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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
Table 2-2.
Direct/General Support Troubleshooting (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
30.
PUMP EMITS HIGH PITCH WHINE AT HIGH PRESSURE SETTINGS, NO HYDRAULIC PRESSURE TO
AIRCRAFT.
Shut down complete unit and check HIGH PRESSURE BYPASS valve:
Remove (paragraph 8-7a.) and clean valve and clean the
a.
manifold where HIGH PRESSURE BYPASS valve fits.
Inspect valve cartridge for nicks, scratches, or broken
b.
packing. Replace valve cartridge if necessary.
Replace valve packing.
c.
Re-install HIGH PRESSURE BYPASS valve (paragraph 8-7.b.) and
d.
verify operation.
31.
PUMP EMITS HIGH PITCH WHINE BEFORE HYDRAULIC MODULE OUTPUT TURNED ON.
Shut down complete unit. Remove pump output check valve (53, figure
Step 1.
Replace pump suction QD (item 34, figure 8-15) check valve:
step 2.
a. Disassemble module to gain access to pump suction QD. Use
procedure of paragraph 8-16 steps a. through af.
Remove QD and copper seal.
b.
Install new QD with new copper seal.
c.
d.
Reassemble module using procedure of paragraph 8-18 starting
with step b.
PUMP EMITS HIGH PITCH WHINE AFTER HYDRAULIC MODULE OUTPUT TURNED ON.
32.
Step 1.
Shut down complete unit and replace module HIGH PRESSURE QD check
valve (6, figure 8-19):
a.
Remove HIGH PRESSURE QD fitting.
Clean manifold hole where QD fits.
b.
Install a new QD fitting with new packing.
c.
2-17
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