Detroit Diesel Allison XT1410-5A Transmission) (Cont)

NAVAIR 17-15-50.4

TM 38-301-4

T.O. 33-1-37-4

CGTO 33-1-37-4

The transmission center section assembly and the two output

reduction (final drive) assemblies share a common oil system with

continuous oil exchange. Therefore, an oil analysis alone cannot

indicate which of the three assemblies is encountering excessive

wear. This can only be determined by careful observation and

analysis of transmission and/or vehicle performance symptoms or

inspections. For this reason, whenever a failure has generated

debris, the system, including oil coolers, oil lines, transmission

center section and both right and left hand output reduction (final

drive) assemblies must be thoroughly flushed 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 (Fe) are increasing excessively,

wear is probably occurring in the steer flywheel drive gear bushing

(in units prior to S/N BMY0282) or the thrust washers in the low,

intermediate, reverse or output carriers. This may also indicate

wear of the converter stator retainer washer. As wear of the

retainer progresses, aluminum may also increase. Increasing silver

or silver and iron may also be the result of wear of the silver-plated

hook-type seal rings in the converter high clutch area.

The transmission oil is air-cooled.

There should be no liquid

coolant contamination problems.

B-105