Direct/General Support Troubleshooting (continued)
TEST OR INSPECTION
CANNOT APPLY HYDRAULIC PRESSURE TO AIRCRAFT (continued)
Disconnect wire C119B20 from TB2-3. Check for continuity between
TB2-10 and the loose end of wire C119B20.
If continuity, do step 4. Reconnect wire.
Clean the dual manifold hole where valve fits. Inspect valve for
nicks, scratches, or broken packing.
If valve is defective, replace valve and packing, and verify
If valve appears good, re-install valve using new packing,
and verify operation. If malfunction still exists, shut down
unit and do step 5.
Remove and disassemble module by performing steps a. through x. of
Clean clogged orifice and screen (15, 22, figure 8-10) between pilot
valve and load valve. Replace pilot valve block (66, figure 8-14)
with step k.
PUMP EMITS HIGH PITCH WHINE WITH LOSS OF PRESSURE AT HIGH PRESSURES.
Shut down complete unit and check RETURN BLEED valve:
manifold where RETURN BLEED valve fits.
Inspect valve cartridge for nicks, scratches, or broken
packing. Replace valve if necessary.
Replace valve packing.