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 TM 55-1905-223-24-2
Table 4-1. Intermediate General Support Maintenance Troubleshooting
Malfunction
Test or Inspection
Corrective Action
1.
Gearbox oil temperature is too high (normal range is 175-1950F).
Replace anti-friction bearings (paras. 4-9, 4-11, and 4-13).
2.
Using/losing oil.
STEP 1.
Check to see if input shaft seal is leaking.
Renew shaft sealing ring (para. 4-9).
3.
Geartrain whine.
STEP 1. Check for worn or chipped gears. Inspect gear teeth for wear tha alters the original tooth shape. Inspect
t
the thrust face of gears for scores, scratches, and burrs. Tolerances are such that a gear pits, scuffs,
scores, or galls long before the gear wear becomes critical. FIGURE 4-2 (Detail) shows original tooth
shape.
Replace gears as necessary (paras. 4-8 and 4-13).
4.
Clutch does not engage (propeller shaft does not turn).
STEP 1. Check to see if clutch is not engaged. Normal indication of a blocked or otherwise impaired clutch is
smoke and/or a burned odor.
Repair clutch (paras. 4-9 and 4-11).
Section V. INTERMEDIATE GENERAL SUPPORT MAINTENANCE PROCEDURES
4-7. General. Procedures in this chapter are at general support level only. Depot level maintenance will be performed
on a case-by-case basis subject to approval and funding by NICP. During repairs inside the casings, determine if higher
level (depot) maintenance is required, or if direct unit replacement is required. Principles of operation that describe the
main reduction gear are provided in Chapter 1, Section III.
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