TM-9-2320-272-23-4

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

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 4 OF 5

SEPTEMBER 2012
TM-9-2320-272-23-4

  TM-9-2320-272-23-4 - Page 837 of 1393

INSTALLATION
WARNING
Solvent cleaning compound is flammable and toxic. Do not use near an open flame and
always have a fire extinguisher nearby when solvents are used. Use only in well-ventilated
places, wear protective clothing, and dispose of cleaning rags in approved container. Failure
to comply may result in damage to equipment, injury, or death to personnel.
1.
Clean all boom roller parts with solvent cleaning compound (Volume 5, WP
0819).
2.
Inspect roller bearings (Figure 2, Item 7) and rollers (Figure 2, Item 6) for pitting and scoring. Replace bearings
or rollers (Figure 2, Item 6) if pitted or scored.
3.
Inspect boom roller frame (Figure 2, Item 1) and mounting caps (Figure 2, Item 3) for cracks or damaged
threads. Replace roller frame or mounting caps if cracked or threads are damaged.
4.
Inspect roller shaft (Figure 2, Item 9) for scoring and breaks. Replace roller shaft if scored or broken.
5.
Using arbor press, install two roller bearings (Figure 2, Item 7) on rollers (Figure 2, Item 6).
6.
Install two woodruff keys (Figure 2, Item 8) in roller shaft (Figure 2, Item 9).
7.
Install two rollers (Figure 2, Item 6) with bearings (Figure 2, Item 7) on roller shaft (Figure 2, Item 9).
8.
Position rollers (Figure 2, Item 6) and shaft (Figure 2, Item 9) as an assembly in frame (Figure 2, Item 1).
9.
Position left and right mounting caps (Figure 2, Item 3) over shims (Figure 2, Item 2) on frame
(Figure
2,
Item
1).
10.
Measure clearance between mounting caps (Figure 2, Item 3) and rollers (Figure 2, Item 6). Clearance should
be 0.062 to 0.125 in. (1.6 to 3.2 mm). If clearance is more than above, remove one or more shims
(Figure
2,
Item
2). If clearance is less than allowable, add one or more shims.
11.
Install left and right mounting caps (Figure 2, Item 3) on frame (Figure 2, Item 1) with eight lockwashers
(Figure
2,
Item
4) and screws (Figure 2, Item 5).
12.
Install boom roller (Figure 2, Item 11) on outer boom (Figure 2, Item 10) with six lockwashers
(Figure
2,
Item
12) and screws (Figure 2, Item 13).
TM 9-2320-272-23-4
0688
0688-4


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