Detroit Diesel Allison XT1410-4 (Transmission)

NAVAIR 17-15-50.4

TM 38-301-4

T.O. 33-1-37-4

CGTO 33-1-37-4

COMPONENT:

Detroit Diesel Allison XT1410-4 (Transmission)

LUBRICANT: MIL-L-2104

Normal Range

0-266

0-49

0-18

0-7

0-659

0-19

0-32

0-6

0-184

0-9

267-

660-

185-

Marginal Range

50-60

19-22

8-9

20-24

33-40

10-11

328

812

226

329-

813-

227-

High Range

61-75

23-28

10-11

25-29

41-50

8-9

12-14

410

900

283

Abnormal

411+

76+

29+

12+

901+

30+

51+

10+

284+

15+

Abnormal Trend

(PPM Increase

203

in 10 hrs)

TECHNICAL INFORMATION

Increasing copper (Cu) usually indicates wear of clutch and brake

plates. Rapid initial wear is normally experienced during "break-

in" of new transmissions or newly installed clutch and brake plates.

The clutch plates are in transmission center section assembly.

Brake plates are in both the R.H. and L.H. output reduction (final

drive) assemblies. These three assemblies have a common oil

system; therefore, an oil analysis alone will not indicate where

excessive wear has occurred. This can only be determined by

careful observation and analysis of transmission and/or vehicle

performance symptoms or inspections. For this same reason,

whenever a failure has generated debris, the system including

coolers, oil lines, transmission center section and both R.H. and

L.H. output reduction assemblies must be thoroughly fllushed or

disassembled for cleaning.

When aluminum (Al) or aluminum and iron (Fe) are increasing

excessively, wear is occurring in the transmission torque converter.

When silver (Ag) or silver and iron are increasing excessively,

wear is probably occurring in the steer flywheel drive gear bushing

or the thrust washers in the low, intermediate, reverse or output

carriers. This may also indicate wear of the retainer progresses,

aluminum may also increase. Increasing silver or silver and iron

may also be the result of wear of the plated hook-type seal rings in

the converter high clutch areas.

The transmission is air-cooled; therefore, there should be no liquid-

coolant contamination problems.

APPLICABLE END ITEMS

M88A1

B-103