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TM 10-3930-631-34
pressure gage. When pressure reaches 1900 psi (133.5
2
kg-cm ) needle should stop indicating relief valve has
opened.
(3) If relief valve opens above or below 1900 psi
it must be adjusted.
(4) Remove acorn nut covering adjusting screw
at top front of lift control section.  Loosen jam nut
securing adjusting screw.
(5) Hold lift control lever all the way to the rear
and adjust pressure. Turn adjusting screw clockwise to
increase pressure and coun- terclockwise to reduce
pressure.
(6) After pressure is properly adjusted, hold
adjusting  screw  and  tighten  jam  nut  to  secure
adjustment.
(7) Push lift control lever forward to lower
carriage a short distance. Pull lever all the way to the
rear and hold in this position. Check gage. Relief valve
should open at 1900 psi. Install acorn nut.
(8) Turn master switch off, disconnect battery
receptacle and discharge capacitors.
(9) Disconnect pressure gage and install pipe
Figure 7-4. Checking low volume inlet pressure.
plug in valve.
(10)Install floor plate and center cover panel.
(3) Connect battery receptacle, sit on seat,
7-4. Hydraulic Control Valve
place directional control lever in neutral and turn master
a. Description. The hydraulic control valve (fig. 7-
switch on.
5) is made up of four sections.  Inlet and housing
(4) Pull the tilt lever back to actuate the pump
sections enclose the three operating plunger sections.
and retract the tilt cylinders. Hold lever all the way back.
Three operating plunger sections are the side shift, tilt
(5) Observe pressure gage.  When pressure
and lift sections. Relief valves are installed in the inlet
reading of 2100 psi (147.6 kg-cm2) is reached needle
and lift control sections.
should stop indicating relief valve opening.
(6) If relief valve opens below or above 2100
psi, relief valve must be adjusted.
(7) Remove acorn nut covering adjusting screw
(fig. 7-4). Acorn nut is located on bottom of inlet valve
section.
(8) Loosen jam nut on adjusting screw and hold
lever in full rearward position as in (4) above. Turn
adjusting
screw
clockwise
to
increase
or
counterclockwise to decrease pressure.
(9) When pressure is properly adjusted, hold
adjusting  screw  and  tighten  jam  nut  to  secure
adjustment.
(10) Release tilt control lever and push lever
forward to relieve pressure. Pull lever to rear and again
check pressure setting.  Relief valve should open at
2100 psi. Install acorn nut.
c.  High Volume Pressure Adjustment.
(1) Do not remove pressure gage from inlet
section.
(2) While sitting on operator's seat and with
master switch on, pull lift control lever all the way to the
Figure 7-5. Control Valve.
rear. When mast reaches limit of extension, hold lever
all the way to the rear and observe
7-7

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