Part No. 430149 Form No. F121903A
Page 14 of 16
MAINTENANCE continued

17

Clear intake scr eens on housing and engine throughout use.
Inspect machine for loose bolts before starting engine.
Lubrication: Using S.A.E. 30 weight oil or
equivalent. See maintenance schedule.
Chain: See SP section below.
Lower Control Ends: Oil moving parts, such as
bail, and deflector door pivots.
Grease: Front wheel, and Ca ster(SP only).
Tire air pressure: Check a t regular intervals & maintain:
Low tire pressure will make unit hard to push and t urn.
Front tire at 30 psi. (21.1 kPa).
Rear push 16" tires at 30 psi. (21.1 kPa).
Rear SP 16" tires at 35 psi. (24.6 kPa).
Rear caster tire (SP only) at 30 psi (21.1 kPa)
Chain Adjustment: (See fig. 11)
1. Remove spar k plug wire.
2. Remove bott om drive guard.
3. Inspect chain a nd sprockets for wear, lubricat ion and
tension. Replace if badly worn or damaged. Skip to CHAIN
REPLACEMENT
4.Check chain tension. There should be no more than 0.25"
total movement when chain is flexed from top to bottom.
5. To increase chain tension, loo sen, do not remove, the bolts
that hold the bearings in place on each side and in the center
of the differential.
6. Loosen, do not remo ve, the Jam nut that locks the bolt into
the chain tensioner on each side of the differential.
7. With the bolts loose, equally tighten t he chain tensioner bolt
on both the left and right side of the differential.
8. Adjust in small increments, checking chain alignment,
tension and axle squareness between steps. Roll wheels to
check that there ar e no excessively tight areas in the chain.
Repeat adjustment steps if necessary. A slightly loose chain is
better than an over tightened one.
9. With chain pro perly adjusted securely tighten the jam nuts,
and bearing mount bolts.
10. Reinstall drive guard.
11. Reconnect spa rk plug wire.
Chain Lubrication: With machine not running, o il chain using
general purpose S.A.E. 30 weight oil ever y 25 hours or as
needed. Chain oiling hole is located on operator's left at rear
of engine base. Note: Be sure that entire length of chain is
properly oiled. Oiling only a few positions in the chain rotation
will not pro perly oil the chain.
17.3 DRIVE
Chains and Belts are normal replaceable wear items. A new
chain should not be used on worn sprockets. Sprockets
should be inspected and replaced when worn.
MAINTENANCE- SP MODELS ONLY
Brake Adjustment: As parking brake wears, the brake discs
may eventually require adjustment. To adjust, remo ve bottom
guard from engine base and tighten brake adjusting nut on
transmission. Adjust ca ble nut as required. Unit m ust free-
wheel in neutral with clutch engaged a nd brake off.
DO NOT OVER ADJUST.
Belt Adjustment: As V-belt wears, adjustments may be
required to m aintain proper clutch engagement. A djust by
tightening or by loosening clutch cable adjusting nut as
required, located on operators left near the face o f the engine
(See fig. 10). When replacing belt, see BELT REPLACEMENT.
DO NOT OVER ADJUST.
Belt Replacemment:
1. Remove impeller, follow impeller remo val instructions on
page 13.
2. Remove six screws securing blower housing.
3. Inspect for worn or dama ged pulleys. Replace if necessar y.
4. Replace worn belt.
5. Replace housing. N ote: Be sure to replace lock clip on
upper bolts in exact manner that it was originally installed.
6. Replace impeller, refer to impeller removal instructions on
page 13.
7. It may be necessary to adjust the belt engagement. See Belt
Adjustment.
Chain Replacement: (See fig. 11)
1. Remove spar k plug wire.
2. Remove bott om drive guard.
3. Inspect sprockets for wear. Replace if badly worn or dam-
aged.
4. Release chain tension. See Chain Adjustment.
5. Remove oper ators right and center axle bearings.
6. Remove old chain by sliding over the axle and out the hole
that the right axle bearing was mounted in.
7. Install new chain in the reverse order o f removal.
8. Set chain tension. See Chain Adjustment.
9. Replace botto m drive guard.
10. Replace spark plug wire.

Fig. 10