TM 5-3825-270-23&P
FIELD MAINTENANCE
ENGINE OIL PRESSURE GAUGE READS LOW
INITIAL SETUP:
References (cont.)
Tools and Special Tools
Engine Module Replacement (WP 0128)
Tool Kit, General Mechanic's: AutomotiveTool Kit,
Field Level Preventive Maintenance Checks And
General Mechanic's: Automotive
Services (PMCS) (WP 0069)
Multimeter (WP 0225, Table 1, Item 4)
Oil Pressure Sending Unit And Pressure Switch
Unit Replacement (WP 0137)
Personnel Required
Water Distributor Operator Manual (TM
Construction Equipment Repairer 91L (2)
5-3825-270-10)
References
Equipment Condition
Battery Disconnect/Connection (WP 0085)
Engine OFF. (TM 5-3825-270-10)
Engine Oil Pressure Testing (WP 0122)
TROUBLESHOOTING PROCEDURE
ENGINE OIL PRESSURE GAUGE READS LOW
STEP 1
Is engine filled to appropriate level with engine oil?
Check engine oil level. (WP 0069)
CONDITION/INDICATION
Is engine filled to appropriate level with engine oil?
DECISION
No - Fill to correct level with engine oil. (WP 0069) Verify problem is solved. (Step 5 - Does engine oil pressure
gauge read normal?)
Yes - Go to step 2. (Step 2 - Does engine stall?)
STEP 2
Does engine stall?
NOTE
Water distributor is equipped with engine protection functions. If engine oil pressure is 7 psi
(48 kPa) or less at idle speed or falls below 20 psi (138 kPa) at rated speed the electronic
governor controller will command engine to shut down.
Start and observe engine for a minimum of three to five minutes. (TM 5-3825-270-10) If engine stalls, do not
turn off power to control panel.
CONDITION/INDICATION
Does engine stall?
DECISION
No - Go to step 4. (Step 4 - Does engine pass engine oil pressure test?)
Yes - Go to step 3. (Step 3 - Are less than 200 ohms measured from violet wire at engine oil pressure switch to
known good ground?)
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