4-63. COUNTERBALANCE MAINTENANCE (M749 SOUTHWEST MODEL VRP).
This Task Covers:
Cleaning and Inspection
l Semitrailer parked on firm, level ground.
Dry cleaning solvent (Item 14, Appendix E)
. Two cotter pins
l General mechanics tool kit
l Four Iockwashers
l Hydraulic jacks
Set jacks or blocking under lower folding side door to release tension on wire rope assembly (9).
Remove screw (8), Iockwasher (30), and nut (29) from wire rope assembly (9) and upper end of counterbalance
bar (28). Discard Iockwasher.
Remove screw (7), upper groove pulley (1 O), spacer (1 1), Iockwasher (1 2), and nut(13) from corner post (27).
Remove screw (7), lower groove pulley (1 O), spacer (1 8), and nut (19) from corner post (27).
Unscrew turnbuckle(16) from lower end of wire rope assembly(9) and remove upper end of wire rope assembly
from corner post (27).
Remove four screws (6), two brackets (3 and 22), and arms (2, 20, and 21 ) from upper and lower folding side
Remove two nuts (15), screws (25), guide clip assemblies (26), and counterbalance bar (28) from corner post
b. DISASSEMBLY I
Remove two bolts (1), Iockwashers (4), nuts (5), and arm (2) from bracket (3) and counterbalance bar (28).
Remove headless straight pin (23) and bracket (22) from arm (21).
Remove rivet (24) and separate arms (20 and 21). Discard rivet.
CLEANING AND inspection I
Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective goggles
and gloves, and use only in a well-ventilated area. Avoid contact with skin, eyes, and
clothes, and DO NOT breathe vapors. DO NOT use near open flame or excessive heat.
The solvents flash point is 100°F-138°F (38°C-590C). 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.
Clean all parts with dry cleaning solvent and dry thoroughly.