Greensmaster 3300/3400 Hydraulic SystemPage 5 -- 5
Relieving Hydraulic System Pressure
Before disconnecting or performing any work on your
Greensmaster hydraulic system, all pressure in the hy-
draulic system must be relieved.
To relievehydraulicpressure in thetractioncircuit, park
machineonalevelsurfacewiththecuttingunitslowered
and off. Turn ignition switch to OFF and allow engine to
stop. If machine is parked on an incline or slope, pres-
sure in the traction circuit WILL NOT be relieved.
To relievehydraulicpressure inliftcircuit,fully lowerthe
cutting units to the ground. Turn ignition switch to OFF
and allowengine to stop.Make sure thatafter lowering,
none of the cutting units are notbeing supported by the
lift cylinders.
Torelievehydraulicpressureinthesteeringcircuit,park
machineonalevelsurfacewiththecuttingunitslowered
and off. Turn ignition switch to OFF. After engine has
come to a complete stop, rotate steering wheel in both
directions.
Hydraulic pressure in the mow circuit is relieved when
the ignition switch is turned to OFF.
Traction Circuit Component Failure
The traction circuit on your Greensmaster machine is a
closed loop system that includes the piston (traction)
pumpand two(2)wheelmotors (three(3) wheelmotors
are included if machine is equipped with optional 3WD
kit). If a componentinthe traction circuit should fail, de-
bris and contamination from the failed component will
circulatethroughoutthetractioncircuit.Thiscontamina-
tion can damage other components in the circuit so it
must be removed to prevent additional component fail-
ure.
The recommended method of removing traction circuit
contamination would be to temporarily install the Toro
high flow hydraulicfilter(see Special Tools in thischap-
ter) into thecircuit. Thisfiltershould be usedwhencon-
necting hydraulic test gauges in order to test traction
circuitcomponentsorafterreplacingafailedtractioncir-
cuit component (e.g. piston (traction) pump or wheel
motor). The filter will ensure that contaminates are re-
movedfromtheclosedloopandthus,donotcauseaddi-
tional component damage.
Once the Toro high flow hydraulic filter kit has been
placedin thecircuit, raiseandsupport themachinewith
all drive wheels off the ground. Then, operate the trac-
tioncircuittoallow oilflow throughoutthecircuit. Thefil-
ter will remove contamination from the traction circuit
duringoperation.Because theToro highflow filterisbi--
directional, the traction circuit can be operated in both
the forward and reverse direction. The filter should be
removed from the machine after contamination has
been removed from the traction circuit. See Filtering
Closed--LoopTractionCircuitintheServiceandRepairs
section of this chapter for additional information on us-
ing the Toro high flow hydraulic filter.
ThealternativetousingtheTorohighflowhydraulicfilter
kit after a traction circuit component failure would be to
disassemble, drain and thoroughly clean all compo-
nents, tubes and hoses in the traction circuit. If any de-
bris remains in the traction circuit and the machine is
operated,thedebriscancauseadditionalcircuitcompo-
nent failure.
Hydraulic
System
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