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 168 of 828

TM 9–2350–311–20–2

Change 2

3–57

1.

Check pressure of nitrogen charge in manual

pump accumulator assembly (para 6–9).

2.

Charge if pressure is not 75–90 psi (517–620

kPa) (para 19–3).

3.

Check to see that charge holds.

Does accumulator hold charge?

C

Replace manual elevation

pump (para 6–15). If mal-

function persists, notify

support maintenance.

Attempt to elevate and depress the system using

manual elevating hand pump.

Does cannon elevate or depress manually?

yes

no

D

Verify fault is corrected.

Continue normal opera-

tions.

CONTINUED FROM STEP B

END OF TASK

yes

no

Replace accumulator as-

sembly (manual pump)

(para 6–9).

SIDE VIEW

MANUAL ELEVATING

HAND PUMP

MAIN

ELEVATION

CONTROL

ACCUMULATOR

ASSEMBLY

(MANUAL PUMP)