Table 3-3. Qualification Procedure - Continued
Troubleshooting
Reference
Command
Response
(Figure No.)
13. Place bulldozer operating
Moldboard elevates to full-raised
handle on RAISE IRI position and
position
raise moldboard to full-raised
position.
14. Position the carrying hook
Carrying hooks engaged.
operating handle to the engage
positions and engage carrying hooks.
15. Place HYDRAULIC PUMP
HYDRAULIC PUMP indicator
switch in the OFF position goes
OFF. Clutch disengages
hydraulic pump.
16. Stop engine and place the
MASTER SWITCH indicator goes
MASTER SWITCH in the Off
OFF.
position.
Table 3-4. Troubleshooting
Malfunction
Probable cause
Corrective action
1.
Moldboard fails to maintain
a.
Insufficient oil in the hydraulic
a.
Refill reservoir see 1I0 9-2590-
desired HOLD position
and system 213-12.
responds sluggishly to control
b.
Restricted oil flow caused by
b.
when being raised or lowered.
clogged reservoir screen
c.
Damaged hydraulic lines and
c.
Replace all punctured flexible
fittings.
hose and metal tubing or damaged
fittings. Repair or replace metal
tubing that is damaged to the
point where it is restricting oil
flow.
d.
Damaged cylinder seals.
d.
Replace cylinder seals damaged
e.
Faulty hydraulic pump.
e.
Inspect pump and listen for
unusual noises Determine that
shafts, and (4) wear plates are in
good condition This requires
removal of pump Replace pump
f.
Faulty operation of directional
f.
Adjust control valve linkage if it is
control valve or mechanical
binding or distorted Check valve
linkage.
g.
Presence of air in hydraulic line.
g.
Operate moldboard continuously
until air is completely
disseminated as evidenced by fully
effective moldboard control.
Note: Hydraulic system is self-
h.
Decrease in oil supply in the
h.
Check oil level in hydraulic
hydraulic system, causing
system and refill reservoir if
overheating of pump.
necessary see LO 9-2590-213-12.
3-8