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Page Title:
Table 2-2. Direct/General Support Troubleshooting - continued |
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  TM 55-1730-229-34
AG 320A0-MME-000
TO 35C2-3-473-2
TM 1730-34/1
Direct/General Support Troubleshooting (continued)
Table 2-2.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
SYSTEM WON'T DRAIN.
7.
Check SYSTEM DRAIN valve for clogging:
a. Remove (paragraph 8-7.a.) and clean valve and clean the
manifold where SYSTEM DRAIN valve fits.
Inspect valve cartridge for signs of blockage (i.e., lodged
b.
bits of packing). Replace valve cartridge if necessary.
c. Replace valve packing.
Re-install SYSTEM DRAIN valve (paragraph 8-7.b.) and verify
d.
operation.
8.
LOSS OF PRESSURE BEFORE AND AFTER OUTPUT SWITCH SET TO ON.
PRESSURE (INCREASE/
DECREASE) SWITCH NOT EFFECTIVE.
Step 1.
Shut down complete unit and check PRESSURE RELIEF valve adjustment:
a. Check jam nut and cartridge. If jam nut is loose, cartridge
can back out leaving PRESSURE RELIEF valve completely open.
Adjust valve and tighten jam nut as necessary.
b.
Step 2.
Check PRESSURE RELIEF valve condition:
a. Remove (paragraph 8-7.a.) and clean valve and clean the
manifold where PRESSURE RELIEF valve fits.
Inspect valve cartridge for nicks, scratches, or broken
b.
packing. Replace valve cartridge if necessary.
c. Replace valve packing.
d.
Re-install PRESSURE RELIEF valve (paragraph 8-7.b.) and
verify operation.
LOSS OF PRESSURE BEFORE AND AFTER OUTPUT SWITCH SET TO ON. PRESSURE SWITCH MAY
9.
BE PARTIALLY EFFECTIVE OR INEFFECTIVE.
Problem could be in piston mechanism or swash plate of pump. Swash plate
problems affect response to commands from PRESSURE (INCREASE/DECREASE) switch.
Replace hydraulic pump (paragraph 8-4).
2-7
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