MTD 300 series Shop Manual page 18

TRACTION DRIVE SYSTEM
NOTE: A sealed ball bearing and the outer half of the vari-
able speed pulley will come-off with it.
15. Slip the belt off of the crankshaft. See Figure 3.16.
16. Reach from under the snow thrower and pull the belt off of
the transmission pulley.
17. Lift the belt out of the snow thrower. See Figure 3.17.
18. Check the operation of the belt tensioner and variable
speed mechanism while the belt is out of the snow thrower;
See Figure 3.18.
• The moving half (outer sheave) of the variable speed pulley
should slide freely on the splines of the fixed half (inner
sheave).
• The sealed bearing between the outer sheave and the yoke
should spin smoothly.
• The idler pulley on the tensioner arm should spin smoothly.
• The tensioner arm should pivot easily.
19. Install the belt by reversing the removal process.
20. Check the speed control cable adjustment.
See: SPEED CONTROL CABLE REPLACEMENT
21. Reinstall the belt cover before testing the snow thrower.
22. Fully test the traction drive system, the speed control lever, and the auger drive system before returning the
snow thrower to service.
14
Figure 3.16
Belt
Inner sheave
Figure 3.17
Inner sheave
Outer sheave
Yoke
Bearing
Figure 3.18