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Figure 1-1-Continued
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TM-9-1240-311-34 Telescope Articulated: M127 (1240-437-1254) and M127A1 (M127E1) (1240-148-8539) and Hanger Assembly (1240-906-79451) Manual
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Table 2-2. Troubleshooting--Continued
TM 9-1240-311-34
CHAPTER 2
DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
INSTRUCTIONS
Section I. REPAIR PARTS, SPECIAL TOOLS AND EQUIPMENT
2-1.
Special Tools and Equipment
2-2.
Direct
Support
and
General
Support
Special tools and equipment necessary to perform
Maintenance
operations described in this manual are listed in table 2-
Repair Parts Repair parts are listed and illustrated in TM
1. Special tool sets of a general nature are authorized by
9-1240311-34P.
Maintenance instructions contained
TA and TOE.
herein pertain only to replacement of repair parts
authorized at the direct support and general support
maintenance levels.
Table 2-1. Special Tools and Equipment
Reference
Item
FSN or
Fig.
Para.
Use
Part No.
No.
No.s
Adapter, Sealing 8-32 UNC-2
4930-107-4378
Used with gun, sealing 4931-764-8134
Dioptometer
4931-536-5557
To make optical checks when removing
parallax and adjusting for sharp eyepiece
focus.
Gun Sealing Hydraulic
4931-764-8134
Used with adapter 4930-107-4378 to inject
sealing compound.
Wrench, Spanner, Adjustable,
5120-595-8996
Used to remove and replace screws 8590832
Pin Type
and 8624629, retainer 10533426, and studs
8624623 and 8624624.
Section II. TROUBLESHOOTING
Troubleshooting  performed  by  lower  levels
of
2-3.
General
maintenance are listed in TM 9-2350-230-12.
Troubleshooting is a systematic means of determining by
symptoms,  malfunctions  within  the  instrument.
2-4.
Procedure
Adherence to procedures covered herein will materially
reduce the time required to locate trouble and restore the
Table 2-2 lists troubleshooting peculiar to direct support
instrument to normal operation.
and general support maintenance levels.
Table 2-2. Troubleshooting
Malfunction
Probable Cause
Corrective Action
a. Replace spring (9, fig. 3-2).
Headrest is not held in secured position
a. Plunger not securing headrest.
when placed in bracket.
b. Check support (4, fig. 3-2),
b. Support on headrest not alined with plunger.
straight en if bent
Change 1 2-1

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