TM-9-2320-361-34

2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

MAY 1992
TM-9-2320-361-34

  TM-9-2320-361-34 - Page 39 of 764

TM9-2320-361-34
Table 2-1. Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR lNSPECTlON
CORRECTIVE ACTION
DUMP BODY (M342A2)
49.
DUMP BODY WILL NOT RAISE
Step 1.
Step
2.
Step
3.
Step 4.
Step
5.
Step
6.
Step
7.
Step
8.
2-24
WARNING
●
Overhead lifting device capacity must exceed dump body weight.
A shifting, swinging, or falling load may cause injury to
personnel.
. Bleed hydraulic pressure before cracking hydraulic lines. Failure to
do so may result in damage to equipment and injury to personnel.
Apply parking brake (TM 9-2320-361-10).
NOTE
Some vehicles may not be updated to use dump body hydraulic lock
system. When vehicles do not have this system, substitute
hydraulic hose will be needed to take the place of existing hydraulic
hose on lock system called out in hydraulic system checks.
Check hydraulic lock operation. Operate controls to raise dump body (TM 9-2320-361-10).
Observe hydraulic lock operation.
If hydraulic lock will not release, manually open hydraulic lock and secure in open position.
Operate dump body to raise. If dump body raises, replace hydraulic lock cylinder or lock
assembly (para. 16-13).
Check hydraulic system for leaks.
WARNING
Use properly rated hydraulic hose when performing hydraulic
system checks on vehicles not equipped with dump body lock.
Failure to do this may result in injury to personnel.
NOTE
Tag
hydraulic hose ends of hydraulic lock system before removal
for installation.
Attach overhead lifting device to dump body and secure dump body hydraulic lock. Raise
dump body with lifting device until dump body is in fully raised position. Secure dump body
with safety braces (TM 9-2320-36 1-10).
Remove all hydraulic hose ends from upper and lower control box manifolds. Install tee
fitting into one of three open ports of upper manifold and plug two ports in upper and lower
manifold. Install high pressure gage into tee. Remove one hydraulic hose from lock cylinder
and adapt ends so that one end can connect to tee and the other end to open port on lower
manifold (para. 16-7).
Operate dump body with main control lever set in D position (TM 9-2320-361-10). Maintain
engine speed at 1,000 rpm for 10 seconds and observe pressure gage.
If pressure reading is uneven or zero, replace hydraulic pump (para. 16-12).
Check pump spacer for cracks or defects (para. 16-12).
If spacer is cracked or defective, replace (para. 16-12).
Replace control valve if pressure readings decrease slowly (para. 16-10).


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