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 - Page 835 of 1393

REMOVAL

NOTE

Both boom rollers are removed in the same way with boom on or off the vehicle. This

procedure applies to the bottom boom roller with inner boom removed.

1.

Remove six screws (Figure 1, Item 2), lockwashers (Figure 1, Item 3), and roller (Figure 1, Item 4) from outer

boom (Figure 1, Item 1). Discard lockwashers.

2.

Thoroughly clean exterior of boom roller (Figure 1, Item 4).

3.

Remove eight screws (Figure 1, Item 5), lockwashers (Figure 1, Item 6), left and right mounting caps

(Figure

1, Item 7), and four shims (Figure 1, Item 8) from boom roller frame (Figure 1, Item 9).

Discard

lockwashers.

4.

Remove two rollers (Figure 1, Item 10) and roller shaft (Figure 1, Item 13) from frame (Figure 1, Item 9).

5.

Remove two rollers (Figure 1, Item 10) from roller shaft (Figure 1, Item 13).

6.

Using an arbor press, remove roller bearings (Figure 1, Item 11) from two rollers (Figure 1, Item 10).

7.

Remove two woodruff keys (Figure 1, Item 12) from roller shaft (Figure 1, Item 13). Discard woodruff keys.

TM 9-2320-272-23-4

0688

0688-2