TM 5-3805-281-24-2
Robert Bosch Starting Motor Repair
MAKE OPEN CIRCUIT TEST FOR FIELD
WINDINGS
All four field windings are connected in parallel. Test each
winding for an open circuit.
60
10
Connect a test battery (B) to field terminal (C) and either
12
insulated brush lead (D), using a resistor (A) to limit
current draw.
Use a hacksaw blade (E) to test winding for magnetism. If
any winding is not magnetic, the winding is open circuited.
Repair or replace windings.
A--1/4-ohm Resistor
B--12-Volt Battery
NOTE: Because 1/4-ohm resistors capable of carrying
C--Field Terminal
several hundred watts are not widely available, a
D--Insulated Brush Lead
suggested alternative is to connect four 1-ohm
E--Hacksaw Blade
resistors in parallel. Each resistor should be rated
for at least 150 watts. A carbon pile can also be
used. Limit current to 40--70 amps.
There is no suitable way to check field windings for short
circuits. Winding resistance is too low to permit detection
of a short circuit.
RG,RG34710,2357
1915MAR971/1
LUBRICATION OF STARTING MOTOR
(BEFORE AND DURING ASSEMBLY)
Lubrication Point
Lubrication Instructions
Bushings ........................................................................
Soak new bushings for at least 1/2 hour before installation.
Armature shaft ...............................................................
Coat drive and commutator end journals of shaft, splines and bearing surfaces of
clutch drive with a light film of grease.
Shift Lever ......................................................................
Lubricate bearing surfaces and pivot bolts liberally with grease.
Solenoid switch ..............................................................
Coat inside of yoke and bolt threads with a light film of grease.
NOTE: Keep contacts free from grease.
RG,RG34710,2358
1915MAR971/1
