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 523 of 1417
RUNOUT AND WOBBLE CHECK
NOTE
Perform Steps (1) through (3) to check for runout.
1.
Mount dial indicator and holding fixture on front gearcase cover (Figure 1, Item 2).
2.
Position dial arm on vibration damper (Figure 1, Item 1) at surface (Figure 1, Item 3) and zero-dial indicator.
3.
Using barring tool, rotate vibration damper (Figure 1, Item 1) and take reading. If reading exceeds 0.025 in.
(0.64 mm), replace vibration damper.
NOTE
•
Perform Steps (4) through (6) to check for runout.
•
Crankshaft must be kept at front or rear limit of thrust while checking vibration damper
for wobble.
4.
Using mounted dial indicator, position dial arm on vibration damper (Figure 1, Item 1) at surface
(Figure
1,
Item
4) and zero-dial indicator.
5.
Using barring tool, rotate vibration damper (Figure 1, Item 1) and take reading. If reading exceeds 0.030 in.
(0.76 mm), replace vibration damper.
6.
Remove dial indicator and fixture.
M9306DAA
3
2
4
1
Figure 1.
Vibration Dampener Runout and Wobble Check.
END OF TASK
TM 9-2320-272-23-2
0218
0218-2
Back to Top
