Johnson Service Bulletin SB-959 - Use of #304789 Shock Absorber

Issued June 12, 1963, this bulletin explains when starter drive shock absorber #304789 is required on 28 and 40 H.P. electric starting engines, comparing Auto Lite and Delco Remy starter motors.

Johnson Motors Service Bulletin letterhead
June 12, 1963SB-959
Electrical

SUBJECT:  Use of #304789 SHOCK ABSORBER

Part #304789 Starter Drive Shock Absorber is required whenever any of the 28 or 40 H.P. Electric Starting Engines listed below are equipped with an Auto Lite electric starter motor. Part #304789 Shock Absorber is not required on these same engines, however, when the Delco Remy electric starter motor is used. Refer figures “A and B”.

Models Affected
* RX(L)-10C through 11A
* RD(L)-25D
RDS(L)-24M through 25D
RK(L)-24 through 25D

*When equipped with Electric Starting Kit.

Factory Figures A and B comparing Delco Remy starter without shock absorber and Auto Lite starter requiring #304789 shock absorber

Electric Starting Kits (Accessory) for the 28 and 40 H.P. Engines will include part #304789 shock absorber if an Auto Lite electric starter motor has been packed with the kit. If the kit has been packaged with a Delco Remy electric starter motor, part #304789 shock absorber will be omitted from the kit, since in this instance it is not required.

Sincerely,
JOHNSON MOTORS

Robert Compton
Administrative Assistant

RC:eb

NOTE:  Post on your RX-10 H.P., RD-40 H.P. and RK-40 H.P. indexes.

Historical reference

Shock absorber #304789 was required with the Auto Lite electric starter, but not the Delco Remy starter, on the listed engines.