"F" SERIES (Cont.) F 1 0 0 SERIES G O V E R N O R

GOVERNOR ASSEMBLY AND OPERATION (EARLY MODELS BEFORE 1 98 1 ) (HEX SHAPED, GOVERNOR COLLAR)

The governor air vane assembly is an in- As mowing conditions change the governor tegral component of the carburetor. The air vane responds instantly to engine run- governor air vane (part of the throttle shaft) ning demands. The function of the governor extends through a "tunnel" in the shroud air vane is to control engine speed. An alti- mounting base. As the flywheel rotates an tude adjustment needle regulates the right air flow is created against the air vane amount of fuel with the correct amount of which opens or closes the throttle shaft. incoming air,

"F" SERIES (Cont.) F 1 0 0 SERIES GOVERNOR

REMOVING AIR VANE ASSEMBLY (EARLY MODELS) (HEX SHAPED GOVERNOR COLLAR) SAFETY WARNING

1. Remove two carburetor mounting screws USE CARE WHEN REMOVING CAR- and remove carburetor and air vane as- BURETOR AND AIR VANE ASSEM- sembly as shown. Special care MUST BE BLY FROM ENGINE. DAMAGE TO taken when removing carburetor to pre- AIR VANE WILL CREATE AN EN- vent damaging air vane assembly. GINE OVERSPEED CONDITION.

AIR BAFFLE REMOVED FOR CLARITY

2. Release governor spring tension by gently raising hex shaped governor ad- justing collar until collar is above ribs on speed control lever. Rotate adjust- ing collar clockwise until two ends of governor spring are aligned. Lower ad- justing collar back onto speed control lever.

3. Using needle nose pliers remove throttle disc from throttle shaft as shown. Note position of throttle disc so during reas- sembly disc is installed correctly. Ex- amine throttle disc for excessive wear.

4-45

"F" SERIES (Cont.) F 1 0 0 SERIES GOVERNOR

(EARLY MODELS) (HEX SHAPED GOVERNOR COLLAR)

4. Lift air vane and throttle shaft slightly and unhook upper end of governor spring from air vane hub as shown. Remove air vane and throttle shaft.

8. Examine all components removed for damage o r wear and replace as required.

4-46

5. Carefully remove governor spring from governor adjusting collar.

6. Remove governor adjusting collar.

7. Using a wide bit screw driver, a s shown, GENTLY pry upwards on hub of speed control lever until speed control lever is free of retaining lug on carburetor. Remove speed control lever,

NOTE

USE CAUTION WHEN PRYING UP- WARDS ON THE LEVER TO PRE- VENT DAMAGING THE SPEED CONTROL LEVER.

CARBURETOR AIR VANE ASSEMBLY

CONTROL LEVER THROTTLE

DISC

"F" SERIES (Cont.) F 1 0 0 SERIES GOVERNOR

REASSEMBLY GOVERNOR ASSEMBLY (EARLY MODELS) (HEX SHAPED GOVERNOR COLLAR)

1. Assemble speed control lever to carbu- 3. Insert straight end of governor spring into slot retor. The hub of the lever is retained of adjusting collar.

down when installing lever until hub "snaps" into position.

a lug or tab on the press 4. Insert air vane and throttle shaft into carbu- retor. Using needle nose pliers insert throttle disc into throttle shaft with flat edge of disc facing up, and small hole in disc facing air fil- ter and two raised dimples in disc facing you. Rotate air vane and throttle shaft assembly. Assembly should move freely.

2. Install governor adjusting collar to speed con- trol lever with spring slot facing you.

5. Preset governor spring tension by raising up- ward on governor adjusting collar as shown and rotate collar 1/2 turn (with speed control lever in HIGH SPEED position or 1/4 turn if speed control lever is in LOW SPEED position) COUNTERCLOCKWISE as illustrated. Lower adjustment collar onto speed control lever.

THE SPEED CONTROL LEVER CON- TAINS S P L I N E S . EACH SPLINE REPRESENTS 50-75 RPM. ROTAT- ING ADJUSTING COLLAR COUN- T E R C O L O C K W I S E INCREASES SPRING TENSION AND E N GIN E RPM. ROTATING ADJUSTING COL- LAR C L O C K W I S E DECREASES SPRING TENSION AND E N G I N E RPM.

4-47

“F” SERIES (Cont.) F 1 0 0 SERIES GOVERNOR (EARLY MODELS)

6. Insert air vane through slot in shroud mounting base and secure carburetor assembly to engine. Exercise care when inserting air vane assembly so not to damage the air vane.

---___- BAFFLE REMOVED FOR CLARITY

A SAFETY WARNING DO NOT SUBSTITUTE ELECTRIC START SHROUD BASE ON MANUAL

LOW GOVERNOR AIR VANE TO O V E R S P E E D ENGINE. ENGINE

CEEDS S A F E T Y CERTIFICATION FOR THROWN OBJECTS. ANY FOREIGN OBJECT STRUCK BY THE

OUS THROWN OBJECT THAT CAN CAUSE SERIOUS INJURY. ENGINE SPEED IN EXCESS OF 3300 R.P.M. WILL ALSO SHORTEN ENGINE LIFE. GOVERNOR ADJUSTMENT SHOULD NOT EXCEED 3300 R.P.M.

START MODELS. THIS MAY AL-

SPEED ABOVE 3300 R.P.M. EX-

BLADE CAN BECOME A DANGER-

I

GOVERNOR ADJUSTMENT

Engine speed (R.P.M.) is controlled by the governor spring tension. All mowers are run and tested at the factory, however, if the governor requires adjustment proceed as follows.

1. Grasp the hex shaped adjusting collar and gently raise collar upwards until collar is above splines on speed control lever as shown.

2. Rotate adjusting collar COUNTER- CLOCKWISE to increase spring tension ,increase engine R.P.M.). Rotating collar CLOCKWISE decreases spring tension (decreasing engine R.P.M.). Reinstall ad- justing collar to speed control lever by pushing collar down in the locked po- sition.

NOTE

Each spline on the speed control lever represents 50-75 R.P.M.

3. Use a tachometer to accurately measure engine R.P.M. Correct R.P.M. is 2400- 2600 LIGHT speed setting and 3100-3300 NORMAL setting.

4. Run engine and test for correct engine R.P.M. in both LIGHT and NORMAL settings. Adjust governor spring tension as required until engine R.P.M. is within specified range.

4-48

"F" SERIES (Cont. ) F 1 0 0 SERIES GOVERNOR

GOVERNOR ASSEMBLY AND OPERATION (ROUND GOVERNOR COLLAR)

The governor air vane assembly is an in- As mowing conditions change the governor tegral component of the carburetor. The air vane responds instantly to engine run- governor air vane (part of the throttle shaft) ning demands. The function of the governor extends through a “tunnel" in the shroud air vane is to control engine speed. An alti- mounting base. As the flywheel rotates an tude adjustment needle regulates the right air flow is created against the air vane amount of fuel with the correct amount of which opens or closes the throttle shaft. incoming air.

"F" SERIES (Cont.) F 1 0 0 SERIES G O V E R N O R (DISASSEMBLY)

REMOVING AIR VANE ASSEMBLY (ROUND GOVERNOR COLLAR) 1. Remove two carburetor mounting screws USE CARE WHEN REMOVING CAR-

and remove carburetor and air vane as- BURETOR AND AIR VANE ASSEM- sembly as shown. Special care MUST BE BLY FROM ENGINE. DAMAGE TO taken when removing carburetor to pre- AIR VANE WILL CREATE AN EN- vent damaging air vane assembly. GINE OVERSPEED CONDITION.

SAFETY WARNING

AIR BAFFLE REMOVED FOR CLARITY

I

2. To release governor spring tension, rotate ad- justing collar counterclockwise until two ends of governor spring are aligned.

3. Using needle nose pliers remove throttle disc from throttle shaft as shown. Note position of throttle disc so during reas- sembly disc is installed correctly. Ex- amine throttle disc for excessive wear.

.____- ==LE REMOVED FOR CLARITY

ROUND COLLAR

4-50

(ROUND GOVERNOR COLLAR)

4.

5.

6.

7.

8.

Slide (lift) the complete governor assembly from the carburetor body.

NOTE

Do not damage or distort the governor spring during this disassembly.

Carefully remove governor spring from gover- nor adjusting collar.

Remove governor adjusting collar from the hub of air vane.

To remove or replace the speed control lever, it is necessary to first remove retainer from the carburetor body. Carefully pry it out of the holes without damaging it or the carburetor body.

Examine all components removed for damage or wear and replace as required.

SPEED

LEVER

SPEED CONTROL LEVER RETAINER

CARBURETOR ASSEMBLY

"F" SERIES (Cont.) F 1 0 0 SERIES G O V E R N O R

(ASSEMBLY ) REASSEMBLY GOVERNOR ASSEMBLY F100 SERIES (ROUND GOVERNOR COLLAR)

1. Reassemble speed control lever and retainer to carburetor if it was removed.

2. Insert long end of governor spring into square hole of speed control lever.

4. Assemble air vane and throttle shaft into car- buretor with the air vane facing towards the front and coming to rest on top of ratchet ring of governor collar.

NOTE

Do not force the ratchet ring into the governor hub.

3. Assemble speed control collar onto governor 5. Place your finger on top of hub to hold it spring with the short end of spring inserted into stationary. small square hole under flange of collar.

6. Push the ratchet ring in slightly to permit it to slide into the hub and the lower end of throttle shaft to enter the pivot hole in carburetor body.

4-52

"F" SERIES (Cont.) F 1 0 0 SERIES GOVERNOR

THROTTLE SHAFT AND DISC VALVE INSTALLATION (ROUND GOVERNOR COLLAR)

1. Insert throttle shaft into carburetor body with the notch in the air vane hub facing you. Gently attach governor spring to air vane hub.

2. Using needle nose pliers insert throttle disc into throttle shaft. Flat edge on throttle disc must be installed upwards facing. the air vane as shown. The small hole in the throttle disc must be installed facing the front of the carburetor as shown. Insert throttle disc until two half moon slots are touching throttle shaft as shown.

3. Rotate air vane and check movement of throt- tle disc. Check for binding and/or wear in car- buretor throat.

GOVERNOR ADJUSTMENT

NOTE

Always use a tachometer to accurately measure engine R.P.M. Correct R.P.M. is 2400-2600 LIGHT speed setting and 3100- 3300 NORMAL setting.

2. Run engine and test for correct engine R.P.M. in both LIGHT and NORMAL settings. Adjust governor spring tension as required until engine R.P.M. is within specified range.