Snapper 555M - Manual (Page 29)

28
Service
SHEAR PIN REPLACEMENT
Under most circumstances, if the auger strikes an object
which could cause damage to the unit, the shear pin will
break. (This protects the gear box and other parts from
damage.)
The shear pins are located on the auger shaft as shown
in Figure 32. To replace the shear pins, tap out broken
pin with a pin punch, and install a new shear pin and cot-
ter pin. Spread the legs of the new cotter pin fully. Do
NOT replace shear pins with anything other than the
correct grade replacement shear pin. See the
REPLACEMENT PARTS section at the back of this man-
ual for the correct part numbers. (Use of bolts, screws or
a harder shear pin will lead to damaged equipment.)
Figure 31. Roller Chain Master Link
Keeper link
(Must install towards wheel side
with open end trailing.)
Master link
Direction of travel
ROLLER CHAIN REPLACEMENT
NOTE: This procedure does not apply to models that use
an “endless” chain.
1. Remove gas from fuel tank and run engine until it
stops running from lack of fuel.
2. Disconnect spark plug wire and fasten it away from
the spark plug.
3. Tilt the snowthrower forward and carefully rest unit
on the auger end.
4. Rotate the wheel to locate the roller chain master link.
5. Remove the keeper link, master link and chain.
6. Install new chain and master link as shown in Figure
31.
7. Return snowthrower to upright operating position.
8. Connect spark plug wire and fill fuel tank.
WARNING
Do not go near the discharge chute or auger
when the engine is running. Do not run the engine
with any cover or guard removed.
Figure 32. Shear Pin Replacement
A. Shear Pin
B. Cotter Pin
A
B
A
B