North American Clutch & Driveline
Rockford, Illinois
Phone: (800) 383-9204
(815) 282-7960
Fax (815) 282-9160
www.naclutch.com
shaft. Add grease until the center passage is filled with grease. Be sure that the
shipping plug is removed from the pilot bearing end of the shaft.
Cross Shaft:
With a hand operated grease gun, add 1 or 2 shots of grease into each of the grease
fittings located in the PTO housing, near each end of the cross shaft.
4.4 Install the PTO on the engine.
4.4.1 Install the drive ring on the engine flywheel. Be sure that the ring is seated in the
locating bore. Use U.S.A. SAE Grade 5 bolts (or equivalent) with lock washers.
Torque the bolts (1/2”-13) to 67 to 80 ft. lbs. (91 to 108 Nm.)
Use the engine manufacturer’s torque specifications if different from above.
Some engines use metric bolts. Refer to the engine manufacturer’s torque
specifications.
4.4.2 (For greasable pilot bearing ONLY). If a pilot bearing adapter is used on the
flywheel, be sure the mating surface(s) between the adapter and the flywheel face are
sealed to prevent loss of grease from the pilot bearing grease cavity due to vacuum or
centrifugal force. Loctite® 515 or equivalent is suggested.
4.4.3 Proceed as follows:
For greasable pilot bearing ONLY: (bearing has a grease shield on 1 side only) Pack
the flywheel pilot bearing cavity with grease. Install the pilot bearing in the flywheel or
adapter with the grease shield of a greasable bearing toward the PTO and clutch. Be
sure that the pilot bearing spacer, if used, is in place. Two types of spacers may be
used. Spacers may be installed in the flywheel to keep the pilot bearing from going
too far into the bore in the flywheel, and a spacer may be used on the pilot end of the
PTO shaft between the pilot bearing and the PTO to help maintain proper pilot bearing
location in the flywheel bore.
For non-greasable pilot bearing ONLY: (bearing has 2 grease seals) Non-greasable,
double-sealed pilot bearings require no relubrication and may be installed in the
flywheel or adapter with either side toward the PTO clutch. The shaft should have no
grease fittings. If it does, remove the grease fitting(s) and replace with pipe plugs as a
precaution to insure grease is not forced into the pilot bearing cavity of the flywheel.
A build-up of pressure caused by forcing grease into the cavity can cause the pilot
bearing to be forced out of the flywheel, resulting in a bearing or shaft failure.
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