Bolens 521 サービスマニュアル

9

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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.

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.

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Refer to the separate engine manual, packed with 
your unit, for carburetor adjustment information.

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Remove the belt cover by removing five hex 
screws. See Figure 8.

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Pull up on the idler pulley and slip the belt off the  
engine pulley. See Figure 9.

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Reassemble new belt. Reinstall the belt cover.

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.

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Remove the four carriage bolts and hex lock nuts 
which attach it to the snow thrower housing.

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.

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.