o With the primary or backup hydraulic system operating, manually
operate the stacker directional control solenoid in both
directions (Fig. 62F). If the directional control valve fails to
operate correctly, you must replace it.
If the directional
control valve functions correctly, you must remove the stacker
hydraulic brake and send it to support maintenance.
4.
Primary Hydraulic Pump.
There are two different problems for this system.
They both will be
solved using the same troubleshooting procedures.
o Insufficient or no system pressure.
o Loss of hydraulic pressure during operation.
NOTE:
System pressure is indicated at the hydraulic control panel
pressure gage. System pressure should be 100 - 300 psi without
system load.
NOTE:
Vehicles 345 and above do not have a sight gage on the hydraulic
reservoir.
There are two general items that must be checked prior to troubleshooting
the system:
o Ensure the suction ball valve from the hydraulic reservoir is
open.
o Check the hydraulic oil level at the reservoir. If it is low,
fill it to the proper level with the approved grade of hydraulic
oil (LO 9-2350-267-12).
Begin troubleshooting the system at the hand pump selector valve.
o Ensure the hydraulic system selector valve is in the IN position
(TM 9-2350-267-10)(Fig. 3F). If the selector valve is not in the
proper position, put it in the IN position and restart the
system.
If the selector valve is in the correct position,
continue to troubleshoot the system.
o Inspect hydraulic lines, connections, and fitting for leaks or
other damage. Replace or repair lines, connections, and fitting
as required. If the hydraulic lines are satisfactory, you must
continue to troubleshoot the system.
68
OD1703
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