TM-9-2320-273-34

TRUCK TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

DECEMBER 1980

TM-9-2320-273-34 - Page 233 of 801

TM 9-2320-273-34

7-10. Oil Pump.

On-vehicle maintenance of the oil pump is limited to pressure testing. The pressure of a

new oil pump should be a minimum of 5 psi (35 kPa) at low idle (600 rpm) and 40 psi (280 kPa) at 2000

rpm engine speed. To test proceed as follows :

a. Preparation.

(1)

put system park brake ON to prevent the vehicle from rolling.

.

(2)

Remove plug in oil pressure test port from left side of transmission case (fig. 7-51).

Figure 7-51. Test Oil Pump Pressure.

(3)

Install 1/8-in. NPT fitting with a pressure gage.

b. Test.

(1)

With system air pressure at normal operating pressure, push in the knob on the transmission

air charging valve on ratio selector.

(2)

Place transmission gear selector lever in neutral.

(3)

Start up and operate engine. (Refer to TM 9-2320-273-1 O).

(4)

Run engine for approximately 10 minutes. This will warm up the transmission oil to

approximately 100°F (38°C).

(5)

Check oil pressure at 600 rpm – should be a minimum of 5 psi (35 kpa).

(6)

Check oil pressure at 2000 rpm – should be approximately 40 psi (280 kPa).

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