Service Manual

Single Stage Snowthrower Service Manual 5 - 29

DRIVE SYSTEMS

To replace the wheel bracket assembly on Model S-

620:

1. Drain all fuel from the fuel tank. Refer to page 2 -

2. Remove the upper shroud. After removing the

upper shroud, place the gas cap on the gas tank.

3. Remove the flange nut and cap screw at the base

of the engine support bracket refer to (Figure

129).

4. After tipping the unit forward, remove the

mounting bolts retaining the wheel brackets to the

lower handle (Refer to page 7 - 1, Figure 161).

5. Inspect all parts and replace if necessary.

Figure 129 0406-058

CHAIN DRIVE SYSTEM TROUBLESHOOTING CHART

CAUSES CORRECTIVE ACTION

ENGINE RUNS BUT PADDLES DO NOT TURN OR CHAIN JUMPING

Sprocket not aligned properly. Align sprockets. Refer to "Crankshaft Sprocket

Replacement (all models)" on page 5 - 21.

Improper chain tension.

Crankshaft and impeller sprocket damage.

Adjust chain tension.

Refer to "Crankshaft Sprocket Replacement (all

models)" on page 5 - 21 and "L.H. And R.H. (Left Hand

And Right Hand) End Cap/Bushing Replacement

(1972-1980) 14” And 21” Models" on page 5 - 22.

Note: To alleviate “icing” of drive parts, allow the unit to run until the heat generated from the engine melts any

compacted snow or ice that may have developed during operation of the unit.