Bolens 3BA サービスマニュアル

Drive Pulley

Drive Belt

Spring

NOTE:  There are two belts on this snow thrower: an 
auger belt and drive belt. It is recommended that both 
belts be replaced at the same time. 
1.  Remove the spark plug wire from spark plug and ground 

it against the engine to prevent accidental starting.

2.  Drain gasoline from the gas tank, or place a piece 

of plastic sheet underneath the gas cap to prevent 
gasoline leakage.

WARNING:  Perform belt maintenance outdoors as 
some gas may possibly leak from the carburetor even 
though you placed a sheet of plastic underneath the 
gas cap to prevent the gas cap from leaking.
3.  Remove the self-tapping screw shown in Figure 

11, and press the plastic tabs to release the belt 
cover. Pull the belt cover up and out from around the 
engine and chute assembly. Set it aside and save. 

1.  Slip the front auger belt off of the engine pulley pushing 

it forward and rolling in off of the pulley.  See Figure 12.

2.  Squeeze the auger control handle to release the 

auger brake, which is the tab that holds the belt onto 
the auger pulley. Remove the belt.

3.  Replace with new belt after replacing the drive belt. 

NOTE: Replace the drive belt before reassembling the 
new auger belt. 
1.  Tip the snow thrower up and forward so that it rests 

on the auger housing.

IMPORTANT: Remember, gas could leak from the 
carburator at this point, the gas cap should have been 
covered with plastic as previously instructed.
2.  Remove the spring that connects the transmission to 

a bolt on the engine frame. See Figure 13. 

NOTE:  It may be easier to first remove the flange lock 
nut, then use needle-nosed pliers to firmly grip spring 
and remove from bolt.
3.  Pivot the transmission forward to release pressure on 

the drive belt. Remove belt from transmission pulley.

4.  Remove the drive belt from around the engine pulley, 

and away from the unit.

5.  Place the new drive belt into the groove on the 

engine pulley. See Figure 12.

6.  Tilt the transmission forward and position the drive 

belt onto the transmission pulley.

7.  Reconnect the spring to the bolt on the engine frame and 

secure the transmission.  Reinstall the flange lock nut.

8.  Install new auger belt.
9.  Reassemble the belt cover on the snow thrower.

Plastic Tab