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 TM 5-5420-279-23
a.
Remove
(1)
De-pressurize hydraulic system. Refer to
unit maintenance procedure 5-118.
(2)
Locate the manifold block (4) and identify
the stack valve, which requires
maintenance.
(3)
Place a drain vessel under the manifold
(4) to catch any spilled fluid.
(4)
Note the position of and disconnect the
electrical connections to the directional
control valve (9).
(5)
Draw a line across the side of the valve
body to be used when installing the stack
valve.
(6)
Remove and retain the four screws (11)
securing the directional control valve (9)
and the pressure reducing valve (8) to
the check valve body (7).
(7)
Ensure that the eight seals (5) are
removed from the directional control
valve (9) and pressure reducing valve (8)
and the check valve body (7).
(8)
Cover exposed ports to prevent the
ingress of dirt and moisture.
(9)
If a cartridge throttle (14) is fitted to the
pressure port, 'P' channel of the
directional control valve (9) remove and
clean it.
(10)
Remove and retain the four screws (10)
securing the check valve body (7) and
pressure compensating valve (6) to the
manifold (4).
(11)
Ensure that the eight seals (5) are
removed from the check valve body (7)
and pressure compensating valve (6)
and manifold (4).
(12)
Cover exposed ports to prevent the
ingress of dirt and moisture.
5-367
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