Service Bulletin 2-21 Replacement Of Clutch Sprocket And Clutch Driver Hub Bearings On 149-249 Models

REPLACEMENT OF CLUTCH SPROCKET AND CLUTCH DRIVER HUB BEARINGS ON 149-249 MODELS

PARTS REQUIRED:

These parts may be ordered from your distributor or our Parts Department.

INSTRUCTIONS FOR REMOVING AND REPLACING THE CLUTCH HUB INNER BEARING RACE:

1. To remove inner bearing race —
   A) Grind the inner bearing race as far as possible through its thickness, on an ordinary bench grinder.
   B) Strike the inner bearing race with a hammer and blunt chisel to crack it, then force it off the clutch hub with two heavy screw drivers.
2. To replace the inner bearing race —
   A) Place the new inner bearing race on a flat surface under the hydraulic or arbor press with lead edge on the bearing race, up.
   B) Inspect the inner race washer; if damaged, replace with a new one.
   C) Place the inner race washer on the clutch hub smooth side out. Use small dab of soft grease on back side to hold washer in position.
   D) Place the clutch hub squarely over the inner bearing race.
   E) Locate the hydraulic or arbor press ram in the center of the clutch hub and press hub into the inner race bearing against the inner race washer so the washer is held firmly and will not turn. CAUTION: Do not press against ends of clutch spring studs or rest ends of studs on flat surface and press inner bearing on the clutch hub. The brazing at the studs is apt to break loose.

INSTRUCTIONS FOR REMOVING AND REPLACING THE CLUTCH SPROCKET OUTER BEARING RACE:

The original outer bearing race may be removed and a new one installed in one operation with a hydraulic or arbor press.
A) Place the clutch sprocket on a flat surface under the arbor press with the inside up.
B) Place the new outer bearing race squarely over the original outer bearing race, with the lead edge on the new bearing race, facing down.
C) Place a flat piece of steel on the new bearing race and press the original race out and the new race in place with one operation.

INSTRUCTIONS FOR ASSEMBLING THE CLUTCH SPROCKET, CLUTCH HUB AND BEARING ASSEMBLY:

1. Insert ball bearings in bearing retainer. Use small amount of soft grease to hold ball bearings in position.
2. Place retainer with bearings on the clutch hub.
3. Place clutch sprocket on clutch hub and bearing.
4. Drop hub flange lockwasher into center of clutch sprocket with the outer edge lock clip pointing up. Use new lockwasher or be sure the original one is flat at point where it was bent into clutch hub keyway.
   A) Screw the clutch sprocket and hub backing flange into the clutch hub. The threads in this flange are left hand, so turn it counterclockwise to tighten.
   B) Turn the backing flange down until it just touches the bent-up clip on the hub flange lockwasher.
   C) Line up the clip with the slot in the backing flange.
   D) Turn the flange slowly until you are sure the clip is in the slot and rotating with the flange.
   E) When you are sure the clip is in position and rotating with the flange, tighten it, securing in place with Tool #150115 – Hub Flange and Countershaft Nut wrench.
   
   NOTE: Be sure the lockwasher is “centered” so that it does not touch the transmission mainshaft when the complete assembly is placed on the mainshaft taper.
   
   F) Cut the inner edge of the lockwasher at the hub keyway with a sharp chisel and bend down to complete the locking arrangement, and the clutch sprocket hub and bearing assembly is ready to put on the transmission.

Walter Brown
Service Manager