TM-9-1240-401-34-P
TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
JULY 1993
TM-9-1240-401-34-P - Page 82 of 590
TM 9-1240-401-34&P
3-18. LEVEL ASSEMBLY MAINTENANCE INSTRUCTIONS (M118A3) - continued
a. Removal
1
2
3
4
Remove four machine screws (1) and four lock-
washers (2). Discard Iockwashers.
Remove level assembly (3).
Using tape, tag and disconnect wires (4) by remov-
ing two Iockwashers (5) and two nuts (6) from cir-
cuit board assembly (7). Discard lockwashers.
Remove two headless straight pins (8) only if dam-
aged.
b. Disassembly
1
2
3
4
5
6
7
Remove threaded ring (9) from mount (10).
Remove holder (11), cam (12), and level (13).
Remove two cap screws (14), two Iockwashers
(15), and mirror (16). Discard Iockwashers.
Remove two headless straight pins (17 and 18)
only if damaged.
Remove two machine screws (19), two lock-
washers (20), circuit board assembly (7), and two
sleeve spacers (21).
Using 1-25/32 and 1-51/64 inch tubular spanner
wrench, remove retainer (22), shim (23), and win-
dow (24). Discard shim.
Remove preformed packing (25) from mount (10)
and discard.
c. Repair
1 Remove corrosion, grease, and dirt from all parts.
Refer to TM 9-254 for cleaning instructions.
2 Visually inspect for missing or damaged parts.
3 Repair or replace parts in accordance with author-
ized parts listed in appendix D.
3-24
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