TM-9-2350-311-20-2

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS

DECEMBER 1993

TM-9-2350-311-20-2 - Page 690 of 828

TM 9–2350–311–20–2

18–20

Change 2

18–4 M145/M145A1 TELESCOPE MOUNT: SYNCHRONIZATION AND ADJUSTMENT

— CONTINUED

b.

Checking Elevation Counter

1

Bring cannon tube to zero elevation, using M1A1 gunner’s quadrant (1) (end-for-end correction applied) at

muzzle end of tube (2).

2

Place M1A1 gunner’s quadrant (1) with zero reading (end-for-end correction applied) on M145/M145A1 tele-

scope mount (5) quadrant seats (6).

3

Center bubble on M145/M145A1 telescope mount (5) cross-level vial (7).

4

Set correction counter (8) to zero, then turn elevation handwheel (9) on M145/M145A1 telescope mount (5)

until bubble in elevation level vial (10) is centered. Elevation counter (11) should read between 9999 and

0001. If elevation counter does not read between 9999 and 0001, notify support maintenance.

2

TOP SURFACE

BOTTOM SURFACE

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