TM-9-2320-272-24-1

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

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4

JUNE 1998

TM-9-2320-272-24-1 - Page 826 of 1015

TM 9-2320-272-24-1

3-168. REAR AXLES SPRING SEAT WEAR PADS AND UPPER BRACKET MAINTENANCE

(Contd)

1.

Inspect spring seat wearpad (2) for cracks. Replace spring seat wearpad (2) if cracked.

2.

Inspect upper spring bracket (1) for cracks. Replace upper spring bracket (1) if cracked.

1.

Install spring seat wearpad (2) in upper spring bracket (1).

2.

Slide upper spring bracket (1) on bottom leaf (4) and install on axle housing (3) over dowel pin (5).

3.

Lower hydraulic jack until leaf spring assembly (7) seats in upper spring bracket (1) and remove

hydraulic jack from spring seat (6).

4.

Position spring brake chamber bracket (17) over upper spring bracket (1) and install with screw (8),

two washers (9), new lockwasher (16), and nut (15). Do not tighten nut (15).

5.

Install service brake U-bolt bracket (14) between brake chamber (18) and brake chamber bracket (17)

with U-bolt (11), two washers (19), and nuts (20). Tighten nuts (20) 120-160 lb-ft (163-217 N•m).

6.

Position service brake chamber bracket (23) over upper spring bracket (1) and install with

screw (21), two washers (22), new lockwasher (28), and nut (27). Do not tighten nut (27).

7.

Install service brake U-bolt bracket (26) between service brake chamber (24) and brake chamber

bracket (23) with U-bolt (25), two washers (29), and nuts (30). Tighten nuts (30) 120-160 lb-ft

(163-217 N•m).

8.

Install upper spring bracket (1) on spring brake chamber bracket (17) with two screws (10), new

lockwashers (12), and nuts (13). Tighten nuts (13) 280-360 lb-ft (380-488 N•m).

9.

Tighten nuts (15) and (27) 280-360 lb-ft, (380-488 N•m).

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