TM 1-1520-238-23
Change 1
6-200.1
6.41.
MAIN TRANSMISSION INSPECTION – continued
d. Check upper case nuts.
(1) Torque check upper case nuts to 190 INCH-POUNDS. Use torque wrench.
e. Check for leakage from input clutch.
(1) Check compressor drive adapter and seal for leakage.
(2) Leakage requiring more than 4 ounces at refill is not acceptable.
f. Check for leakage from output seal.
(1) Leakage requiring more than 4 ounces at refill is not acceptable.
g. Check for lube oil leakage from transmission housings.
(1) Replace seal if leakage rate exceeds one drop per minute (para 6.89, 6.74, and 6.75).
h. Check differential pressure indicators.
(1) If indicator button is extended, perform drive system dynamic maintenance operational check
(TM 1-1520-238-T).
i. Check for evidence of oil leakage between transmission cover and support and between support and
main housing.
CAUTION
Under no circumstances shall the cover or support be disassembled, except during depot level
maintenance, or damage to transmission may occur.
(1) If leakage is evident; allow transmission to cool to ambient temperature and retorque cover nuts (32
places), in such a sequence that nut being torqued is furthest from previously torqued nut, to 195
INCH-POUNDS.
(2) Perform drive system dynamic maintenance operational check (TM 1-1520-238-T).
(3) Recheck for evidence of oil leakage. If leakage is evident, replace transmission (para 6.101).
j. Check transmission cover, especially around oil jet areas, for cracks and oil leaks.
(1) No cracks allowed.
(2) If oil leakage is present, but no evidence of cracks can be found, fluorescent penetrant inspect suspect
areas (TM 55-1500-335-23). Use fluorescent inspection kit.
k. Recheck suspected areas on cover, flange bolt hole bosses, or flange web area using a 5 power
magnifier.
(1) If cracking or oil leakage is evident, replace transmission.
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