors that do not have this option, please refer to Chapter 2, Section 1 for jackinginstructions).

WARNING: BE CERTAIN THAT ALL PERSONNEL ARE CLEAR OFTHE UNDERSIDE AND ARE WELL AWAY FROM THE TRACTORPRIOR TO USING THE INTERNAL JACKING FEATURE.

Note: The tractor's engine must be running, the parking brake set to "ON",and the transmission shifter must be in neutral (N) for the system to work.

(a) To raise the tractor using the internal jacking system:

(1) Visually ensure that personnel are not near or underneath the tractor.

(2) Check that the parking brake is ON and that the transmission shifter is inneutral (N). Start the engine.

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CAUTION: TO AVOIUD GETTING THE TRACTOR INTO POSSIBLYUNSTABLE POSITION, DO NOT RAISE BOTH ENDS OF IT AT THESAME TIME.

(3) Open the jacking system shuoff valve.

(4) Each jacking system valve handle on the jacking system valve assemblycontrols one jack. Select the valve(s) that operate(s) the desired jack(s). It isrecommended that one side of the tractor be raised at a time.

(5) Pull out the valve handlr(s) to lower the jack(s) and raise the vechicle. Holdthe valve handle out until the tractor reaches the desired height.

(6) Repeate steps (4) and (5) as necessary.

WARNING: PLACE BLOCKS OR JACK STANDS OF ADEQUATECAPACITY UNDERNEATH THE VEHICLE BEFORE ALLOWINGPERSONNEL TO WORK ON OR NEAR IT. DEATH OR SEVEREINJURY COULD OTHERWISE RESULT.

(7) Place blocks or jack stands underneath the tractor before performing anywork.

(8) Shut down the engine (if prudent) to avoid unnecessary risk during anymaintenance procedures.

(b) To lower the tractor using the internal jacking system:

WARNING: BE CERTAIN THAT ALL PERSONNEL ARE CLEAR OFTHE UNDERSIDE AND ARE WELL AWAY FROM THE TRACTORPRIOR TO LOWER IT.

(1) Visually ensure that personnel are not near or underneath the tractor.

(2) Remove the blocks or other supporting materials from underneath thevehicle.

(3) Check that the transmission is still in neutral (N), parking brake is ON, andstart the engine if it has been shut down.

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(4) To lower the tractor, push in the appropriate jack operating valve handle(s) asrequired until tractor is completely down.

(5) Once the tractor is lowered, push in and hold the appropriate jack handle(s)until each jack is fully retracted.

(6) Close the jacking system shutoff valve

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property of american airlines operator...walk around the tractor and inspect it for damage or...

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