SERVICE AND ADJUSTMENTS
6 - 2
Issued: August 2003RT700 Series
VALVE ADJUSTMENTS
THIS MACHINE USES A PRESSURIZED HYDRAULIC
RESERVOIR. THE PRESSURE MUST BE RELEASED
BEFORE ANY HYDRAULIC LINE OR CONNECTION IS
OPENED.
Failure to do so will result in substantial loss of oil and may
cause personal injury. The pressure is relieved by turning the
reservoir cap counterclockwise to the first stop. DO NOT
turn the cap beyond the first stop until all pressure has been
released. This will cause the cap to be blown off the reservoir
with sufficient force to cause personal injury. DO NOT place
any portion of your body above the reservoir cap while
relieving pressure or removing cap.
BOOM HOIST & MAIN RELIEFS Check the boom relief
settings as follows:
1. Operate the boom over relief to warm the oil if neces-
sary.
2. Attach a calibrated pressure gauge to test port on the
inlet pressure port at the valve bank.
3. Lower the boom completely and continue to boom down
with the engine running at full governed rpm. The relief
setting should b 4500 psi. If necessary, adjust relief
valve.
BOOM RELIEF ADJUSTMENTS Adjust the boom hoist,
retract, and telescope reliefs using the following procedures.
Adjust the boom hoist relief by loosening jam lock nut on
relief valve. Adjust valve with adjusting screw while boom-
ing up or down over relief withe engine at maximum gov-
erned rpm. Screw in to increase pressure setting; out to
decrease it. Retighten lock nut when proper setting is
obtained.
EXTEND/RETRACT RELIEFS The initial range has been
preset. Adjustment is accomplished by loosening the jam nut
and either turning the adjusting screw in to increase pressure
or backing it off to lower pressure. Retighten the jam nut
when the desired pressure is obtained.
Set extend/retract by the following procedure:
First, retract the boom completely and continue to retract
over relief with the engine running at full governed rpm. Ini-
tially, set the retract port relief valve (located on spring cap
end of telescope section) to obtain a reading of 3500 psi.
MAIN WINCH RELIEF Check the winch relief setting
using the following procedure:
1. Attach a pressure gauge to the test port on the mid-sec-
tion inlet port.
2. Disconnect and plug the brake line at the piston housing
on the winch.
3. Restart the engine and run at high idle speed.
4. Winch and hold the lever in the “lower” position while
obtaining a reading. The proper setting is 4500 psi at
idle. The winch relief is located on the mid inlet section
of the valve bank. It is adjusted in the same manner as
the boom relief.
AUXILIARY WINCH RELIEF Check the pressure using
the following procedure. The auxiliary winch pressure is
controlled with a relief valve in the auxiliary winch valve.
1. Attach a pressure gauge to the main winch test port
which is also used to check auxiliary winch pressure.
2. Disconnect and plug the brake line at the piston housing
of the auxiliary winch.
3. Restart the engine and run at high idle speed.
4. Winch down and hold the lever in the “lower” position
while obtaining a pressure reading. The proper setting is
4500 psi. If required, adjust the relief valve at the auxil-
iary winch valve. This relief is adjusted in the same
manner at the boom relief.
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