CHAPTER I

S A F E T Y WARNING

DISCONNECT SPARK PLUG WIRE BEFORE SERVICING OR MAKING ADJUSTMENTS.

TRACTION CLUTCH ROD ADJUSTMENT

1. Move shifter lever into the neutral po- sition and push snow blower, it should move.

2. Move shifter lever into any of the for- ward speeds and push snow blower, it should not move.

3. If unit does not move when shifter lever is in neutral, adjust according to the following instructions.

a. Remove clevis pin from clevis on clutch rod. (Fig. 1).

b. Turn clevis to lengthen rod if unit won't move with lever in the forward (N) position. (Fig. 2.) Turnclevis to shorten rod if unit won't move when the lever is pulled back against the

FIGURE 2

back of shifter panel.. Pull directly in back of the (N) position and in back of the (3) position. (Fig. 2.)

c. With clutch rod reconnected move snow blower again. Repeat adjust- ment until you can move snow blower with shifter lever in neutral.

SHIFTER ROD ADJUSTMENT

1. Place shifter lever in the neutral posi- tion.

2. Push shifter rod end (Fig. 1) into the unit as far as it will go.

3. Move Shifter lever into the reverse po- sition.

4. Connect the shifter rod to the shifter rod end using the 1/4" carriage bolts, lock- washers, and hex nuts; making certain the head of the bolts a r e on the slotted sides of the rods. (Fig. 3.) Slide the two rods apart in opposite directions as fa r as they will go. Be certaintheedges of the two rods are parallel and tighten securely.

12-2 SERVICE BULLETIN REFERENCES

CARRIAGE BOLT

CARRIAGE BOLT

FIGURE 3

SCRAPER. BLADE ADJUSTMENT The scraper blade is adjustable to obtain a level scraping action for clean and smooth snow removal and to compensate for scraper blade wear. To adjust the scraper blade loosen the nuts securing the blade to the auger housing. Move the blade up o r down to level position and tighten nuts securely.

SKID ADJUSTMENT The skids (Fig. 4), mounted on each side of the auger housing, adjust the distance the

scraper blade is raised above the ground surface. When removing snow from a gravel o r uneven-surface, it is advisable to keep the scraper blade as high above the surface as possible to prevent possible damage to the auger. On a blacktop o r concrete surface, keep the scraper blade as close to the surface a s possible. To adjust skids, raise Snow Thrower a few inches off the ground and loosen the nuts securing the skids to the auger housing. Move skids up or down to desired position and tighten nuts securely. Adjust both skids to the same height to keep the auger level.

BELT ADJUSTMENT Traction Drive and Impeller Drive. No ad- justment required. These belts have a spring loaded idler which makes them self- adjusting. Periodically, check idler to be sure ' it is operating freely and providing tension.

If belts come off pulleys--check for loose o r misaligned pulleys; distorted o r mis- aligned idler pulleys. The idlers should hit squarely on the belts. Also, the belt fingers must be 1/16" 1/8" from belt. Refer to Chap. 11, Fig. 5 & 6.

SERVICE BULLETIN REFERENCES 12-3

CHAPTER II BELT REPLACEMENT

The belts on the LAWN-BOY Snow Blower c. Remove impeller drive belt from are specifically designed and engineered to engine pulley. provide long service. If belt replacement is required, order by part number to insure you have the right belt. Do not use substi- d. Remove traction belt from engine tute belts. pulley.

NOTE e. Loosen capscrew on belt finger. (Fig. 6.)

Belt fingers (Fig. 5 & Fig. 6) must be adjusted 1/16'' 1/8" from belt.

BELT REPLACEMENT

1. Traction Drive Belt

a. Remove belt guard.

b. Remove springs from impeller clutch idler and traction idler. (Fig. 5. )

f. Tip ,Snow Blower forward and rest unit 'on drift cutter.

"g. Remove bottom cover.

h. Remove belt from traction pulley. (Fig. 7.)

i. Remove by slipping between traction pulley and disc.

j. Replace by reversing procedure.

12-4 SERVICE BULLETIN REFERENCES

2. Impeller Drive Belt

a. Follow steps A through I of traction belt removal.

b. Remove impeller belt by slipping between traction pulley and disc.

c. Replace by reversing procedure.

CHAPTER 111 WHEEL DRIVE GEARCASE SERVICING

SAFETY WARNING

1. DISCONNECT SPARK PLUG WIRE BEFORE SERVICING OR MAKING ADJUSTMENTS.

2. Drain fuel from tank and tip Snow Blower forward and rest on drift cutting bar.

3. Remove wheels. Count spacers for proper replacement.

4. Remove bottom cover plate and trans- mission cover plate. Fig. 10.

NOTE

To facilitate removal of transmission plate, grasp the end (gear end) of the axle and pull the axle and cover plate away from unit to dislodge end of plate. Fig. 9.

5. Remove axle roll pin (Fig. 8).

SERVICE BULLETIN REFERENCES 12-5

6. Remove gears, gear and axle and interior Locate and count spacers and wash- gearcase housing plate. Fig. 10. ers for proper replacement.

! i

I

GEAR ASSEMBLY \

SIDE ASSEMBLY PLATE.

TRANSMISSION COVER PLATE

BOTTOM COVER

F I G U R E 10

CHAPTER IV TRACTION DRIVE SERVICING

1. Traction Drive Assembly Removal

To remove the traction drive assembly follow steps 1 thru 6 Chapter I11 Gear Case Disassembly; then:

a. Remove shift control linkage keys (2) and transmission arm (bell crank as- sembly) nut Fig. 11.

NOTE

Note position of spacers and washers, before removal for proper replace- ment.

c. Remove complete drive assembly Fig. 13.

SERVICE BULLETIN REFERENCES

DRIVE BEARING SHAFT

DRIVE \

BEARING

CLUTCH

SHIFT ROD

LINK

SUPPORT ARM ASSEMBLY

I TRANSMISSION ARM

(BELL CRANK) FIGURE 12

2. Drive Roller Replacement

a. Follow all steps in Traction Drive Assembly Removal.

b. Drive (use plastic or leather hammer) open end of drive (hex) shaft out of bearings Fig. 13.

NOTE

End of driveshaft may have to be ground down slightly with file o r em- ery cloth to facilitate removal. When the shaft is driven through the bear- ing, the bearing at the opposite end (gear end) will dislodge from its retainer.

c. Remove drive roller from roller hub- Fig. 12.

CHAPTER V DRIVE DISC PULLEY lMPELLER PULLEY SERVICING

To repair or replace these items the trac- 2. IMPELLER PULLEY REMOVAL tion drive assembly must be removed refer to Chapters I11 and IV. The Impeller pulley may be removed

after the drive disc pulley by:

1. DRIVE DISC PULLEY REMOVAL a. Loosen the two (2) set screws and pull pulley out on shaft until it stops

Remove the two (2) belt idler springs, at frame housing. the two (2) belts and the retainer ring on the end of the driven shaft. This will b. Loosen collar under impeller disc by allow removal of the drive disc pulley. loosening set screw See Fig. 15.

IMPELLER PULLEY

FIGURE 14

NOTE c. Place unit in "normal" upright posi-

tion and remove auger bearing grease fittings and auger bearings. Refer to Chap. VI, Fig. 19.

Remove and count Spacers forproper alignment.

d. Pull auger, gearcase, impeller and shaft from main frame housing to free impeller drive pulley and collar. See Fig. 16.

e. Augers may be replaced simply by removing the shear pins.

FIGURE 15 FIGI' i

SERVICE BULLETIN REFERENCES

CHAPTER VI

1.

2.

3.

4.

5.

AUGER GEARCASE SERVICING

Drain gearcase.

Remove gearcase plug Fig. 17.

Remove side cover plate (3 screws) and spacer Fig. 18.

Push gearcase housing towards impeller end of shaft. This will expose the bear- ing and bearing race at the front end of the shaft.

Remove bearing, bearing race, retainer ring and spacer Fig. 18.

6. Slide auger shaft out of open end of gear- case exposing the bronze bearing Fig. 18.

7. The main drive shaft may now be pushed forward through the gearcase head ex- posing the worn gear, spacer and rear bearing Fig. 18.

NOTE

When reassembling auger gearcase, the adjustment plug (Fig. 17) should be tightened until snug and back off until cotter key can be installed.

Gearcase must be filled to bottom of level fill plug (Fig. 17) with S.A.E. 30 weight oil. Remove level fill plug to fill.

SERVICE BULLETIN REFERENCES 12-9

AUGER BEARING

GREASE .AUGER FITTING SHAFT

GEARCASE I

WORM WHEEL RETAINING

BEARING

I GASKET SHEAR PIN WASHER

COVER AUGER

FIGURE 19

CHAPTER VI1 LUBRICATION AND MAINTENANCE

SAFETY WARNING

DISCONNECT SPARK PLUG WIRE BEFORE SERVICING OR MAKING ADJUSTMENTS.

DAlLY CHECK OIL

1. Remove dirt from around oil fill before removing. Check engine oil with Snow Blower on level ground and engine stopped. Add oil when needed.

2. Make general visual inspection of Snow Blower for loose o r damaged parts. Check nuts and bolts periodically to in- sure against looseness caused by vibra- tion o r rough handling Damaged parts should be repaired or replaced.

EVERY 10 OPERATING HOURS 1. Grease Automotive Wheel Bearing

Type.

Clean off grease fittings before at- taching gun.

a. Drive Gears--One fitting on left side behind wheel Fig. 20. Apply a gen- erous amount with pressure type gun.

b, Auger bearing support--two fittings, one on each end of auger shaft. (Fig. 21.) Grease until grease comes out of bearings. Wipe off excess grease. Grease with pressure type gun.

c. Snow Chute Apply grease to control sprocket and chute teeth.

2. Oil--SAE 30

a. Oil all lever pivot points and linkages.

b, Idlers.

ci Axle Bearings. (Hole in top of bear- ing.)

3. Gear case--Although the gear case is filled at the factory, be sure to check level before first use each season and periodically during the season. Keep it full to bottom of level plug hole with SAE 30 oil. Remove vent plug to fill. (Fig. 21.)

SERVICE BULLETIN REFERENCES 12-11