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 TM 55-4920-405-13&P
Legend for fig. 4-6:
(c) Check to see that hydraulic tubing
does not interfere with your moving
1.
Hydraulic fluid reservoir
the hydraulic pump forward.
2.
Pump mounting bracket
(d) Disconnect FLOW INDICATOR GPM
3.
Pump coupling assembly
(11, figure 2-1) from the hydraulic
4.
High pressure filter
pump.
5.
Hydraulic pump
(e) Remove the snap ring at the engine
side of the coupling, and slide the
6.
Manifold
7.
Low pressure filter
coupling cover overt the engine shaft
to unmesh the gears.
(f) Remove the bolts that attach the
(b) Using a wrench, loosen the nut that
hydraulic pump to the pump mounting
attaches. the pressure compensator
control assembly to the hydraulic
bracket. Lift the hydraulic pump off
the test stand chassis.
pump.
(c) Separate the pressure compensator
(g) Repair or replace the defective
hydraulic pump.
control assembly from the hydraulic
pump. Be careful that you do not let
the plunger and ball bearings fall out
( 9 ) Selector Valves. To remove SUCTION
of the pressure compensator control
PRESSURE FILTER-OUT valve (21, fig-
assembly. Tape the open end of the
HIGH PRESS BYPASS VALVE (19), pro-
pressure compensator control assem-
ceed as follows:
bly to keep these parts in place.
(d) Pull the pressure compensator control
assembly out through the control
(a) Remove the screw that attaches the
handle to the valve. Remove the
panel.
(e) Replace the defective pressure com-
handle.
pensator control assembly.
(b) Disconnect all hydraulic tubing at the
rear of the valve. Tag the tubing so
(7) Volume Control. To remove VOLUME
that you will know how to reconnect it.
control (14, figure 2-1), proceed as
(c) Remove the hardware that attaches
follows:
the valve to the control panel. Re-
move the valve from the back side of
the control panel.
(a) Release the locking lever on the
(d) Replace the defective valve.
VOLUME control.
(b) Loosen the nut that attaches the
(10) Flow Control Valve. To remove FLOW
VOLUME control handwheel. (See
CONTROL VALVE (12, figure 2-1) pro-
ceed as follows:
washer, and key.
(c) Unscrew the locking lever, and re-
move it.
(a) Unlock the FLOW CONTROL VALVE
locking lever.
(d) Loosen the setscrew that attaches the
sleeve to the hydraulic pump. Un-
(b) Loosen the setscrew in the knob, and
screw the sleeve, and remove it.
remove the knob.
(c) Unscrew the locking lever.
(e) Loosen the setscrews that attach the
extension shaft to the hydraulic pump
(d) Disconnect the hydraulic tubing at the
rear of the valve. Tag the tubing so
volume adjusting screw. Remove the
that you will know how to reconnect it.
extension shaft.
(f) Replace any defective part.
(e) Remove the hardware that attaches the
valve to the control panel. Remove
the valve.
(8) Hydraulic Pump. To remove
hydraulic
(f) Replace the defective valve.
pump (5, figure 4-5), remove
the hydraulic
(11) Shutoff Valves. To replace FLUID PRESS
fluid reservoir, the pressure
compensa-
GAGE SHUTOFF valve (22, figure 2-1) or
tor, and the volume control.
Then, pro-
ceed as follows:
COMPENSATOR SHUTOFF VALVE (17),
proceed as follows:
(a) Remove all interconnecting tubing,
(a) Remove the screw that attaches the
hoses, and fittings from the hydraulic
handle to the valve. Remove the
pump.
handle.
(b) Note how the hydraulic pump is
(b) Disconnect the hydraulic tubing at the
mounted. It is turned 15 degrees from
rear of the valve. Tag the tubing so
a level plane. Mark the hydraulic
that you will know how to reconnect it.
pump housing, the mounting bracket.
(c) Using a wrench, remove the nut that
attaches the valve to the control panel.
and the engine housing so that you can
Remove the valve.
install the hydraulic pump in the same
position after repair.
(d) Replace the defective valve.
4-16
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