TM-9-2320-272-23-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-2 - Page 689 of 1417
ON-ENGINE ADJUSTMENTS
CAUTION
Do not change pump settings made during calibration.
1.
Remove nut (Figure 11, Item 4), lockwasher (Figure 11, Item 5), washer (Figure 11, Item 6), and screw
(Figure
11, Item 7) from throttle lever (Figure 11, Item 3) and fuel pump (Figure 11, Item 1). Discard lockwasher.
2.
Slide throttle lever (Figure 11, Item 3) off splined throttle shaft (Figure 11, Item 8).
3.
Turn splined throttle shaft (Figure 11, Item 8) clockwise until resting against idle adjusting screw
(Figure
11,
Item 2).
4.
Slide throttle lever (Figure 11, Item 3) on splined throttle shaft (Figure 11, Item 8) and install with screw
(Figure
11, Item 7), washer (Figure 11, Item 6), lockwasher (Figure 11, Item 5), and nut (Figure 11, Item 4).
Do not tighten nut.
5.
Prime fuel system and allow to warm up to operating temperature (TM 9-2320-272-10).
6.
Check idle speed. If idle speed is not 600 to 650 rpm, stop engine and check linkage adjustment.
7.
When idle speed is correct, stop engine and tighten nut (Figure 11, Item 4).
M7142DAA
5
6
3
7
8
4
1
2
Figure 11.
Fuel Pump Adjustments.
TM 9-2320-272-23-2
0240
0240-10
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