SE 'LF-PRO PELLED LOWER BELT DRIVE SERVICING

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Elvin May
5 years ago
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SE 'LF-PRO PELLED LOWER NOTE Whenever wheel height or handle height is changed,

Loosen clamp, lock drive unit in outof-drive position.

clamp screw securely. This procedure should provide the required 3/16 inch spacing.

1 SE 'LF-PRO PELLED LOWER NOTE Whenever wheel height or handle height is changed, clutch control rod and lever must be readjusted. Loosen clamp, lock drive unit in outof-drive position. Pull up clutch controlever and down on control rod as far as possible and tighten clamp securely. SAFETY WARNING: IMPROPER TIGHTENING OF CLUTCH ROD AND LEVER CONNEC- TION COULD RESULT IN LOSING CONTROL OF THE MOWER. This adjustment is performed by placing lower end of control rod into groove of clutch control lever assembly. Pull up clutch control lever and down on control rod as far as possible and tighten clamp screw securely. This procedure should provide the required 3/16 inch spacing. However, if it cannot be attained remove right rear wheel and loosen shoulder bolt and adjust axle accordingly..drive. ROLLER INSTALLATION The drive rollers must be properly installed to utilize the self-cleaning feature. Proper installation is with the vee pointing toward the wheel. SERVICE BULLETIN REFERENCES REVISED

V-Belt will ride in center of pulley. Refer to page 10-3.

2 DRIVEN IDLER DRIVE I A highriding belt such as this Can result in this DRIVEN PULLEY Idler Pin can be bent either way SLIGHTLY to change angle of pulley so V-Belt will ride in center of pulley. Refer to page If pulley is cocked either way V-Belt will wear quickly and fail SERVICE BULLETIN REFERENCES

TO REMOVE OR CHANGE BELT Remove Right Roller. Pull Drive Shaft to the left. Remove Belt.

3 SELF-PROPELLED LOWER IDLER PULLEY PIN Controls Idler Pulley angle. Can be bent either way to make Pulley perpendicular to Belt back. 86" is setting at factory. TO REMOVE OR CHANGE BELT Remove Right Roller. Pull Drive Shaft to the left. Remove Belt. Remove Engine from Housing. Slide a piece of pipe over idler pulley pin, and bend in the appropriate direction until belt locates in the center of the pulley. SERVICE BULLETIN REFERENCES 10.3

SELF-PROPELLED LOWER ASSEMBLING SUBBASE TO CRANKCASE Thoroughly clean sub-base and crankcase mating surfaces, and inspect for nicks or other damage.

Insert sub-base to crankcase screws only when properly aligned, and torque them evenly. 5.

MISALIGNED PULLEY WILL CAUSE HEAT RUIN the bearing. Grease bearing every 25 hours. MELTED PULLEY Heat from ruined sub-base bearing did this.

4 SELF-PROPELLED LOWER ASSEMBLING SUBBASE TO CRANKCASE Thoroughly clean sub-base and crankcase mating surfaces, and inspect for nicks or other damage. 2. Seat sub-base flange in crankcase recess as shown. 3. Twist sub-base until aligned to crankcase. it is properly 4. Insert sub-base to crankcase screws only when properly aligned, and torque them evenly. 5. Lubricate needle bearing through fitting on lower side of sub-base. Use Lawn-Boy A grease part no MISALIGNED PULLEY WILL CAUSE HEAT RUIN the bearing. Grease bearing every 25 hours. MELTED PULLEY Heat from ruined sub-base bearing did this. (A stuck sliding half of pulley can cause same results. V-belt will create heat from friction.) VARIABLE DRIVE PULLEY The sliding half of the pulley must move freely. Use a light FILM of Lawn-Boy A grease part no on male portion of fixed pulley SERVICE BULLETIN REFERENCES

SELF-PROPELLED LOWER NOTE Most gear failures result from improper gear mesh which can be prevented by making these two adjustments. GEAR MESH-VERTICAL It is very important to closely hold the.180 to.

Assemble new parts to the mower and measure the clearance by inserting a feeler gauge between bottom of the driveshaft and the top of the teeth in the drivegear.

5 SELF-PROPELLED LOWER NOTE Most gear failures result from improper gear mesh which can be prevented by making these two adjustments. GEAR MESH-VERTICAL It is very important to closely hold the.180 to.190 clearance between the driveshaft gear and drive gear. Assemble new parts to the mower and measure the clearance by inserting a feeler gauge between bottom of the driveshaft and the top of the teeth in the drivegear. Install shims as required to obtain proper clearance. SHIMS FOR VERTICAL CLEARANCE Use.010,,020, and.025 shims to test. Add or remove shims to obtain clearance. GEAR CLEARANCE-HORIZONTAL To adjust gear clearance of the driveshaft, loosen the left hand drive roller set screw or remove the drive roller entirely. Pull the driveshaft to the right as far as possible, and hold it there. Insert a.010 feeler gauge between the right hand roller and the nylon bushing and bearing assembly. Hold the drive roller against the feeler gauge and tighten the set screw of the right hand roller, making sure the screw engages the flat on the shaft. Tighten the left hand drive roller set screw, with the drive roller butted against the bushing and bearing assembly. This will provide..010 clearance at the bevel gear teeth..010 Shim Part No Shim Part No Shim Part No BUSHING AND BEARING INSTALLATION When assembling bushing and bearing assemblies, be sure flat side of bushing is up. SERVICE BULLETIN REFERENCES 10-5

SELF- PROPELLED LOWER LUBRICATION Hours of Operation As Req'd.

three to four "shots" of grease at zerk fitting in sub-base beneath housing. Use grease gun.

four "squirts" of oil at top of pulley bearing.

6 SELF- PROPELLED LOWER LUBRICATION Hours of Operation As Req'd. Lubrication Points Idler Pulley Bearing Clutch Linkage Driven Pulley Bearing (See Note) Drive Shaft Needle Bearings (See Note) Gears Apply three to four "shots" of grease at zerk fitting in sub-base beneath housing. Use grease gun. Lubricant Light Machine Oil Light Machine Oil Light Machine Oil Lawn-Boy "A" Grease Lawn-Boy "A" Grease Driven Pulley Bearing: Apply three to four "squirts" of oil at top of pulley bearing. Drive Shaft Needle Bearings: Unscrew grease plug from end of each drive shaft roller and apply grease in bearing grease reservoir. Replace plug and tighten until snug, repeat this process until grease appears at points A. NOTE Pulley cover must be removed for complete lubrication. To remove, release spring clips and remove cover REVISED 1977 SERVICE BULLETIN REFERENCES

SCAMP AND UTILITY MODELS SELF-PROPELLED BELT DRIVE SERVICING 4502, 4503, 8602, 8603 WITH F SERIES ENGINES

SCAMP AND UTILITY MODELS SELF-PROPELLED BELT DRIVE SERVICING 4502, 4503, 8602, 8603 WITH F SERIES ENGINES 4502, 4503, 8602, 8603 WITH F SERIES ENGINES Adjustments and servicing of the Scamp and Utility self-propelled mowers are very different from all previous models of self-propelled mowers. BEFORE ANY ADJUSTMENTS