Groundsmaster 4300--DHydraulic System Page 4 -- 8
Relieving Hydraulic System Pressure
Beforedisconnectingor performinganywork onthehy-
draulic system, all pressure in the hydraulic system
mustberelieved.Parkmachineonalevelsurface,lower
cutting decks fully, stop engine and engage parking
brake.
To relieve hydraulic pressure in traction circuit, move
tractionpedaltobothforwardandreversedirections.To
relieve hydraulic pressure in steering circuit, r otate
steering wheel in both directions.
System pressure in cutting circuit is relieved when the
cutting decks are disengaged.
To relieve hydraulic pressure in lift circuit, turn ignition
switchtoON(donotstartengine)andfullylowerthecut-
ting decks. After decks are fully lowered, turn ignition
switch to OFF and remove key from the switch.
IMPORTANT: If machine will be serviced on a lift or
atanelevatedposition,fullylowert he cuttingdecks
afterthemachinehasbeenraisedto ensure thatthe
lift cylinders are fully extended. Pressure will be
maintained in the lift cylinders unless they are fully
extended.
Traction Circuit Component Failure
The traction circuit on Groundsmaster 4300--D ma-
chines is a closed loop system that includes the piston
(traction) pump and four (4) wheel motors. If a compo-
nentinthetractioncircuitshouldfail,debrisandcontam-
ination from the failed component will circulate
throughout the traction circuit. This contamination can
damageothercomponentsinthecircuitsoitmustbere-
moved to prevent additional component failure.
The recommended method of removing traction circuit
contamination would be to temporarily install the high
flow hydraulic filter (see Special Tools in this chapter)
intothe circuit.Thisfilter shouldbeused whenconnect-
ing hydraulic test gauges in order to test traction circuit
components or after replacing a failed traction circuit
component(e.g.traction(piston)pumporwheelmotor).
The filter will ensure that contaminates are removed
from the closed loop and thus, do not cause additional
component damage.
Once the Toro high flow hydraulic filter kit has been
placedin thecircuit,raise andsupportthe machinewith
all wheelsoffthe ground. Then,operate the tractioncir-
cuit to allow oil flow throughout the circuit. The filter will
remove contamination from the traction circuit during
operation. Because the Toro high flow filter is bi--direc-
tional,thetractioncircuitcanbeoperatedinboththefor-
ward 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.
NOTE: The traction pump c ase drain could allow any
debrisinthetractioncircuittocontaminateotherhydrau-
lic circuits on the machine.
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