Cub Cadet SC 621 Operator's Manual page 16

Transmission
Pulley
Belt
Belt Keeper
Bracket
Idler Pulley
Bracket
Idler Pulley
Bolt and
Locknut
Six-Speed
Cable Slot
Control
Arm
Lower
Pulley Half
Figure 20
• Place the belt between the idler pulley and the belt
keeper bracket.
• Using pliers, rotate the belt keeper bracket so that it
snaps into slot on the idler bracket.
• Tighten the idler pulley bolt and lock nut half a turn.
Transmission
Belt
Crankshaft
Belt
16
• Place the belt between the two pulley halves on the
crankshaft. Make sure to route the belt inside the
belt guard pin. See Figure 21.
Upper
Pulley
Half
Tab
Belt
Guard Pin
Figure 21
When replacing the belt, do not disas-
IMPORTANT:
semble the lower pulley assembly.
Lower Pulley
Half
Figure 22
• Pinch both sides of the belt together so that the belt
is not in the pulley groove, and the lower pulley can
be pushed towards the engine. See Figure 22.
• Pivot the control arm back to its original position
and reinstall the six-speed cable into the slot. See
Figure 23.
• Check and make sure the belt is routed inside the
pulley halves and the belt guard pin.
Six-Speed
Cable Slot
Control
Arm
Figure 23
• Reinstall the bolt securing transmission to rear
mower housing.
Belt
Lower
Pulley
Half
Belt
Belt
Guard Pin