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 TM 5-5420-279-23
b.
Service
(1)
Hold the pressure relief valve (2) in a suitable vice.
WARNING
INJURY TO PERSONNEL. THE INTERNAL PARTS OF THE PRESSURE RELIEF
VALVE ARE UNDER SPRING TENSION. CARE MUST BE TAKEN WHEN
DISASSEMBLING THE PRESSURE RELIEF VALVE.
(2)
Slowly screw the valve bolt (14) counter clockwise.
(3)
Remove the valve bolt (14) and retain the seal (13).
(4)
Remove and retain the internal parts (6 - 12) of the pressure relief valve.
(5)
Clean the pressure relief valve body (2), valve bolt (14) and internal parts (6 - 12) in clean
hydraulic fluid).
(6)
Check all parts for wear and damage.
(7)
Replace the pressure relief valve complete if any parts are damaged.
c.
Install
(1)
Assemble the pressure relief valve internal parts (6-12) in the correct order.
(2)
Fit the valve bolt (14) with the seal (13).
(3)
Fit the pressure relief valve (2) to the crane valve control block (1).
(4)
Check the operation of the crane in accordance with the operator's manual TM 5-5420-
279-10 and check for hydraulic leaks at the pressure relief valve.
6-223
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