Replacing Drive Belt - Cub Cadet SC 621 Operator's Manual

SECTION 8: SERVICING YOUR MOWER

Replacing Drive Belt

• Disconnect the spark plug wire and ground it
against the engine.
• Drain the fuel tank or place a piece of plastic
beneath the cap to prevent gasoline leakage.
• Place shift lever in the first position and tip the
mower on its side.
• Remove the center bolt which secures the blade to
the crankshaft followed by blade bell support,
blade, and blade adapter.
• Move the cutting height adjustment to the highest
position.
• Remove the three hex screws holding the baffle to
the deck and pivot baffle towards the rear of the
mower. See Figure 21.
Figure 21
• Remove the hex bolt from the rear of unit holding
the transmission to the mower housing.
See Figure 22.
Cutting Height
Adjustment
NOTE: Mower is flipped on its left wheels for better access.
Figure 22
• Tilt the transmission forward and loosen the idler
pulley bolt and lock nut half a turn. See Figure 23.
• Using a pair of pliers, pull back and rotate belt
keeper bracket from the slot on the idler pulley.
Transmission
Pulley
Belt Keeper
Bracket
Idler Pulley
Bracket
Bolt and
Locknut
Baffle
• Slide the belt out from between the belt keeper
bracket and the idler pulley. See Figure 23.
Control
Arm
Hex Bolt
• Squeeze the belt together and push it forward,
while pressing the control arm inward towards the
deck. Remove the six-speed cable from the slot.
See Figure 24.
• Pivot the control arm down and away from the
pulley and the belt. See Figure 24.
• Lift off the lower pulley assembly and remove the
old belt from around the crankshaft. See Figure 25.
15
Belt
Idler
Pulley
Figure 23
Six-Speed
Belt
Cable Slot
Figure 24
Transmission