Service Manual

DRIVE SYSTEMS
5 - 20 Single Stage Snowthrower Service Manual
Chain Adjustment Procedure (all models)
Proper chain adjustment is critical to all 14” and 21”
single stage snowthrowers. If the chain is too slack or
misaligned, the teeth of the impeller sprocket can
shear. Also, if the chain is loose, the stripper assembly
can break. If the chain is too tight, the drive system
can bind, or potentially, break the crankshaft. When
properly adjusted, the chain should be snug, with not
more than 1/8 inch deflection or slack. If an adjustment
is necessary, proceed with the following:
1. Drain the fuel from the fuel tank. Refer to
"Draining The Fuel Tank" on page 2 - 5. Complete
step 1.
2. Remove the chain guard from the left side of the
unit.
3. Remove the upper and lower shrouds by
removing the fuel cap and mounting screws. After
removing the shrouding, reinstall the fuel cap.
Disconnect the spark plug lead wire.
4. Loosen the four engine mounting nuts on the left
side of the engine (Figure 105).
Figure 105 0217-056
5. Loosen one bolt on the starter housing located on
the right side of the engine (Figure 106).
Figure 106 0217-057
6. Pull the engine back until the chain is snug, with
no more than 1/8 inch deflection or slack (Figure
107).
Figure 107 0217-058