TM-9-2320-272-23-3
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 3 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-3 - Page 329 of 1469
MAIN PRESSURE AND GOVERNOR PRESSURE TEST - Continued
4.
Disconnect main pressure line (Figure 5, Item 6) from adapter (Figure 5, Item 7) and remove main pressure
line.
5.
Remove adapter (Figure 5, Item 7) from main pressure port (Figure 5, Item 1).
6.
Disconnect governor pressure line (Figure 5, Item 5) from adapter (Figure 5, Item 4) and remove governor
pressure line.
NOTE
Only M936/A1/A2 vehicles are equipped with check valve.
7.
Remove adapter (Figure 5, Item 4) and check valve (Figure 5, Item 3) from transmission auxiliary governor
pressure port (Figure 5, Item 2).
M7014DAA
1
7
6
5
2
3
4
Figure 5.
Main Pressure and Governor Pressure Test.
8.
Install 1/8-27 NPTF Thd pipe plug (Figure 6, Item 6) in auxiliary governor pressure port (Figure 6, Item 5).
9.
Connect pressure gauge (Figure 6, Item 3) and hose (Figure 6, Item 4) to main pressure port
(Figure 6, Item 7) with 1/8-27 NPTF Thd hose fitting (Figure 6, Item 2).
NOTE
Refer to TM 9-2320-272-10 for Steps (8) through (28).
10.
Start engine, check pressure port connections for leaks, and check oil.
11.
Operate engine at 625 ± 25 rpm with transmission (Figure 6, Item 1) shift lever in N (neutral) and parking
brake
set.
12.
Note pressure reading on pressure gauge. If pressure is not 125 psi (802 kPa), repair transmission
(Figure 6, Item 1) as necessary.
NOTE
Do not maintain stalled condition for longer than 30-second intervals. Transmission oil may
overheat and cause transmission damage.
13.
Place transmission shift lever in 1-5 (drive) position.
TM 9-2320-272-23-3
0374
0374-10
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