4-142
TM 9-2330-238-14
4-62. COUNTERBALANCE MAINTENANCE (M749 CONVERTO MODEL 8929) (Con’t).
2.
Inspect wire rope assembly for wear, breaks, kinks, or frayed areas.
3.
Inspect arms for cracks, bends, or breaks. Straighten any minor bends.
4.
Inspect groove pulleys for excessive wear or cracks.
5.
Inspect counterbalance bar for cracks, bends, or breaks. Straighten any minor bends.
6.
Inspect all mounting hardware for cracks or damaged threads.
Replace or repair all defective parts as necessary.
1.
Position two arms (16 and 17) together with slotted holes alined. Install two new rivets (20) in slotted holes.
2.
Position bracket (18) on end of arm (17) and through eyebolt (21) and install new rivet (19).
3.
Position bracket (3) and counterbalance bar (27) on arm (2) with holes alined. Install two bolts (l), new
Iockwashers (11), and nuts (12).
e.
INSTALLATION
1.
2.
3.
4.
5.
6.
7.
Position two guide clip assemblies (26) and counterbalance bar (27) in place on corner post(15) and install two
screws (25), new Iockwashers (14), and nuts (13).
Position two brackets (3 and 18) with arms (2, 16, and 17) attached on upper and lower folding side doors, and
install four screws (5) and new Iockwashers (4).
Screw turnbuckle (23) to lower end of wire rope assembly (9).
Aline holes in end of arm (16) with holes in corner post (15). Position lower groove pulley (8) with wire rope
assembly (9) behind, in channel of arm. Install headed straight pin (6) and new cotter pin (1 O).
Position upper groove pulley (8) with wire rope assembly (9) behind, in corner post (1 5). Aline holes and install
headed straight pin (6) and new cotter pin (1 O).
Aline hole in upper end of wire rope assembly(9) with top hole in counterbalance bar (27). Install screw(7), new
Iockwasher(11 ), and nut (12).
Remove jacks or blocking from lower folding side door.
f.
ADJUSTMENT
1.
Loosen nuts (22 and 24).
2.
Turn turnbuckle (23) clockwise or counterclockwise until proper tension is obtained on wire rope assembly(9).
Tighten nuts (22 and 24) on each end of wire rope assembly to lock turnbuckle in position.
3.
Lubricate turnbuckle (23) and groove pulleys (8) in accordance with Lubrication Instructions (Chapter 3,
Section l).
