North American Clutch & Driveline
Rockford, Illinois
Phone: (800) 383-9204
(815) 282-7960
Fax (815) 282-9160
www.naclutch.com
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47
CLUTCH ADJUSTMENT
Note: New power take-offs must have clutch adjustment checked before being place into
service and after the first 8-10 hours of operation. This includes any power take-offs with new
friction plates. New plates have a wear in period and clutch may require several adjustments
Before the new plates are worn in.
After wear in, clutch adjustment should be checked regularly. Heavy duty applications (rock
crushers, etc..,) which have frequent engagements, numerous engagements in an operating
day or relatively long periods of slip require more frequent readjustment than light applications.
Adjust the clutch BEFORE it overheats, does not pull, or the operating lever jumps from the
engaged position. But these symptoms are indications that clutch adjustment is required.
Adjustment measurements are made by fitting a torque wrench with a 1 ½ “socket over the
hex end located at the bottom of hand lever. Grasp only the torque wrench when making
measurements.
1. Disconnect any power engagement devices from the operation shaft if so equipped.
To Adjust The Clutch:
2. Remove the instruction cover plate (45) from the housing (44) and turn the clutch shaft until
the adjusting ring lock pin (25) can be reached.
3. Disengage the adjusting lock pin and insert a cotter pin or small nail into the hole provided
to hold it in the disengaged position. Turn the adjusting yoke (26) to the right (or clockwise
when looking at the flywheel) until the required peak torque is required at the operating shaft
(55) to engage the clutch. Refer to the Description and Specifications section of this manual for
correct peak torque.
4. Remove the cotter in or small nail. Re-engage the adjusting ring lock pin.
5. Repeat steps 3 and 4 above as necessary until the proper torque reading is obtained. Replace
the instruction cover plate and secure with two hex-head capscrews (46). Securely tighten.
