TM-9-2320-338-10

TRUCK, CARGO, 8X8, M977A4

TECHNICAL MANUAL; OPERATOR'S MANUAL

OCTOBER 2008

TM-9-2320-338-10 - Page 363 of 1120

NOTE

Check system gauges often during vehicle operation. If gauges read oth-

er than normal, stop engine and troubleshoot problem.

6.

Check that fuel gauge (6) shows enough fuel to complete mission.

8X8

M

M

6

11

9

7

8

10

Figure 2.

CAUTION

Minimum safe operating engine oil pressure is 40 psi (2.76 bar) at 1200

rpm. If engine oil pressure gauge reads over 88 psi (6.06 bar) or lower

than 40 psi (2.76 bar) at any engine speed of 1200 rpm or higher, shut

off engine (WP 0057), and notify field level maintenance.

NOTE

With engine at idle (625-725 rpm), engine oil pressure can go as low as

15 psi (1.03 bar) or as high as 88 psi (6.06 bar).

7.

Check that engine oil pressure gauge (7) reads 40 to 88 psi (2.76 to 6.06 bar) between

1200-2100 rpm.

8.

If engine oil pressure gauge indicator (8) illuminates (red), this indicates that an engine

oil pressure fault code has been logged. Shut off engine (WP 0057), and notify field

level maintenance.

9.

Check that transmission temperature gauge (9) reads 160 to 220°F (71 to 104°C).

10. If transmission temperature indicator (10) illuminates (red), this indicates that the

transmission temperature is above 250°F (121°C), or torque converter temperature is

above 350° (177°C); park vehicle (WP 0056) and allow transmission to cool. Notify field

level maintenance upon completion of mission.

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