Transmission Wear Metal Baselines

NAVAIR 17-15-50.4

TM 38-301-4

T.O. 33-1-37-4

CGTO 33-1-37-4

COMPONENT:

Detroit Diesel Allison

THM-3L80 (Transmission)

Lubricant:

Dextron II, III, IV

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/

Normal

Upper

Coolant Elements

Limits (PPM)\

Limits (PPM)

Aluminum

(Al)

2 To 25

50 To 75

Boron

(B)

10 To 100

200 (See Notes)

Copper

(Cu)

20 To 150

300 To 400

Iron

(Fe)

10 To 100

200

Lead

(Pb)

5 To 50

150 or higher

Magnesium

(Mg)

Molybdenum

(Mo)

Silicon

(Si)

2 To 25

Sodium

(Na)

Less Than 25

Zinc

(Zn)

600 To 900

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

M996, M996A1, M997, M997A1, M997A2, M998, M998A1, M998A2, M1025, M1025A1, M1025A2, M1026, M1026A1,

M1035, M1035A2, M1036, M1037, M1038, M1038A1, M1042, M1043, M1043A2, M1044, M1046, M1069, M1097,

M1097A2, M1109, M1113, M1114, M1123

B-97