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 NAVAIR 17-15-50.4
TM 38-301-4
T.O. 33-1-37-4
CGTO 33-1-37-4
COMPONENT: THM-400/THM-4L80E Transmission Wear Metal Baselines
These interim wear metal guidelines are based on the manufacturer's used lubrication oil chemical analysis. The Oil Analysis
Standard Interservice System (OASIS) software will be modified to reflect actual wear metal parameters.
Wear-metal/Coolant Elements
Al
B
Cu
Fe
Pb
Mg
Mo
Si
Na
Zn
Normal
2-25
10-100
20-150
10-100
5-50
0
0
2-25
<25
600-900
Upper
50-75
200*
300-400
200
150+
50
Limits
*See notes
NOTE:
High readings of B, Mg, Mo, and Zn are usually
indications of component's lubrication additive
packages. If after establishing a base from
obtaining a sample of the servicing oil, increases
in the above mentioned elements are an
indication of coolant/water contamination. If the
component's oil sample is discolored, then
recommend the transmission oil be changed.
APPLICABLE END ITEMS
M1034A2,M1035A2M1097A2,M11133,M1114,M1123,M998A2
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