18” CHIPPER TWIN DISC, INC.
PTO/CLUTCH
66
• The preferred method of checking the
force required to engage the clutch is
using a torque wrench to check the foot-
pounds required to engage the clutch.
The torque wrench should be used at the
cross shaft to measure engagement force.
For the clutch used in this machine, the
reading should be between 108-115 ft-
lbs. The clutch should ENGAGE within
this torque reading range. An adapter,
Twin Disc, Inc. part number 02036484,
may be obtained to provide a
• 1 1/2" hex nut at the end of the cross
shaft. The adapter may be used in place
of the standard handle for the purpose of
checking clutch adjustment with a torque
wrench or it may be installed on the end
of the cross shaft. (Most PTOs have
serrations on both ends of the cross
shaft.) Another method for checking
engagement force is the spring scale
method, which is covered in the
PTO/Clutch manual.
CLUTCH ADJUSTMENT PROCEDURE
• If the clutch requires adjustment, remove
the PTO nameplate and disengage the
clutch. Push the adjustment lock pin in
and rotate the adjustment ring. Rotate
the adjusting ring clockwise to tighten
the clutch. (Rotating the adjusting ring
counter-clockwise will further loosen the
clutch.) Check with the torque wrench,
as described earlier, and continue to
adjust until the handle engagement force
is within the range of 108-115 ft-lbs.
When clutch is properly adjusted,
replace the PTO nameplate.
CHECK ENGAGEMENT FORCE AT EITHER
END OF THE CROSS-SHAFT
REMOVE NAMEPLATE
ADJUSTING RING NOTCH
ADJUSTMENT LOCK
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