TM-9-2350-311-20-1
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS
AUGUST 1994
TM-9-2350-311-20-1 - Page 857 of 1275
TM9-2350-311-20-1
SECTION I. TRANSMISSION AND TRANSFER ASSEMBLIES
9-1 TRANSMISSION OIL LEVEL
Cross-drive transmission is lubricated by oil. Low transmission oil level maybe caused by leakage. Source of leakage
must be determined and condition corrected to avoid damage to transmission. Notify support maintenance.
Check oil level before starting engine (TM 9-2350-311-10). After engine starts, check lubricating oil pressure; minimum
oil pressure is 10 psi (0.7 kg/sq cm) at 1000 rpm.
9-2 TRANSMISSION OIL PRESSURE CHECKS
During the following tests, observe oil pressure and oil temperature gages on portable instrument panel. Oil temperature
should be approximately 220°F (105°C) for normal operation. If oil temperature exceeds 300°F (149°C) in any tests,
engine should be stopped and cause determined. Small variations in pressure from those given in Table 9-1 do not
necessarily mean that malfunctions exist. Malfunctions will cause radical changes in pressure.
9-3 PRESSURE CHECKS
This task covers:
Pressure Checks
I INITIAL SETUP I
Tools
Equipment Conditions
General mechanic’s tool kit (item 64, Appx H)
Air intake grille opened and secured (para 11-8)
Pressure gage assembly and tube (item 23, Appx H)
Brakes applied (TM 9-2350-311-10)
Cab traversed 90° (TM 9-2350-311-10)
Personnel Required
Left and right universal joints removed (para 10-23)
Two
Tracks blocked (12- by 12-by 24-in. [30.5-by 30.5-by 61.0-
cm] wood block or equivilant under front and rear of each
References
track)
TM 9-2350-311-10
Transmission oil level checked (TM 9-2350-311-10)
Vehicle parked on level ground (TM 9-2350-311-10)
9-2
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