TM-9-2320-272-24-4

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 4 OF 4

JUNE 1998

TM-9-2320-272-24-4 - Page 126 of 836

TM 9-2320-272-24-4

5-18. FUEL PUMP SETUP AND CALIBRATION (Contd)

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

17.

Remove fuel outlet hose (10) from test stand fuel input connector (11) and fuel return connector (5).

Remove 1/2 in. (12.7 mm) flexible hose (8) from test stand lube pressure (9) and test stand lube

return (6).

Remove fuel pressure hose (14) from test stand pressure gauge outlet (13) and pump discharge

fitting (2).

Remove pump discharge fitting assembly (3) from pump fuel shutoff valve (4) and test stand fuel

input connector (12).

Remove throttle lever spring (15) from fuel pump (7).

Remove 1/4 in. (6.35 mm) manifold hose (17) from test stand manifold vacuum gauge (16) and

1/4 in. (6.35 mm) adapter on inlet adapter assembly (18).

Remove 1/2 in. (12.7 mm) inner diameter flexible hose (22) from fuel pressure control valve (23) and

adapter elbow on inlet adapter assembly (21).

Remove pump inlet adapter assembly (20) from pump inlet port (19).

Remove pump coupling insert (35) from test stand drive coupling (30).

Loosen bar clamp (34) and slide fuel pump (7) and ring and adapter bracket (31) back from test

stand drive coupling (30).

Remove fuel pump (7) from ring and adapter bracket (31) by removing four screws (32) and washers (33).

Remove nut (26), lockwasher (27), washer (28), screw (29), and throttle lever (25) from throttle lever

shaft (24).

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