"F" SERIES (Cont.) F100 SERIES GOVERNOR GOVERNOR ASSEMBLY AND OPERATION (EARLY MODELS BEFORE ) (HEX SHAPED, GOVERNOR COLLAR)

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Roderick Harmon
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vane assembly is an in- As mowing conditions change the governor tegral component of the carburetor.

The function of the governor extends through a "tunnel" in the shroud air vane is to control engine speed.

1 "F" SERIES (Cont.) GOVERNOR ASSEMBLY AND OPERATION (EARLY MODELS BEFORE ) (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 rungovernor 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 altimounting base. As the flywheel rotates an tude adjustment needle regulates the right air flow is created againsthe air vane amount of fuel with the correct amount of which opens or closes the throttle shaft. incoming air,

"F" SERIES (Cont.) REMOVING AIR VANE ASSEMBLY (EARLY MODELS) COLLAR) GOVERNOR SHAPED (HEX SAFETY WARNING 1.

Special care MUST BE BLY FROM ENGINE. DAMAGE TO taken when removing carburetor to pre- AIR VANE WILL CREATE AN ENvent damaging air vane assembly.

Release governor spring tension by gently raising hex shaped governor adjusting collar until collar is above ribs on speed controlever.

2 "F" SERIES (Cont.) REMOVING AIR VANE ASSEMBLY (EARLY MODELS) COLLAR) GOVERNOR SHAPED (HEX SAFETY WARNING 1. Remove two carburetor mounting screws USE CARE WHENREMOVINGCARand remove carburetor and air vane as- BURETOR AND AIR VANEASSEMsembly as shown. Special care MUST BE BLY FROM ENGINE. DAMAGE TO taken when removing carburetor to pre- AIR VANE WILL CREATE AN ENvent damaging air vane assembly. GINE OVERSPEED CONDITION. AIR BAFFLE REMOVED FOR CLARITY 2. Release governor spring tension by gently raising hex shaped governor adjusting collar until collar is above ribs on speed controlever. Rotate adjusting collar clockwise until two ends of governor spring are aligned. Lower adjusting collar lever. back onto speed control 3. Using needle nose pliers remove throttle disc from throttle shaft as shown. Note position of throttle disc so during reassembly disc is installed correctly. Examine throttle disc for excessive wear. 4-45

"F" SERIES (Cont.) (EARLY MODELS) (HEX SHAPED GOVERNOR COLLAR) 4.

Remove air vane and throttle shaft. 5. Carefully remove governor spring from governor adjusting collar. 6.

Using a wide bit screw driver, as shown, GENTLY pry upwards on hub of speed controlever until speed controlever is free of

3 "F" SERIES (Cont.) (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. 5. Carefully remove governor spring from governor adjusting collar. 6. Remove governor adjusting collar. 7. Using a wide bit screw driver, as shown, GENTLY pry upwards on hub of speed controlever until speed controlever is free of retaining lug on carburetor. Remove speed control lever, NOTE USE CAUTION WHEN PRYING UP- WARDSON THE LEVER TO PRE- VENT DAMAGING THE SPEED CONTROL LEVER. VANE CARBURETOR AIR ASSEMBLY 8. Examine all components removed for damage or wear and replace as required CONTROL LEVER THROTTLE DISC

"F" SERIES (Cont.) 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.

Using needle nose pliers insert throttle "snaps" into position. disc into throttle shaft with flat edge of disc facing up, and small hole in disc facing air fil- 2.

4 "F" SERIES (Cont.) 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. a lug or tab on the press 4. Insert air vane and throttle shaft into carbudown when installing lever until hub retor. Using needle nose pliers insert throttle "snaps" into position. disc into throttle shaft with flat edge of disc facing up, and small hole in disc facing air fil- 2. Install governor adjusting collar to speed con- ter and two raised dimples in disc facing you. trol lever with spring slot facing you. Rotate air vane and throttle shaft assembly. Assembly should move freely. 5. Preset governor spring tension by raising upward 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 controlever is in LOW SPEED position) COUNTERCLOCKWISE as illustrated. Lower adjustment collar onto speed control lever. THE SPEED CONTROL LEVER CON- TAINS SPLINES. EACH SPLINE REPRESENTS RPM. ROTAT- ING ADJUSTING COLLAR COUN- TERCOLOCKWISE INCREASES SPRING TENSION AND E N GIN E RPM. ROTATING ADJUSTING COL- LAR CLOCKWISE DECREASES SPRING TENSION AND ENGINE RPM. 4-47

START THIS MAY AL- LOW GOVERNOR AIR VANE TO OVERS PE EDENGINE.ENGINE SPEED ABOVE 3300 R.P.M. EX- CEEDS S A F E T Y CERTIFICATION FOR THROWN OBJECTS.

5 F SERIES (Cont.) (EARLY MODELS) 6. Insert air vane through slot in shroud mounting base and secure carburetor assembly to engine. Exercise care when inserting air assembly vane so not to damage the air vane BAFFLE REMOVED FOR CLARITY A SAFETY WARNING DO NOT SUBSTITUTE ELECTRIC START SHROUD BASE ON MANUAL MODELS. START THIS MAY AL- LOW GOVERNOR AIR VANE TO OVERS PE EDENGINE.ENGINE SPEED ABOVE 3300 R.P.M. EX- CEEDS S A F E T Y CERTIFICATION FOR THROWN OBJECTS. ANY FOREIGN OBJECT STRUCK BY THE BLADE CAN BECOME A DANGER- OUSTHROWN 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. 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 governorequires 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 decreasespring tension (decreasing engine R.P.M.). Reinstall adjusting collar to speed control lever by pushing collar down in the locked position. NOTE Each spline on the speed control lever represents R.P.M. 3. Use a tachometer to accurately measure engine R.P.M. Correct R.P.M. is LIGHT speed setting and 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

The air vane responds instantly to engine rungovernor air vane (part of the throttle shaft) ning demands.

6 GOVERNOR ASSEMBLY AND OPERATION (ROUND GOVERNOR COLLAR) "F" SERIES (Cont. ) 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 rungovernor 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 altimounting base. As the flywheel rotates an tude adjustment needle regulates the right air flow is created againsthe air vane amount of fuel with the correct amount of which opens or closes the throttle shaft. incoming air.

REMOVING AIR VANE ASSEMBLY (ROUND GOVERNOR COLLAR) "F" SERIES (Cont.) (DISASSEMBLY) SAFETY WARNING 1.

BURETOR AND AIR VANE ASSEMsembly as shown. Special care MUST BE BLY FROM ENGINE.

assembly. GINE OVERSPEED CONDITION. AIR BAFFLE REMOVED FOR CLARITY ==LE.

To release governor spring tension, rotate adjusting collar counterclockwise until two ends of governor

7 REMOVING AIR VANE ASSEMBLY (ROUND GOVERNOR COLLAR) "F" SERIES (Cont.) (DISASSEMBLY) SAFETY WARNING 1. Remove two carburetor mounting screws USE CARE WHEN REMOVING CARand remove carburetor and air vane as- BURETOR AND AIR VANE ASSEMsembly as shown. Special care MUST BE BLY FROM ENGINE. DAMAGE TO taken when removing carburetor to pre- AIR VANE WILL CREATE AN ENvent damaging air vane assembly. GINE OVERSPEED CONDITION. AIR BAFFLE REMOVED FOR CLARITY ==LE. - REMOVED FOR CLARITY I ROUND COLLAR 2. To release governor spring tension, rotate adjusting 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 reassembly disc is installed correctly. Examine throttle disc for excessive wear. 4-50

Remove governor adjusting collar from the hub of air vane.

8 (ROUND GOVERNOR COLLAR) 4. 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 governor 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.carefullypry it out of the holes without damaging it or the carburetor body. 8. Examine all components removed for damage or wear and replace as required. SPEED LEVER RETAINER SPEED CONTROL LEVER CARBURETOR ASSEMBLY

REASSEMBLY GOVERNOR ASSEMBLY F100 SERIES (ROUND GOVERNOR COLLAR) 1.

towards the front and coming to rest on top of ratchet ring of governor collar.

Do not force the ratchet ring into the governor hub. 3.

Place your finger on top of hub to hold it spring with the short end of spring

9 REASSEMBLY GOVERNOR ASSEMBLY F100 SERIES (ROUND GOVERNOR COLLAR) 1. Reassemble speed control lever and retainer to carburetor if it was removed. "F" SERIES (Cont.) (ASSEMBLY ) 4. Assemble air vane and throttle shaft into carburetor with the air vane facing towards the front and coming to rest on top of ratchet ring of governor collar. NOTE 2. Insert long end of governor spring into square hole of speed control lever. 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.) 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.

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.

10 "F" SERIES (Cont.) 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 beinstalledupwardsfacing. 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 throttle disc. Check for binding and/or wear in carburetor throat. GOVERNOR ADJUSTMENT NOTE Always use a tachometer to accurately measure engine R.P.M. Correct R.P.M. is LIGHT speed setting and 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.

SERVICE BULLETIN REFERENCES 17-1

SERVICE BULLETIN REFERENCES 17-1 ENGINE TEAR DOWN Engine tear down and assembly is easy if done right. Use the right tools, disassemble in correct order, and remove complete assemblies intact where possible.