TM 55-1930-209-1 4&P-21
Table 6-1. General Support Maintenance Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3. Check for defective main bearings.
Replace main bearings (paras 6-37 thru 6-39).
Step 4. Check for scored pistons or piston liners.
Replace pistons (paras 6-31 thru 6-33) and liners (paras 6-34 thru 6-33).
7. Engine Oil Pressure is Low
Step 1. Check for restricted oil pump suction line.
Clean oil pump screen.
Step 2. Check for defective oil pump.
Repair or replace oil pump (Para 6-18).
Step 3. Check for worn connecting rod bearings.
Replace connecting rod bearings (paras 6-31 thru 6-33).
Step 4. Check for worn main bearings.
Replace main bearings (paras 6-37 thru 6-39).
Step 5. Check for defective oil pressure regulator.
Repair or replace oil pressure regulator (Para 6-18).
Step 6. Check for defective crankshaft.
Replace crankshaft (paras 6-37 thru 6-39).
8. Winch Drum Releases Slowly or Drags
Check for torque converter failure.
Repair or replace the torque converter (paras 6-45 thru 6-47).
Section IV. Variable Speed Governor
6-6
General
a.
The variable speed mechanical governor is designed to control engine idle speed, limit maximum no load speed,
and hold engine at any constant speed between idle and maximum as desired by operator.
b.
The governor is a double-weight speed limiting governor and is mounted on right front side of engine. It is driven
by a shaft that extends through end plate and keys to balance shaft gear.
6-3
