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 160 of 590

4-46

TM 9-1240-401-34&P

4-22. SEGMENT ASSEMBLY MAINTENANCE INSTRUCTIONS - continued

b. Disassembly

2

3

4

1

Using 1-1/8 and 1-9/64 inch tubular spanner

wrench, remove nut (8).

Remove bearing (9), separator (10), and bearing

(11).

Remove retaining plate (2) and mechanical felt

(12), then separate them. Discard mechanical felt.

Remove two machine screws (13) and two stops

(14) from segment (15).

b. 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.

d. Assembly

1

2

3

4

5

6

Install two stops (14) and two machine screws (13).

Lubricate new mechanical felt (12) with oil and in-

sert into retaining plate (2).

Install retaining plate (2) on segment (15).

Install bearing (11), separator (10), bearing (9), and

nut (8).

Using 1-1/8 and 1-9/64 inch tubular spanner

wrench, tighten nut (8) to preload bearing (9) and

bearing (11) to obtain free rotation without end

play.

Stake nut (8) after preloading.