TM 5-4240-501-14&P
CAUTION: DO NOT clamp motor housing in a vise or
strike with a steel hammer. Starter motors contain two
powerful magnets which can be broken or cracked if the
motor housing is deformed, dented or dropped.
Hold the armature and commutator end cap against a
work surface while sliding housing off the armature.
Note: This allows the armature to remain in the end cap
for inspection of brush contact to armature. Fig. 95.
Fig. 95 - Removing Motor Housing
Remove armature from commutator end cap.
Clean all dirt or corrosion accumulations from the
armature, end cap, motor support, etc. The bearings,
housing and armature should not be soaked in a
cleaning solution. The armature commutator may be
cleaned with a fine sand paper. Do not use emery cloth,
as emery will embed in the commutator and cause rapid
brush wear. The commutator may also be machined
with the use of a diamond cutting tool to no less than
1.23 (31.24 mm) inches outside diameter. Slots between
commutator bars should be cleaned as shown in Fig. 96
after cleaning or machining. If it is suspected that the
armature, field coil, magnets or motor housing is
defective, a new part should be tried in the motor. If
proper testing equipment is available, check the
suspected armature or field coil to determine if it is
defective (opens or grounds).
Fig. 96 - Cleaning Commutator
Briggs & Stratton- STARTERS
Gear Drive 12V & 120V
The brushes should be checked for poor seating, weak
brush springs, dirt, oil or corrosion. Brush spring
pressure should measure from 4.0 to 6.0 ounces. If
brushes are worn as shown in Fig. 97, replace. Check
to be sure brushes are not sticking in their holders. Use
holders to retain brushes and spring during assembly.
Fig. 97 - Checking Brushes
CHECKING THE BRIGGS & STRATTON RECTIFIER
CONTROL ASSEMBLY - 120 VOLT AC STARTER
MOTOR
The control assembly consists of a spring loaded switch
assembly,
cord
assembly
and
rectifier
assembly
contained in a housing assembly which is provided with
an AC three wire ground receptacle. Fig. 98. The test
procedure for checking the rectifier control assembly is
as follows:
Fig. 98 - Exploded View - Control Assembly
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