NACD 11.5 - Drive Ring Installation; Pilot Bearing Installation

North American Clutch & Driveline
Rockford, Illinois
Phone: (800) 383-9204
(815) 282-7960
Fax (815) 282-9160
www.naclutch.com
Drive Ring Installation
1.
2.
Drive ring attachment screws must be grade 8. Do not use substitutes.
Pilot Bearing Installation
FOR GREASABLE PILOT BEARING ONLY: If a pilot bearing adapter is used on the
ywheel, be sure the mating surfaces between the adapter and the ywheel 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.
Proceed as follows:
FOR GREASABLE PILOT BEARING ONLY (BEARING HAS A GREASE SHIELD ON 1
SIDE ONLY): Pack the ywheel pilot bearing cavity with grease. Install the pilot bear-
ing in the ywheel or adapter with the grease shield of a greasable bearing towards 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 ywheel to keep the pilot bearing
from going too far into the bore in the ywheel, 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 ywheel bore.
FOR NON-GREASABLE PILOT BEARING ONLY (BEARING HAS 2 GREASE SEALS):
Non-greasable, double-sealed pilot bearings require no re-lubrication and may be in-
stalled in the ywheel or adapter with either side toward the PTO and clutch. The shaft
should have no grease ttings. If it does, remove the grease tting(s) and replace with
pipe plugs as a precaution to insure grease is not forced into the pilot bearing cavity of
the ywheel. A build-up of pressure caused by forcing grease into the cavity can cause
the pilot bearing to be forced out of the ywheel, resulting in a bearing or shaft failure.
Clean the drive ring and ywheel of any dirt or debris as necessary.
Position the drive ring against the ywheel and secure with eight hex head cap-
screws. Torque the capscrews to the proper specications given in Torque Values
for Fasteners.
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