TM 9-1290-335-35
CHAPTER 4
TROUBLESHOOTING
Section I. GENERAL
further
damage
to
a
faulty
4-1. Purpose
Troubleshooting is a systematic isolation of
component. Exercise care during
malfunctions and defective components bv means of
troubleshooting, to avoid further
symptoms and tests.
Close adherence to the
damage.
procedures covered herein will materially reduce the
time required to locate trouble and restore the
4-2. Scope
equipment to normal operation.
This chapter covers troubleshooting which is
peculiar to direct support, general support, and depot
Caution:
maintenance
operations.
For
troubleshooting
Operation of materiel without a
procedures performed BY lower categories of
preliminary examination can cause
maintenance, refer to TM 9-2350-230-12 .
Section II. TROUBLESHOOTING PROCEDURES
4-4. Procedure
4-3. General
The troubleshooting procedure described herein is
describes
the
troubleshooting
one of determining the cause of the malfunction and
procedures.
taking the necessary corrective action.
Table 4-1. Troubleshooting
Lowest
Malfunction
Probable causes
Corrective Action
maintenance
category
Gunner's aid dial does not
Tension spring broken,.
Replace tension spring.
PS
turn smoothly or does not
remain in position.
Resetter knob does not
Resetter knob spring
Replace the compression
DS
remain in normal (up)
damaged or broken.
spring (para 5-8).
position.
With resetter knob de-
Flange pin broken.
Replace flange pin
GS
pressed, upper 100 mil
pointer does not turn.
When turret is traversed
Coil spring damaged or
Replace oil spring
GS
upper 100 mil pointer
broken.
does not turn.
4-1
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