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 75 of 828
TM 9–2350–311–20–2
2–14
2–6
PRELIMINARY SERVICING AND ADJUSTMENT OF EQUIPMENT
2–6.1
Electrical Connections
All electrical interconnections will have an overall inspection accomplished. This is to include wiring harnesses, connec-
tors, and groundings. These are discussed in Chapter 8, Cab Electrical System.
2–6.2
Fluid and Pressure Checks
Certain checks must be accomplished before the system may be considered operational.
NOTE
Park vehicle on level ground if possible when performing this check.
a.
Cab Hydraulic Power Pack Assembly. Check hydraulic fluid level (para 6–2).
b.
Main Accumulator. Check nitrogen precharged pressure (para 6–10).
c.
Cab Traverse. Operate and check for hydraulic leaks.
d.
155 MM Cannon Tube Elevation/Depression. Operate and check for ease of operation (smooth cannon tube travel up
and down) and for hydraulic leaks (para 2–9.4). Have a crew member observe variable recoil linkage for rotation
(TM 9–2350–311–10).
e.
Projectile Rammer. Check for hydraulic leaks (para 2–9.4).
f.
Rammer. Perform reliability checks (para 7–3).
2–6.3
Cab Hydraulics
Check the cab traverse, equilibrated elevation, and rammer systems for correct operation (TM 9–2350–311–10) and for
hydraulic leaks. Adjustment procedures for the equilibrated elevation system are discussed in Chapter 6. Adjustment pro-
cedures for the projectile rammer are discussed in Chapter 7.
2–6.4
Fire Control
a.
Boresight fire control in accordance with TM 9–2350–311–10.
b.
Make sure M1A1 collimator is still illuminated.
2–6.5
Lubrication
Lubricate equipment as directed by the PMCS chart (para 2–9), TM 9–2350–311–20–1, and TM 9–2350–311–10.
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