GB-20
REPLACE TRANSMISSION BELT
1. Stop the engine. Remove ignition key. Put PTO lever in
the "OFF" position. Put the shift lever in neutral.
2. Remove mower drive belt from mower clutch sheave.
Refer to Belt Replacement for your deck.
3. Remove transmission belt idler spring
(Figure 14).
4. Loosen one and remove one front engine bolt. Save
the hardware.
5. Turn the clutch bracket away from the clutch.
6. Remove old transmission belt from mower clutch
sheave and transmission sheave.
7. Install new transmission belt in the top groove of the
clutch hub and on the transmission sheave.
8. Install transmission belt idler spring to tension belt.
9. Reposition clutch bracket, replace engine bolt, and
torque both engine bolts to 17 lbf-ft (23 N•m).
10. Reinstall mower drive belt on mower clutch sheave.
CLUTCH ADJUSTMENT
If clutch fails to engage or disengage properly or begins to
make abnormal noise, check the air gap adjustment at the
three inspection slots.
To check:
1. Stop engine, remove key and wait for all hot parts to
cool.
2. Measure the air gap between the armature and the
rotor.
Minimum: A .005" feeler gauge should slide between
armature and rotor with slight contact.
Maximum: A .023" feeler gauge should slide between
armature and rotor with slight contact.
3. Repeat for each inspection slot.
To adjust:
1. If necessary, loosen gap adjustment nuts until a .005"
feeler gauge fits between armature and rotor.
2. Slide a .012" feeler gauge between armature and rotor.
3. Tighten gap adjustment nut until there is slight contact
on feeler gauge.
4. Repeat steps 1 – 3 at each inspection slot.
NOTE: Adjust air gap as evenly as possible.
5. Start unit, engage and disengage PTO.
6. Shut off unit.
7. Recheck air gap and adjust if needed.
32" AND 36" BELT REPLACEMENT
1. Stop engine, remove key and wait for all hot parts to
cool.
2. Set deck to the fourth cutting height.
WARNING: AVOID INJURY. An extension
spring, when extended, stores energy and
can be dangerous. Always use tools
specifically designed for installing or
removing an extension spring. Always
compress or extend springs slowly.
1
2
3
4
5
OG0792
Figure 14
1. Mower Drive Belt
2. Mower Clutch
Sheave
3. Transmission Belt
Idler Spring
4. Engine Bolt
5. Clutch Bracket
6. Transmission Belt
7. Transmission
Sheave
6
7
1
2
3
4
1. Armature
2. Rotor
3. Inspection Slot
4. Gap Adjustment
Nut
4
Figure 15
OG1500
Figure 16
OG1390
1
2
3
4
1. Idler Spring
2. Deck Pulley
3. Mower Clutch
Sheave
4. Belt
2
Summary of Contents for 988100
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