Groundsmaster 4100--D/4110--DHydraulic System Page 4 -- 4
Relieving Hydraulic System Pressure
Beforedisconnecting orperformingany workonthe hy-
draulic system, all pressure in the hydraulic system
mustberelieved.Parkmachineonalevelsurface,lower
cutting deck fully, stop engine and engage parking
brake. Wait for all moving parts to come to a complete
stop.
To relieve hydraulic pressure in traction circuit, move
tractionpedaltobothforwardandreversedirections.To
relieve hydraulic pressure in steering circuit, rotate
steering wheel in both directions.
To relieve hydraulic pressure in lift circuit, start engine
and fully lower the cutting deck (including the wing
decks).TurnkeyswitchtoOFFandremovekeyfromthe
ignition switch.
System pressure in mow circuit is relieved when the
PTO switch is disengaged.
Traction Circuit Component Failure
The traction circuit on Groundsmaster 4100--D and
4110--Dmachines is a closed loop system that includes
the piston (traction) pump, two (2) front wheel motors
and the rear axle motor. If a component in the traction
circuit should fail, debris and contamination from the
failed component will circulate throughout the traction
circuit. This contamination can damage other compo-
nents in the circuit so it must be removed to prevent
additional component failure.
The recommended method of removing traction circuit
contamination would be to temporarily install the Toro
high flow hydraulic filter (see Special Tools in this chap-
ter) into the circuit. This filter should be used when con-
necting hydraulic test gauges in order to test traction
circuitcomponentsorafterreplacingafailedtractioncir-
cuit component (e.g. traction (piston) 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
placedinthe circuit, raiseandsupport themachinewith
all wheels offthe ground. Then, operate the traction cir-
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,thetractioncircuitc anbeoperatedinboththefor-
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 c omponent 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.
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