Service manual

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Measurement must be taken as close to the drive
clutch flanges as possible. Be certain the driven
clutch does not open when belt is squeezed.
IMPORT ANT: Do not use antislip belt dressing.
Belt slippage is a safety feature which prevents
overstressing drive-system components.
• To adjust drive belt tenSion, loosen the locknut
(9,
figure 5) securing the clutch rod t'ensioner to
the main frame assembly.
NOTE: If the drive belt is wearing unevenly, check
alignment as described in Drive Clutch Alignment
procedures.
• Move the driven clutch (4) in the direction re-
quired to obtain proper belt tension. Hold this posi-
tion while tightening the locknut (9) to secure the
clutch rod tensioner. Be certain the washer (10)
and bar serrations are properly engaged. Apply 10
foot-pounds torque to the locknut (9).
To Remove Drive Clutch
• Remove the hood and headlight assembly. Refer
to Hood Removal and Installation.
! CAUTION:]
Always disconnect spark plug wires
before working on the engine or drive
elements.
• Remove the clutch guard assembly.
• Loosen the locknut (9, figure 5) and serrated
washer (10) securing the clutch rod tensioner (11)
to
the main frame. 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.
• To remove the drive clutch from Models SD15P-
lOB
and SD18P21A only, remove the clutch adapter
bolt and washer. If necessary, use a clutch puller
and remove the drive clutch. During reassembly,
apply 45 foot-pounds torque to the clutch adapter
bolt on Model SD15P10B only, and 90 foot-pounds
torque on Model SD18P21A. NOTE: If the clutch nut
is removed from the drive clutch used on Model
SD15P10B, reinstall the nut, apply 125 foot-pounds
torque and be certain to engage the lockplate tangs.
10 02 472 9
VICE AND REPAIR
• To remove the drive clutch from Models
SD18P27A, SD18E27A, SD18E25B and SD18E20B,
remove the clutch adapter bolt and washer, flatten
the lock plate tangs and remove the clutch nut and
lock plate. If necessary, use a clutch puller to re-
move the drive clutch. During reassembly, apply
150 foot-pounds torque to the clutch nut and then
apply 70 foot-pounds torque to the clutch bolt . Be
certain to engage the lock pl ate tangs.
• Reassembly is the reverse of removal. Perform
variable-speed drive belt adjustment and drive
clutch alignment procedures.
Drive Clutch Alignment
• Remove the hood and headlight assembly. Refer
to Hood Removal and Installation.
! CAUTI:c?~: : J
Always disconnect spark plug wires
before working on the engine or drive
elements .
• Remove the clutch guard.
• Loosen the engine holddown nuts (figure 6) se- ,
curing the engine supports to engine mount straps.
• Place a straightedge on the fixed face of the drive
clutch and move the engine until the offset between
the straightedge and the front and rear edges of the
driven clutch is set to the A dimension as shown in
figure 6. Rotate driven clutch 90-degrees and repeat
procedure.
• Tighten engine holddown nuts and recheck align-
ment. Apply 25 foot-pounds torque when tightening
the engine holddown nuts.
To Remove Driven Clutch
NOTE: The procedures required to remove the
driven clutch are the same as those described in
paragraph To Remove Variable-Speed Drive Belt.
To Remove Brake Assembly
• Remove hood and headlight assembly. Refer to
Hood Removal and Installation.
! CAUTION!
Always disconnect the sparkplugwires
before working on the engine or drive
elements.