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 266 of 590

TM 9-1240-401-34&P

5.1-17 LEVEL ASSEMBLY MAINTENANCE INSTRUCTIONS - continued

c. Assembly

1

2

3

4

Using suitable pliers, bend detent tabs on level vial

covers (1 and 2) closer together or farther apart, as

required to obtain desired fit. Position level vial

covers (1 and 2) between bosses of bracket (3).

Install fire control levels (4 and 5) by sliding into

bracket (3) and into level vial covers (1 and 2).

Install eccentric bushings (6 and 7).

Install rings (8 and 9) into bracket (3) and tighten

rings snug against eccentric bushings (6 and 7)

using fabricated eccentric tool (fig. C-2, appx C).

d. Adjustment

NOTE

Install cross-level knob on M15 quadrant.

Install M15 quadrant on howitzer by

procedures described in TM 9-2350-311-20-2.

1

2

3

4

5

Level trunnions and gun tube as described in TM 9

2350-311-10.

Turn spur gear assembly (1) until correction

counters register 00 mils. Turn elevation handwheel

(2) until elevation counter registers 0000 mils.

Adjust elevation handwheel (2) to center bubble of

fire control level (3).

Loosen three screws (4) to disengage differential

spur gear (5) from spur gear shaft (6).

Rotate differential spur gear (5) to zero counter, then

tighten three screws (4).

5.1-32

Change 1