Johnson Service Bulletin SB-840 - Pinion Bearing Puller

April 28, 1961. Instructions for using puller 378445 on 40, 50 and 75 H.P. outboard gearcases.

Johnson Motors Service Bulletin letterhead
April 28, 1961
Bulletin No. SB-840 Gearcase
SUBJECT: Pulling pinion bearings with puller #378445; 40, 50 & 75 h.p. (See special instructions for 50 & 75 h.p. engines on page 2).
Figures 1 and 2: pinion bearing puller components and assembly

40 H.P.: 1. Place the bridge across the gearcase so the bridge’s hole is in line with the center of the pinion bearings.

2. Place the puller’s thrust bearing on the puller body by slipping it over the threaded end of the body, figure 2.

3. Screw the puller nut on the puller body so the top of the nut is approximately 1/4 inch below the bottom of the slots in the puller body, figure 2. Insert the machined end of the puller body thru the hole in the bridge and seat the body in the pinion bearing, figure 2.

4. Insert one puller jaw (#308093) thru the center of the puller body, and hook the upper notch into the narrow slot at the top of the body. a. Insert remaining jaw 308093 and hook the upper notch in the wide slot of the puller body, figure 3.

5. Insert the mandrel into the puller body, locating the puller jaws in the grooves of the mandrel. Gently push the mandrel until the mandrel’s cross-rod rests on top of the puller jaws, figure 3. WARNING!!! Do not force the mandrel. If any difficulty is encountered in inserting the mandrel, recheck the positions of both the puller body and puller jaws as outlined in steps 3 and 4.

6. Hold the mandrel’s handle (cross-rod) to prevent the puller body from turning; then turn the puller nut clockwise to remove bearings. (See figure 4 for relative positions of bearings on puller after removal.)

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SB-840 Page 2
Figures 3, 4 and 5: puller jaws, bearing assembly and fore-aft alignment

50 H.P.: Before placing the bridge on the gearcase, insert adapter sleeve #308097 into the lower bearing; then proceed as instructed for the 40 h.p. engine using puller jaws #308094. (NOTE: The adapter sleeve is used merely to prevent the needles from falling out of the bearing while it is being pulled.)

75 H.P.: Place the bridge on the gearcase and proceed as instructed for the 40 h.p. engine using puller jaws 308095. NOTE: When pulling the bearings on 75 h.p. engines, the puller jaws must be aligned fore and aft because there are side obstructions in the gearcase, figure 5.

The function of the mandrel is to lock the puller jaws in position. If any undue resistance is experienced when inserting the mandrel into the puller body, it indicates (1) the wrong jaws are being used, (2) the jaws are not properly aligned, and/or (3) the bearings were improperly installed. NEVER FORCE THE MANDREL!

JOHNSON MOTORS
W. W. DeWees Service Department
WWD:eb NOTE: Post on your RD (40 h.p.), V-50 & V-75 indexes.

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