TM-9-2330-238-14

CHASSIS, SEMITRAILER: 6-TON, 4-WHEEL M295A1; SEMITRAILER, VAN: EXPANSIBLE, 6-TON, 4-WHEEL M313; SEMITRAILER, VAN: SHOP, FOLDING SIDES, 6-TON, 4-WHEEL M447 AND M447C; SEMITRAILER, VAN: REPAIR PARTS, SHOP EQUIPMENT, 6-TON, 4-WHEEL M749; SEMITRAILER, VAN: REPAIR PARTS STORAGE, 6-TON, 4-WHEEL M750

TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL

JULY 1992

TM-9-2330-238-14 - Page 238 of 462

TM 9-2330-238-14

4-62. COUNTERBALANCE MAINTENANCE (M749 CONVERTO MODEL 8929).

This Task Covers:

Removal

d.

Assembly

Disassembly

Installation

c.

Cleaning and Inspection

Adjustment

Initial Setup:

Equipment Conditions:

Materials/Parts:

●

Semitrailer parked on firm, level ground.

●

Dry cleaning solvent (Item 14, Appendix E)

Tools/Test Equipment:

●

Two cotter pins

●

Three rivets

●

General mechanic’s tool kit

●

Eight Iockwashers

●

Hydraulic jacks

I

a.

REMOVAL I

1.

Set jacks or blocking under lower folding side door to release tension on wire rope assembly

(9).

2.

Remove screw (7), Iockwasher(11 ), and nut(12) from wire rope assembly(9) and upper end of counterbalance

bar (27). Discard lockwasher.

3.

Remove two cotter pins (1 O) from headed straight pins (6). Remove headed straight pins and upper and lower

groove pulleys (8) from corner post (15). Discard cotter pins.

4.

Unscrew turnbuckle

(23)

from lower end of wire rope assembly(9) and remove upper end of wire rope assembly

from corner post (15).

5.

Remove four screws (5), Iockwashers (4), two brackets (3 and 18), and three arms (2, 16, and 17) from upper and

-

lower folding side doors. Discard Iockwashers.

6.

Remove two screws (25), guide clip assemblies (26), lockwashers (1 4), nuts (1 3), and counterbalance bar (27)

from corner post (15). Discard lockwashers.

I

b.

DISASSEMBLY I

1.

Remove two bolts (1), Iockwashers(11 ), nuts (12), and arm (2) from bracket (3) and counterbalance bar (27).

Discard Iockwashers.

2.

Remove rivet (19) and bracket (18) from arm (17) and eyebolt (21). Discard rivet.

3.

Remove two rivets (20) and separate arms (16 and 17). Discard rivets.

I

c.

CLEANING AND INSPECTION

WARNING

Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective goggles

and gloves, and use only in a well-ventllated area. Avoid contact with skin, eyes, and

clothes, and DO NOT breathe vapors. DO NOT use near open flame or excessive heat.

The solvent’s flash point is 100

0

F-138°F (38

0

C-59

0

C). if you become dizzy while

using cleaning solvent, immediately get fresh air and medical help. if solvent contacts

eyes, immediately wash your eyes and get medical aid.

1.

Clean all parts with dry cleaning solvent and dry thoroughly.

4-140