North American Clutch & Driveline
Rockford, Illinois
Phone: (800) 383-9204
(815) 282-7960
Fax (815) 282-9160
www.naclutch.com
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Problem
Cause
Correction
Clutch slippage
Clutch slippage
(adjustment was
properly set)
Clutch slippage
(adjustment was
properly set)
Clutch failure (several
times)
Failed release bearing
(bronze type)
No output from PTO
(clutch feels normal)
Failed pilot bearing
Failed main bearing(s)
(repeated failures)
Failed main bearing(s)
No adjustment or improper
adjustment.
Glazed, burned or warped
mating components from
high engagements.
Clutch disc is oil or grease
soaked.
Clutch does not have torque
capacity for engine output.
Improper handle position
and/or modification.
Drive teeth worn off clutch
disc.
Bearing overloaded, lack of
lube, improper bearing for
application.
Improper application (In-line
vs. side load)
Improper lube intervals,
improper grease, incorrect
bearing setting if applicable.
Clutch pressure must be
set with spring pull scale or
torque wrench (see section
and 3.5)
Replace complete clutch
with new assembly. Engage
with engine speed less than
1000 RPM. (see section 5.0)
Check for proper grease
viscosity & lube intervals.
Replace damaged
components. (See section 3.0)
Review application. Contact
NACD.
Position handle vertically up
or down when engaged and
no pre-load. (See section 4.5)
Check for failed pilot bearing,
misalignment, and dial
indicate bell housing.
(See section 2.7)
Check for proper belt
tension, lubrication and
application. (See section and
3.0)
Review application. Contact
NACD.
Checking for proper
lubrication, review lube
intervals, set bearings to
proper clearance. (See
section and 13.0)