Terex RT700 - Swing Relief Valve Adjustment; Pilot Control Valve Pressure Check

SERVICE AND ADJUSTMENTS
6 - 3
Issued: August 2003RT700 Series
VALVE ADJUSTMENTS
SWING RELIEF Check the swing relief using the follow-
ing procedure:
NOTE: Prior to checking the swing relief valve pressure set-
ting the outrigger relief MUST be set to the proper pressure.
1. Operate the boom over relief to warm the oil if necessary.
2. Attach a calibrated pressure gauge in test port “D” see il-
lustration below.
NOTE: Test port “D” is located on the swing valve which is
mounted inside the super structure just to the left of the
swing reduction unit.
3. Set the swing brake and begin to attempt to swing the ma-
chine against the swing brake. You should exercise cau-
tion in doing this until you know that the swing brake is
in good working order and will hold against the swing
pressure.
Once you have verified that the swing brake is holding
the engine RPM should be brought up to full governed
speed slowly. The swing pressure should be 2500 PSI ±
50 PSI. If necessary adjust the relief.
NOTE: If the swing pressure is low be certain to use cation
when adjusting, if the swing brake is not in proper working
order the increase in pressure may allow the machine to
swing through the brake.
SWING RELIEF VALVE ADJUSTMENT Adjust this
relief using the following procedure:
Remove the acorn nut and loosen the jam nut on the relief
valve. Adjust the relief valve with the adjusting screw while
attempting to swing against the swing brake at full engine
RPM. Screw in the adjustment to increase the pressure and
out to decrease it. When the pressure is at 2500 PSI ± 50 PSI
tighten the jam nut.
Recheck the pressure after tightening the jam nut as the pres-
sure may change due to tightening the jam nut.
TEST PORT
“D”
FRONT OF MACHINE
SWING RELIEF
VALVE
PILOT CONTROL VALVE Check the pilot pressure us-
ing the following procedure:
Insert pressure gauge in front of winch valve. Use quick dis-
connect located on lower front pilot cap. With engine at idle
and boom retract running over relief, depress boom retract
pedal.
The pilot pressure should be 500psi ± 25psi. Turn screw 1/4
turn clockwise to increase pilot pressure. Turn screw 1/4
turn counter-clockwise to decrease pilot pressure. Recheck
pressure at winch valve.
PILOT
PRESSURE
ADJUSTMENT