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 404 of 775

TM 9-2350-311-10

3-4 TROUBLESHOOTING — CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ENGINE —CONTINUED

6. ENGINE HAS LOW OR NO OIL PRESSURE.

Step 1. Check engine oil level.

If engine oil level is below L (low) mark, fill as necessary (item 1, Appx G).

Step 2. Check engine compartment for evidence of oil leaks.

Notify unit maintenance if oil leaks exist.

7.

ENGINE OVERHEATS.

Step 1.

Step 2.

Step 3.

Step 4.

Step 5.

Step 6.

Step 7.

Check coolant level in radiator. Check for leaks in engine coolant tubes.

Fill radiator as necessary (para 3-5.1). If leaks are visible, notify unit maintenance.

Check engine oil level.

If engine oil level is below L (low) mark, fill as necessary (item 1, Appx G).

Check radiator cap for tight fit.

Tighten radiator cap. If replacement is necessary, notify unit maintenance.

Check cooling fan for proper operation.

If defective, notify unit maintenance.

Check radiator and grilles for blockage.

Remove blockage, if present.

Check air cleaner indicator for evidence of restrictions in air cleaner filters.

If red, clean and service air cleaner filters (para 3-5.4).

Check for prolonged period of idle at a low RPM.

If necessary, increase idle speed to 1000-1200 RPM (high idle).

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