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 325 of 1469
TRANSMISSION OIL COOLER PRESSURE TEST - Continued
22.
Remove pipe plug (Figure 3, Item 2) from supply hose elbow (Figure 3, Item 1).
23.
Install pressure gauge (Figure 3, Item 3) and hose (Figure 3, Item 4) in supply hose elbow (Figure 3, Item 1).
WARNING
Ensure all personnel are clear from underside and front of vehicle before starting engine.
Transmission slipping into gear may cause vehicle to move. Failure to comply may result in
injury or death to personnel.
NOTE
Refer to TM 9-2320-272-10 when performing Steps (24) through (29).
24.
Set parking brake.
25.
Start engine and check oil cooler connections for leaks.
26.
Operate engine at 1,650 rpm with transmission shift lever in N (neutral) and parking brake set. Check pressure
gauge (Figure 3, Item 3) and note reading.
27.
If pressure is below 30 psi (207 kPa), check for hose or internal oil cooler leakage.
28.
If pressure exceeds 50 psi (345 kPa), check for cooler or cooler hose restriction.
29.
Stop engine and disconnect gauge (Figure 3, Item 3) and hose (Figure 3, Item 4) from supply hose elbow
(Figure 3, Item 1).
30.
Install pipe plug (Figure 3, Item 2) in elbow (Figure 3, Item 1).
TM 9-2320-272-23-3
0374
0374-6
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