Drive Chain Adjustment; To Remove Variable-Speed Drive Belt; Variable-Speed Drive Belt Adjustment - AMF SKI-DADDLER Parts And Service Manual

SERVICE
AND
REPAIR
Drive Chain Adjustment
A properly adjusted drive chain (figure 5) should
have a 1/8- to 1/4-inch slack. Check and adjust
chain as follows:
• Remove the locknut securing the chain cover top
and remove chain cover top.
• Rotate the upper sprocket to tension one side of
the chain and then check the opposite side for proper
slack. If adjustment is required, loosen the screws
(1) securing the cam uprights (2) on each side.
• Rotate the cam (3) counterclockwise to tighten
or until the chain is properly tensioned. Hold the
cam in this position while tightening the cam upright
bolts (1) on each side. Be certain the lateral align-
ment between the drive clutch and the driven clutch
(4) is maintained while the cam upright bolts are
tightened.
• Recheck chain tension before replacing the chain
case cover.
To Remove Variable-Speed Drive Selt
• Remove the drive chain. Refer to paragraph To
Remove Drive Chain.
• Remove the clutch guard assembly.
• Loosen the locknut (9, figure 5) and serrated
washer (10). During reassembly, apply 10 foot-
pounds torque to the locknut (9).
• Push the driven clutch toward the drive clutch
sufficiently to allow removal of the variable-speed
drive belt from the drive clutch.
• Remove the locknuts (7, figure 4) securing the
bearing clamps (8) and remove the bearing clamps.
During reassembly, apply 5 foot-pounds torque to
the locknuts (7).
• Lift the driven clutch (9) and drive belt clear of
the brake assembly (10) and remove the variable-
speed drive belt.
• Install replacement drive belt. Use AMF Part
No. 37172 on Model SD15P10B; AMF Part No.
1002110 on ModeISD18P21A; AMF Part No. 1002147
on Model SD18E25B; and AMF Part No. 349140n all
other models.
8
NOTE: Variable-speed drive belt installation pro-
cedures are the reverse of removal except that the
belt must first be place around the driven clutch and
then around the drive clutch. After installation, per-
form the drive chain adjustment, variable-speed
belt adjustment and the drive clutch alignment
procedures.
Variable-Speed Drive Selt Adjustment
Proper tension for a new drive belt should be ob-
tained when the clutch centers are set to the B
dimension shown in figure 6 for the applicable model
snowmobile.
A
B
C
(TORQUE) MODEL NO.
FT-LB
.240 1G-3/4
45
SD15P10B
.300 10-3/4
70
SD18P27A
.300 1G-3/4 70 SD18E27A
.300 11-1/2 70 SD18E25B
.300 10-3/4 70 SD18E20B
.300 11-1/2
90
SD18P21A
Figure 6
ENGINE
JLO 295
HIRTH 399
HIRTH 399
KOHLER 399
HIRTH 493
HIRTH 634
CLUTCH
780
910
910
910
910
1190
HOLDDOWN
NUTS
VIEW
0
Proper tension for a used dri ve belt is obtained when
opposite sides of the belt can be squeezed, between
the drive clutches, to the following dimensions as
measured between the top and bottom outside
surface of the belt.
SD15P10B
SD18P21A
SD18P27A
SD18E27A
SD18E25B
SD18E20B
2-3/4- to 3-1/4 inches
4-1/4- to 4-3/4 inches
4- to 4-1/2 inches
4- to 4-1 /2 inches
4- to 4-1/2 inches
4- to 4-1/2 inches
1002472
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