Troy-Bilt Models 521 - Manual (Page 9)

9
• To adjust, tip the snow thrower back so that it rests
on the handle. Loosen the four lock nuts and bolts
which secure the shave plate to the housing. See
Figure 7. Move the shave plate to desired position
and retighten the nuts and bolts securely.
Figure 7
Control Cable
As a result of both the control cable and the drive belt
stretching due to wear, periodic adjustments may be
necessary.
If the auger seems to hesitate when rotating while the
engine maintains a constant speed, an adjustment is
necessary. Proceed as follows:
The upper hole in the control handle provides for an
adjustment in cable tension. To adjust, disconnect the
end of control cable from the bottom hole in the control
handle and reinsert it in the upper hole. Test the snow
thrower to see if there is a noticeable difference.
Carburetor
• Refer to the separate engine manual, packed with
your unit, for carburetor adjustment information.
SECTION 6: MAINTAINING YOUR SNOW THROWER
Replacing Belt
• Remove the belt cover by removing five hex
screws. See Figure 8.
Figure 8
• Pull up on the idler pulley and slip the belt off the
engine pulley. See Figure 9.
Figure 9
• Reassemble new belt. Reinstall the belt cover.
Replacing Shave Plate
The shave plate is attached to the bottom of the auger
housing and is subject to wear. It should be checked
periodically. There are two wearing edges and the
shave plate can be reversed. Refer to Figure 6.
• Remove the four carriage bolts and hex lock nuts
which attach it to the snow thrower housing.
Lock Nut & Carriage Bolt
WARNING: If any adjustments need to be
made to the engine while the engine is running
(e.g. carburetor), keep clear of all moving parts.
Be careful of muffler, engine and other
surrounding heated surfaces.
WARNING: Before servicing, repairing, or
inspecting, disengage the control bail and stop
engine. Wait until all moving parts have come
to a complete stop. Disconnect spark plug wire
and ground it against the engine to prevent
unintended starting.
Hex
Screw
Hex Screw
Belt Cover
Auger
Pulley
Idler Pulley
Engine
Pulley
Drive
Belt