TM-9-2520-234-35
POWER TRAIN ASSEMBLY; ALLISON MODEL XTG411-2A
TECHNICAL MANUAL; FIELD AND DEPOT MAINTENANCE MANUAL
JULY 1962
TM-9-2520-234-35 - Page 100 of 323
CHAP 4, SEC II
TROUBLESHOOTING PROCEDURES
PAR 65-69
c . Operating Instructions. Refer to
the applicable TM-10 manual for instruc-
tions on operating the transmission while
driving the vehicle in which it is installed.
d. Oil Supply.
supply information.
Refer to par. 6 for oil
e . Power Train Adjustments. Refer
to par. 234 for adjustment procedures.
f . Oil Pressures. Refer to TABU -
LATED DATA
in par. 7 for the power
train oil pressure schedule.
66. TROUBLESHOOTING – BEFORE
REMOVAL OR OPERATION
a . Do not operate the vehicle prior
to completing the procedures described in
this paragraph. Refer to par. 63, above,
for the purpose of these inspections. In -
spect for oil leakage. Visually inspect all
split lines, connections, valve bodies, and
plugs for oil leaks.
Oil leakage at split
lines may be caused by loose mounting
bolts or defective gaskets. Tighten all
bolts where leakage is found. If mounting
bolts are tight and oil continues to leak,
install a new gasket.
Note : Inspect power train again
for oil leakage after starting the
vehicle engine. Refer to par. 67,
below.
b . Inspect the power train for loose
components and linkage .
Inspect fo r
damaged or broken external components.
Check for the proper operation of steer,
range selector and brake controls before
starting the vehicle engine. Refer to par.
234.
67.
66,
TROUBLESHOOTING – BEFORE
REMOVAL AND DURING
OPERATION
a . General. If the inspection in par.
above, does not reveal the cause of
the failure, and the vehicle is operable,
further troubleshooting is necessary. Do
not remove the power train from the ve-
hicle until the causes of trouble, listed in
Table IV, TROUBLESHOOTING, below,
are checked. Refer to par. 63, above, for
the purpose and scope of these trouble-
shooting procedures. In order to make a
thorough test of the power train while it
is mounted in the vehicle, be sure that the
engine is properly tuned and that the oil
level in the power train is correct (refer
to par. 6).
Inspect again for oil leaks
after starting the engine.
b . Troubleshooting Table. This trou-
bleshooting information will assist mech-
anics in diagnosing and correcting power
train malfunctions. Use Table IV, TROU-
BLESHOOTING, below, in conjunction with
pars. 233 and 234, TESTS AND ADJUST-
MENTS. In Table IV, the letters shown
opposite the malfunction indicate the
probable causes of trouble in the order in
which they should be checked. The in-
structions in the last column are to be
followed in correcting the malfunction.
68. TROUBLESHOOTING TESTS
All of the test prescribed after re-
build may be applied to a power train in
which a malfunction is suspected (par.
233).
69. TROUBLESHOOTING
-
POWE R
TRAIN REMOVED FROM VEHICLE
When the malfunction of a power train is
not ascertained by tests before removal
from the vehicle, the power train should
be mounted in a test stand and checked.
Refer to pars. 233 and 234. Particular
attention should be given to correct ad-
justment and proper oil level in every
power train test.
70 Change 2
Back to Top
