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 183 of 828

TM 9–2350–311–20–2
3–72
3–3
TROUBLESHOOTING — CONTINUED
e.
CAB HYDRAULIC SYSTEM — CONTINUED
(3)
HYDRAULIC FLUID OVERFLOWS FROM TOP
OF SIGHT GAGE OR CONTAMINATED CRYS-
TALS IN HYDROSCOPIC BREATHER.
INITIAL SETUP
Tools
Artillery and turret mechanic’s tool kit
(SC 5180–95–CL–A12)
Utility pail (item 7, Appx H)
Materials/Parts
Hydraulic fluid OHT (item 21, Appx D)
Equipment Condition
Cab access cover removed (para 14–11)
1.
Discharge pressure in hydraulic system (para
6–3).
2.
Check power pack gage for hydraulic fluid
level.
Is fluid level over FULL AT 0 PRESSURE mark?
Charge main accumulator
assembly nitrogen (para
19–4). If malfunction per-
sists, notify support mainte-
nance.
NOTE
A loss of nitrogen pressure in the main accumulator
assembly will affect hydraulic fluid level reading on
sight gage. Sight gage will show hydraulic fluid level to
be low. Adding hydraulic fluid to compensate for this
loss of nitrogen will result in an overflow of hydraulic
fluid from top of sight gage when system is
discharged.
A
yes
no
CONTINUED ON NEXT PAGE
POWER
PACK
GAGE
FULL AT 0 PRESSURE MARK


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