North American Clutch & Driveline
Rockford, Illinois
Phone: (800) 383-9204
(815) 282-7960
Fax (815) 282-9160
www.naclutch.com
3.4.3 Spring scale method with altered or special handle length
For other handle lengths, us the following formula and the values shown in the
following chart.
x = 1.15 x (A x Y)
B
3.5 Clutch Adjustment Procedure
If the clutch requires adjustment, remove the PTO nameplate, disengage the clutch and
rotate it to gain access to the adjustment lock finger.
With a screwdriver, rotate the lock pin (402) to disengage the adjustment lock finger
(401) from the splined teeth of the clutch body.
Note: Do not loosen or remove the machine screw (405). DO NOT REMOVE the lock
spring (407) OR BEND it away from the adjustment lock finger. The lock spring will be
damaged and may not fit snugly in the detent slot of the adjustment lock finger
Rotate the adjusting ring clockwise to tighten the clutch. Rotating the adjusting
ring counter-clockwise will loosen the clutch. Adjust to obtain the proper clutch
engagement force by using one of the methods described in section 3.4. (Torque
wrench method in section 3.4.1 is the preferred method.)
11
X Engagement force at attachment point
Y Engagement force at clutch release bearing
A Length of clutch release yoke
B Length of handle (cross shaft to attachment point)
lbs. force
425 lbs.
4.50”, 4.00”
inches
(newtons)
(1890 newtons)
(11.43 cm.), (10.16 cm.)
centimeters
Machine Screw (405)
DO NOT REMOVE
Lock Spring (407)
DO NOT REMOVE OR BEND
Screwdriver Slot
Screwdriver Slot
Adjustment Ring
Adjustment Lock Finger (401)
Lock Pin (402)