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 110 of 836
TM 9-2320-272-24-4
5-18. FUEL PUMP SETUP AND CALIBRATION
THIS TASK COVERS:
a. Throttle Shaft Cover Removal
i.
Testing and Adjusting Pump Main Pressure
b. Mounting Pump to Test Stand
j.
Testing and Adjusting Fuel Pressure
c. Fuel Pump Run-In
k. Testing and Adjusting Governor Fuel
d. Testing Pump Seals for Leaks
Pressure
e. Testing Governor Cutoff RPM
l.
Checking and Adjusting Governor Weight
f.
Testing and Adjusting Throttle Leakage
Pressure
g. Testing and Adjusting Idle Speed
m. Testing and Adjusting Idle Speed
h. Checking and Adjusting Throttle Lever
(VS Governor Only)
Travel
n. Shutdown and Removal from Test Stand
INITIAL SETUP:
APPLICABLE MODELS
M939/A1
SPECIAL TOOLS
Fuel injection tester (test stand) (Appendix E,
Item 49)
Spring pack adjusting tool (Appendix E,
Item 130)
Travel template (Appendix E, Item 150)
Level and angle indicator (Appendix E, Item 66)
Shaft installation tool (Appendix E, Item 120)
Gear pump block plate (Appendix E, Item 57)
TOOLS
General mechanic’s tool kit (Appendix E,
Item 1)
Straightedge
MATERIALS/PARTS
Two drive pins (Appendix D, Item 101)
Lockwasher (Appendix D, Item 400)
Throttle shaft soft ball bearing (Appendix D,
Item 666)
Grease, GAA (Appendix C, Item 28)
Lubricating oil OE/HDO 30 (Appendix C, Item 50)
45A calibrating fluid (Appendix C, Item 13)
Sealing tape (Appendix C, Item 72)
REFERENCES (TM)
TM 9-2320-272-24P
TM 9-4910-571-12
TM 9-4910-571-12P
EQUIPMENT CONDITION
l
Fuel pump removed from vehicle (para. 4-35).
l
Fuel pump shutoff valve removed (para. 4-36 or
4-37).
a. Throttle Shaft Cover Removal
NOTE
Perform task a. only if throttle shaft cover has not been removed.
1.
Center punch each of the two drive pins (8) connecting throttle shaft cover (2) to fuel pump housing (1).
2.
Drill drive pins (8) out of throttle shaft cover (2). Discard drive pins (8).
3.
Remove nut (4), lockwasher (5), washer (6), screw (7), and throttle lever (3) from throttle shaft cover (2).
Discard lockwasher (5).
4.
Remove throttle shaft cover (2) from fuel pump housing (1).
5.
Install throttle lever (3) on fuel pump housing (1) with washer (6), new lockwasher (5), and nut (4).
5-104
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