TM 9-2320-272-24-4
5-60. TRANSMISSION OIL PRESSURE TESTING (Contd)
b. Main Pressure and Governor Pressure Test
WARNING
Ensure transmission-to-transfer case propeller shaft has been
removed before performing this test. If test is performed with
propeller shaft installed, wheel blocks (chocks) will not prevent
vehicle from rolling and causing injury to personnel.
Remove transmission-to-transfer case propeller shaft (para. 3-148).
1.
CAUTION
Before disconnecting transmission pressure lines, clean surrounding
surfaces and plug all openings to prevent entry of dirt or debris into
transmission. Damage will occur if dirt or debris enters transmission.
NOTE
Transmission-to-transfer case propeller shaft removal allows
transmission output shaft to rotate to build up governor oil
pressure. Upshift will not occur without governor pressure.
Have drainage container ready to catch oil.
Disconnect main pressure line (1) from adapters (2) and (5) and remove main pressure line (1).
2.
Remove adapter (5) from main pressure port (6).
3.
Disconnect governor pressure line (4) from adapters (3) and (9) and remove governor pressure line (4).
4.
NOTE
Only M936/A1/A2 vehicles are equipped with check valve.
Remove adapter (9) and check valve (8) from transmission auxiliary governor pressure port (7).
5.
Install 1/8-27 NPTF Thd pipe plug (13) in auxiliary governor pressure port (7).
6.
Connect pressure gauge and hose (12) to main pressure port (6) with 1/8-27 NPTF Thd hose
7.
fitting (11).
NOTE
Refer to TM 9-2320-272-10 for steps 8 through 28.
Start engine, check pressure port connections for leaks, and check oil.
8.
Operate engine at 625 25 rpm with transmission (10) shift lever in N (neutral) and parking brake
9.
set.
Note pressure reading on pressure gauge. If pressure is not 125 psi (802 kPa), repair trans-
10.
mission (10) as necessary.
NOTE
Do not maintain stalled condition for longer than 30-second
intervals. Transmission oil may overheat and cause transmission
damage.
Place transmission shift lever in 1-5 (drive) position.
11.
Operate engine at 1,200 25 rpm and note pressure reading on pressure gauge. If pressure is not
12.
180-205 psi (1,241-1,413 kPa), repair transmission (10) as necessary.
Stop engine and place transmission shift lever in N (neutral).
13.
Disconnect pressure gauge and hose (12) from main pressure port (6) on left side of
14.
transmission (10).
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