cx31 cat transmission-student handout
DESCRIPTION
Cat Transmission-studentTRANSCRIPT
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1TCL017 Engineering Drawings
CX31 CAT TRANSMISSION
2TCL017 Engineering Drawings
• New Cat Product• 6 speed• Planetary gear• Powershift transmission• Compatible with C9-C15 Cat Engine• Torqon with lock up & free wheel stator• Optional retarder
Introduction
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3TCL017 Engineering Drawings
• Electronic Clutch Pressure Control (ECPC)• Separate transmission ECM• Gear type hydraulic pump
Introduction
4TCL017 Engineering Drawings
• Transmission control group at cab• R – Reverse• N – Neutral• D – Drive• Autoshift in 1st – 6th gear• ↑↓ - select max up shift speed
Introduction
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5TCL017 Engineering Drawings
Major Component
2. Transmission oil filter7. Pressure taps for main relief valve and
torque converter outlet pressures
6TCL017 Engineering Drawings
Major Component1. Magnetic screen3. Relief valve group4. Oil filter bypass valve5. Transmission main relief valve6. Torqon outlet relief valve
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7TCL017 Engineering Drawings
1. Cover2. Cover3. Hydraulic Pump4. Transmission ECM
Major Component
8TCL017 Engineering Drawings
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9TCL017 Engineering Drawings
Speed Vs Clutches Engaged
Neutral 5Reverse 3 and 51st Forward 1 and 52nd Forward 1 and 43rd Forward 1 and 34th Forward 1 and 25th Forward 2 and 36th Forward 2 and 4
10TCL017 Engineering Drawings
Torque Converter
• Inlet housing & Impeller (1)• Turbine & Output Shaft (2)• Freewheel stator 3)
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11TCL017 Engineering Drawings
12TCL017 Engineering Drawings
Relief valve group
1. Main relief valve 2400 kPa (350 psi)
2. Torque converter outlet relief valve ≅500 kPa (70 psi)
3. Torque converter inlet relief valve
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13TCL017 Engineering Drawings
14TCL017 Engineering Drawings
Transmission ECM function to determine the desired transmission gear and to energize the appropriate solenoids to shift the transmission up or down as required based on information from both the driver and truck
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15TCL017 Engineering Drawings
Transmission ECM provides diagnostic capabilities, stored in onboard memory. Technicians should use the Caterpillar
Electronic Technician (Cat ET) for troubleshooting
16TCL017 Engineering Drawings
Transmission calibration is performed automatically on the CX31 and CX35 transmissions. It is not necessary to manually calibrate the transmission
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17TCL017 Engineering Drawings
Transmission push button shift pad
• Mode switch (1) : Economy mode or standart mode
• Arrow keys (2) to limit the maximum transmission upshift speed
• LCD screen (3) displays the status of the transmission
18TCL017 Engineering Drawings
Transmission push button shift pad
• The left digit displays the maximum available gear
• The right digit displays the actual gear
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19TCL017 Engineering Drawings
Transmission electronic control component
• Transmission ECM (1).• Engine input speed
sensor (2)• Output speed sensors (3)• Solenoid valve (4)• Lock up solenoid valve
(5)• Filter bypass pressure
sensor (6)• Torque converter output
shaft speed sensor (7)
20TCL017 Engineering Drawings
Transmission electronic control component
• Torque converter oil temperature sensor (1)
• Transmission filter bypass switch (2)
• Transmission oil level sensor (3)
• Transmission oil temperature sensor (4)
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21TCL017 Engineering Drawings
22TCL017 Engineering Drawings
ECPC system operation
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23TCL017 Engineering Drawings
ECPC system operation
24TCL017 Engineering Drawings
ECPC system operation
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25TCL017 Engineering Drawings
Transmission Pressure Check
• Main relief pressure tap (1)
26TCL017 Engineering Drawings
Transmission Pressure Check• Cap (2)• The torque converter
outlet relief valve pressure tap (3)
• Cap (4)• Cooler inlet pressure tap
(5)• Torque converter inlet
pressure tap (6)
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27TCL017 Engineering Drawings
Transmission Test Port Location1. TC outlet temp (ET)2. Filter inlet pressure3. Main relief pressure4. TC inlet pressure5. TC outlet pressure6. Cooler inlet pressure7. Lube pressure location8. Lockup Clutch9. Clutch 1 ECPC10. Clutch 2 ECPC11. Clutch 3 ECPC12. Clutch 4 ECPC13. Clutch 5 ECPC
28TCL017 Engineering Drawings
rpmrpmrpmPort Location
13. Clutch 5 ECPC
12. Clutch 4 ECPC
11. Clutch 3 ECPC
10. Clutch 2 ECPC
9. Clutch 1 ECPC
8. Lockup Clutch
2140 – 138 kPa(310 – 20 psi)
7. Lube pressure location
6. Cooler inlet pressure
275 kPa(40 psi)
5. TC outlet pressure
1034 kPa(150 psi)
4. TC inlet pressure
2415 kPa(330 psi)
3. Main relief pressure
2140 – 138 kPa(310 – 20 psi)
2. Filter inlet pressure
1. TC outlet temp (ET)
2100Actual
1400Actual
600Actual
2100Actual
1400Actual
600Actual
Spec2100Actual
1400Actual
600Actual
90C+ (194F+) sump80C (176F) sump50C (122F) sump
CX31 Transmission Test Chart
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29TCL017 Engineering Drawings
30TCL017 Engineering Drawings
Always use the latest service information to ensure that the most current specifications
and test procedures are used
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31TCL017 Engineering Drawings
PREVENTIVE MAINTENANCE
32TCL017 Engineering Drawings
Transmission Oil
The CX Series of on-highway transmissions are designed to operate with ATF fluids that meet
Caterpillar AT-1 or Dexron® IIIH specifications. Cat ATF-HD, a new automatic transmission fluid
This fluid has been tested and approved by Caterpillar for use with the Cat® CX28,
CX31 and CX35 transmissions
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33TCL017 Engineering Drawings
Transmission Oil Capacities (Refill)
27 L (7 US gal)49 L (13 US gal)CX31 with Retarder
25 L (6.5 US gal)45 L (12 US gal)CX31 Standard Sump
20 L (5.3 US gal)38 L (10 US gal)CX31 Shallow Sump
Service RefillEstimated Initial FillTransmission Type
34TCL017 Engineering Drawings
Daily
• Transmission Oil Level - Check
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35TCL017 Engineering Drawings
Initial 200 Hours/8000 Km/5000 Miles
• Oil Filter (Transmission) - Replace
36TCL017 Engineering Drawings
500 Hours / 6 Months / 20 000 Km / 12 000 Miles
• Magnetic Screen (Transmission) - Clean • Oil Filter (Transmission) – Replace• Transmission Oil - Change • Transmission Oil Sample - Obtain
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37TCL017 Engineering Drawings
1000 Hours /1 Year / 40 000 Km / 25 000 Miles
• Magnetic Screen (Transmission) – Clean• Oil Filter (Transmission) – Replace• Transmission Oil - Change • Transmission Oil Sample - Obtain
38TCL017 Engineering Drawings
2000 Hours / 2 Years / 80 000 Km /50 000 Miles in General Applications
• Oil Filter (Transmission) – Replace• Transmission Oil Sample - Obtain
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39TCL017 Engineering Drawings
2000 Hours / 2 Years / 80 000 Km / 50 000 Miles in Severe Applications
• Magnetic Screen (Transmission) - Clean • Oil Filter (Transmission) - Replace • Transmission Oil - Change • Transmission Oil Sample - Obtain
40TCL017 Engineering Drawings
3000 Hours / 3 Years / 120 000 Km / 75 000 Miles in General Applications
• Oil Filter (Transmission) – Replace• Transmission Oil Sample - Obtain
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41TCL017 Engineering Drawings
3000 Service Hours or 3 Years or 120 000 Kilometers (75 000 Miles) in Severe
Applications• Magnetic Screen (Transmission) - Clean • Oil Filter (Transmission) – Replace• Transmission Oil - Change • Transmission Oil Sample - Obtain
42TCL017 Engineering Drawings
4000 Hours / 4 Years / 240 000 Km / 50 000 Miles in General Applications
• Magnetic Screen (Transmission) - Clean • Oil Filter (Transmission) – Replace• Transmission Oil - Change • Transmission Oil Sample - Obtain
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43TCL017 Engineering Drawings
Transmission Oil Level - Check
• Warmed to operating temperature• Engine LOW IDLE• Transmission NEUTRAL• Vehicle in level ground• Check level at dipstick in filler tube
(#1)
44TCL017 Engineering Drawings
Oil Filter (Transmission) - Replace
• Remove filter drain plug (3), drain• Install drain plug, tighten 18 ± 3.5
Nm (13 ± 3 lb ft)• Remove oil filter housing (1)• Discard the used oil filter element• Inspect the seal in the housing• Install the new oil filter element • Install housing (2) & the new
element into filter base (1)• Tighten 55 ± 5 N·m (41 ± 4 lb ft)
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45TCL017 Engineering Drawings
Magnetic Screen (Transmission) - Clean
• Remove drain plug (1)• Install, torque 35 ± 10 N·m
(26 ± 7 lb ft)
46TCL017 Engineering Drawings
Magnetic Screen (Transmission) - Clean
• Remove 3 bolts for access plate (2)
• Remove suction screen & magnetic filter inside
• Inspect & Clean, use stiff bristle brush
• Install magnetic filter, suction screen
• Install access plate, tighten 28 ±7 N·m (21 ± 5 lb ft)
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47TCL017 Engineering Drawings
Transmission Oil - Change
• Perform magnetic screen cleaning procedure
• Fill transmission case with oil through filler tube, refer to refill capacity
• Vehicle on level ground• Transmission is in NEUTRAL• Engine at LOW IDLE • Check oil level on dipstick
48TCL017 Engineering Drawings
Transmission Oil Sample - Obtain
• Run engine until reach operating temperature
• Take oil sample from sampling valve (1)
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49TCL017 Engineering Drawings