TM-9-2350-311-10
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; OPERATOR’S MANUAL
NOVEMBER 1994
TM-9-2350-311-10 - Page 196 of 775
TM 9–2350–311–10
2–100
Change 3
2–10 OPERATING PROCEDURES — CONTINUED
2–10.2
Portable Instrument Panel Checkout Procedures
a.
MASTER WARNING Indicator Light
Ensure MASTER WARNING indicator light (1) goes out after the engine has run for 15 seconds. If MASTER
WARNING indicator light illuminates during operation, shift transmission shift control lever (2) into N (neutral) and set
hand throttle control lever (3) to run engine at 1000 to 1200 rpm and proceed as follows.
1
If either WATER TEMP gage (4) or TRANSMISSION OIL TEMP gage (5) reading is high and does not
return to normal after 5 minutes, stop engine and check coolant level.
2
If either ENGINE OIL PRESSURE gage (6) or TRANSMISSION OIL PRESSURE gage (7) reading is
low, stop engine and check oil level.
3
If MASTER WARNING indicator light (1) stays on, notify unit maintenance.
b.
ENGINE OIL PRESSURE Gage
CAUTION
If oil pressure is below 5 psi at idle (650 RPM) or below 30 psi at 1800 RPM, shutdown engine and check oil level.
ENGINE OIL PRESSURE gage (6) normal range is minimum of 5 psi at idle (650 RPM) and 30-50 psi at 1800 RPM and
50-70 psi at 2100 RPM (Maximum of 70 psi).
c.
TRANSMISSION OIL PRESSURE Gage
TRANSMISSION OIL PRESSURE gage (7) normal range is 18 to 45 psi at 1835 to 1900 rpm. (Minimum is 10 psi at
1000 rpm.)
d.
Indicator Lights
Two indicator lights (8) illuminate portable instrument panel (9).
e.
FUEL Gage
NOTE
Never run completely out of fuel. Injectors require full return flow for cooling.
FUEL gage (10) indicates fuel quantity available in either fuel tank. FUEL gage control switch (11) located on fixed
instrument panel (12) is used to select tank.
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