Oil Pressure Readings - TM-9-2520-249-34-P0206

TM 9-2520-249-34& P

(3) When previous operating temperature

9-3.

Oil Pressure Readings

is not known, warm up the transmission and stabilize the

Use the oil pressures listed in the test data log sheet as

oil temperature, observing the oil temperature warning

normal values in testing the transmission. Record

system. To warm the transmission, operate the engine

actual values directly below the normal values shown on

at 1800 to 2000 rpm for 3 to 8 minutes while the vehicle

the log. Slight variations from normal pressures are

brakes are applied and the transmission is in fourth

permissible.

gear. To stabilize the oil temperature, operate the

9-4.

Tests

engine at 1000 to 1500 rpm while the vehicle brakes are

a. Preliminary Instructions. When testing the

applied and the transmission is in neutral.

transmission in a vehicle, the left- and right-track drive

(4) Stop the engine and, after 3 to 5

couplings must be disconnected.

minutes, check the oil level. Add or drain oil as'

b. Oil Level Check and Warmup.

required to bring the oil level to the mid point of the

(1) Check the transmission oil level

Operating Range on the oil level indicator.

before starting the engine. The oil level must be within

(5) To establish the oil level in the

the Operating Range marks on the oil level indicator.

transmission after draining the oil, add 10 U.S. gallons

(2) Add or drain oil as required to bring

of oil. Then adjust the oil level as outlined in (1)

the oil level within the Operating Range.

through

(4), above.

CAUTION

(6) To establish the oil level in the

To avoid overfilling, check the oil level either

transmission sump, add 14 U.S. gallons of oil. Then

following operation with hot oil (over 200F

adjust the oil level as outlined in (1) through (4), above.

operating temperature) or while the oil is cold

c. Oil Pressure Tests.

and the vehicle engine has not been started

(1) All necessary oil pressure tests can be

for a period of at least 8 hours. Always

made during the functional tests outlined in d, below,

consider oil temperature when adding oil.

and in figure 9-1.

(2) Figures 9-2 and 9-3 illustrate and

NOTE

identify the transmission oil pressure check points.

Oil return to the reservoir, following operation,

Figure 9-4 illustrates the use of the oil pressure gage kit.

will vary within a given time depending upon

oil temperature at shutdown. This will result in

variation of oil level.

9-3