6.18
PVT System
Drive Clutch Disassembly
1. In a straight line, mark/etch the sheaves and the cover
with a black marker or a scribe.
2. Place the drive clutch in the clutch compression tool
(
PN 8700220).
3. Compress the clutch in the compression tool, then
secure the chain.
4. Evenly remove the cover fasteners. The cover
bu
shing may be damaged if the cover is side-loaded
or mis-aligned.
5. Carefully remove the
tension from the compression
tool.
6. Remove the cover and inspec
t the cover bushing.
Replace if damaged or worn.
NOTE: Replace the cover bushing if the inside
d
iameter is over 1.40 (28.95mm)
7. Remove the spring.
8. Mount the drive clutch securely in a drive clutch
hold
ing fixture (PN 2871358).
9. Remove the jam nut in a counterclockwise direction
(sta
ndard thread) using the drive clutch spider nut
socket (PN 2871358).
10. Install the spider removal tool (PN 2870341), and
rem
ove the spider in a counterclockwise direction
(standard thread).
11. Measure the total thickness of the spacer washers
th
at are installed on top of the clutch spacer. Record
the thickness of these spacer washers.
12. Inspect both sheave surfaces for wear or damage.
13. Inspect the moveable sheave bushing for wear or
dam
age.
14. Remove all three drive clutch weights.
15. Inspect each weight. The surface should be smooth,
w
ith no waves or galling. Place pin inside weight to
check flyweight bushing and pin surface for wear by
rocking the weight back and forth.
16. Inspect all the rollers, bushings and roller pins by
pulling a flat
metal rod across the roller.
17. Roller can also be inspected by rolling with a finger to
fe
el for flat spots, roughness, or loose bushing.
NOTE: The flyweight bushing is not replaceable. If
flyweight
bushing is damaged, the flyweight, pin and
nut will need to be replaced.
18. Inspect to see if the roller and bushing are separating.
19. Bushing must fit tightly in roller.
20. Replace roller and pin if roller fails
to roll smoothly (no
flat spots) or if the bushing is loose or worn.
STATIONARY SHEAVE
MOVEABLE SHEAVE
SPIDER
COVER
SPRING
JAM NUT
SPACERS
CLUTCH SPACER
BEARING SLEEVE
MOVEABLE INSERT
COVER BEARING
RETAINER
SPIDER BUTTON
WASHER
ROLLER
ROLLER PIN
SHIM
WEIGHT
WEIGHT PIN
Wear eye protection when servicing the drive clutch.
Sheaves must be marked to provide a reference point
for clutch balance and spider indexing. If the sheaves
are not marked and the spider washers are changed or
misplaced, the clutch may be out of balance and
damage to the clutch may result.
Clutch spring is under extreme tension, use caution and
wear eye protection when disassembling the clutch.
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