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 TM 5-5420-279-23
a.
Remove
(1)
De-pressurize the hydraulic system. See unit maintenance procedure 5-118.
(2)
Ensure the crane is in the stowed position. Note the position of and remove the two
hydraulic pipes connected to the valve.
(3)
Remove the two socket head screws securing the valve to the lift cylinder.
b.
Service
(1)
If the valve is being removed for cleaning remove the set screw (2).
(2)
Remove the control head mechanism (1).
(3)
Remove the actuator assembly (3) noting the position of it's component parts (4), (5), (6)
and (7).
(4)
Remove strainer (9) and nozzle (8).
(5)
Clean all components in clean hydraulic fluid.
c.
Install
(1)
Fit nozzle (8) and strainer (9).
(2)
Fit the actuator assembly (3) noting the position of it's component parts (4), (5), (6) and (7).
(3)
Fit the control head mechanism (1).
(4)
Fit the set screw (2).
(5)
Apply thread locking compound to the socket head screws.
(6)
Fit the valve to the lift cylinder with the two socket head screws.
(7)
Fit the two hydraulic pipes in the positions noted during removal.
d.
Follow on task
(1)
Check the operation of the crane and check for leaks.
6-176
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