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 TM 55-1905-223-24-2
Table 2-2. Unit Maintenance Troubleshooting
Malfunction
Test or Inspection
Corrective Action
1.
Gearbox oil temperature exceeds 212 (normal range is 175-195 )
F
F
STEP 1. Check for cold oil.
Run gearbox up to operating level (see TM 55-1905-223-10).
STEP 2. Check for too much oil in gearbox.
Remove oil down to high mark on dipstick (PMCS, Item 1).
STEP 3. Check to see if oil cooler is fouled.
Clean or replace oil cooler (see para. 2-17).
STEP 4. Check to see if rate of flow through cooler is too low.
Set correct rate of water flow (see TM 55-1905-223-10).
STEP 5. Check to see if oil is unsuitable.
Check viscosity. Change oil if necessary (PMCS, Item 9).
STEP 6. Check to see if gearbox is overloaded.
Reduce engine speed (seeTm 55-1905-223-10).
STEP 7. Check to see if sensor is faulty.
Check sensor by replacement with a new one. Check rating, 2120F.
2.
Operating pressure too low or keeps changing (normal range is 260-280 psi).
STEP 1. Check to see if oil level is low.
Top off oil; locate cause for loss of oil (PMCS, Item 1).
STEP 2. Check to see if operating pressure is low on account of normal wear.
Adjust operating pressure (see TM 55-1905-223-10).
STEP 3. Check to see if filter is blocked.
Clean filter (PMCS, Item 6).
STEP 4. Check for leaking seals or preformed packings on air side of control valve.
Change seals and packings (see para. 3-9).
STEP 5. Check to see if control valve is defective.
Replace control valve (see para. 2-20).
STEP 6. Check to see if control valve is not correctly positioned.
Adjust remote controls (see TM 55-1905-223-10).
2-10
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