TM-9-2320-272-24-3
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 3 OF 4
JUNE 1998
TM-9-2320-272-24-3 - Page 81 of 799
TM 9-2320-272-24-3
4-57. FUEL INJECTION PUMP MAINTENANCE (Contd)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Perform adjustments procedure for engine models serial number
44629589 and before.
It may be necessary to cut on break-off screw for removal.
Remove safety wire (41) from protective cap (37). Discard safety wire (41).
Remove break-off screw (40), screw (39), two lockwashers (38), and protective cap (37) from manifold
pressure compensator (34). Discard lockwashers (38).
Install break-off screw (40) and screw (39) on manifold pressure compensator (34) to hold stop (42) in
position during adjustment.
Do not turn adjustment screw more than one-half turn.
Hold adjusting screw (36) and loosen locknut (35). Turn adjusting screw (36) one-half turn clockwise
and tighten locknut (35).
Remove break-off screw (40) and screw (39) from manifold pressure compensator (34). Discard
break-off screw (40).
Install protective cap (37) on manifold pressure compensator (34) with two new lockwashers (38),
new break-off screw (40), and screw (39).
Install new safety wire (41) on protective cap (37).
Remove plug (33) from governor housing (32).
Do not turn star wheel more than six clicks during adjustment.
Using screwdriver, turn star wheel (44) clockwise toward engine (43) until six clicks are heard.
Install plug (33) on governor housing (32).
Stamp governor housing (32) and engine (43) data plate with field fix FF152 to identify fuel
injection pump adjustment.
FOLLOW-ON TASKS:
Install tachometer drive (para. 4-51).
Install air fuel control (AFC) tube (para. 3-18).
Install throttle control solenoid (para. 3-46).
Prime fuel system (para. 3-22).
4-345
Back to Top
