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HIGH PRESSURE RELIEF VALVE INSPECT
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TM-55-4920-426-13-P Gasoline Engine Driven Hydraulic Systems Test Stand Type Type D5-D P/N 79009-100 NSN
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ASSEMBLY - TM-55-4920-426-13-P0194
TM 55-4920-426-13&P
3-92
HIGH PRESSURE RELIEF VALVE REPAIR
3-92
Disassembly and Assembly
This task covers:
INITIAL SETUP
Equipment
Condition
Para
Condition Description
Personnel Required
Valve removed
68H Aircraft Pneudraulic
Repairman
Materials/Parts
Tools
Housing "O" ring - Part
Number 79009-205-12
1-1/8 in. open end wrench
Housing backup ring - Part
Number 79009-205-11
Housing large "O" ring -
Part Number 79009-205-10
Cap "O" ring - Part Number
79009-205-6
Piston "O" ring - Part
Number 79009-205-5
1. DISASSEMBLY
Remove relief valve from body using a 1-1/8 inch open end wrench.
a.
Hold relief valve assembly with a 1-1/8 inch open end wrench, then use open end wrench and
b.
remove pilot cartidge (Knob cartridge housing) from relief valve housing. Remove spring.
Remove "O" ring and backup ring from cartridge housing.
c.
Remove large "O" ring from cartridge housing.
d.
Remove cap from cartridge housing, using open end wrench.
e.
f.
Remove spring and poppet.
Remove cap "O" ring.
g.
Remove piston, piston "O" ring, nut and knob from cap.
h.
i.
Remove the large "O" ring from the relief valve housing.
Remove the "O" ring and back up ring from the relief valve housing.
j.
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