Groundsmaster 4300--DHydraulic System Page 4 -- 62
Filtering Closed--Loop Traction Circuit
Filteringofaclosed--loophydraulicsystemafteramajor
component failure (e.g. traction (piston) pump or wheel
motor)is arequirement toprevent debrisfrom transmit-
ting throughout the system. If a closed--loop hydraulic
systemfilteringtoolisnotusedtoensuresystemcleanli-
ness, repeatfailures, as wellas subsequent damage to
other hydraulic components in the affected system, will
occur. To effectively remove contamination from
closed--looptractioncircuit,useoftheTorohighflowhy-
draulic filter and hydraulic hose kits are recommended
(see Special Tools in this chapter).
1. Parkmachineonalevelsurfacewithenginestopped
and key removed from ignition switch.
2. Raise and support machine so all wheels are off the
ground(seeJackingInstructionsinChapter1 -- Safety).
NOTE: Ifwheelmotorwasreplaced,installhighflowfil-
ter tothe inletof thenew motor insteadof to thetraction
pump fitting. This will prevent system contamination
from entering and damaging the new wheel motor.
3. Thoroughly cleanjunction ofhydraulic hose andleft
side elbow fitting on bottom of traction pump (Fig. 63).
Disconnect hose from left side pump fitting.
4. Connect Toro high flow hydraulic filter in series be-
tweentractionpumpfittinganddisconnectedhose.Use
hydraulic hose kit (see Special Tools in this chapter) to
connectfiltertomachine.Makesurethatfittingandhose
connections are properly tightened.
IMPORTANT: Use only hydraulic fluids specified in
Operator’sManual.Otherfluidscouldcausesystem
damage.
5. After installing high flow filterto machine, check and
fillhydraulicreservoirwithnewhydraulicoilasrequired.
6. Startengineandrunatidlespeed.Checkforanyhy-
draulic leakage from filter and hose connections. Cor-
rect any leaks before proceeding.
CAUTION
Allwheelswillbeoffthegroundandrotatingdur-
ing this procedure. Make sure machine is well
supported so it will not move and accidentally
fall to prevent injuring anyone around machine.
IMPORTANT: While engaging the traction circuit,
monitor the indicator on the high flow hydraulic fil-
ter. If the indicator should show red, either reduce
pressure on the traction pedal or reduce engine
speed to decrease hydraulic flow through the filter.
7. With engine running at low idle speed, slowly move
the traction pedal to the forward direction to allow flow
throughthetractioncircuitandhighflowfilter.Keeptrac-
tion circuit engaged for five (5) minutes while gradually
increasing both forward pressure on traction pedal and
engine speed. Monitor filter indicator to make sure that
green color is s howing during operation.
8. With engine running at high idle speed and traction
pedalmoved tothe forwarddirection, periodically apply
brakes to increase pressure in traction circuit. While
monitoring filter indicator, continue this process for an
additional five (5) minutes.
IMPORTANT: IfusingafilterthatisnottheTorohigh
flow filter that is bi--directional, do not press the
traction pedal in the reverse direction. If flow is re-
versed when using a filter that is not bi--directional,
debris from the filter will re--enter the traction cir-
cuit.
9. With engine running at high idle speed, alternately
movetractionpedalfromforwardtoreverse.Whilemon-
itoring filter indicator, continue this process for an addi-
tional five (5) minutes.
10.Shutengine off andremovekeyfromignition switch.
11.Removehigh flowhydraulic filterandhydraulichose
kit from machine. Connect hydraulic hose to left side
tractionpumpfitting.Makesuretoproperlytightenhose
(seeHydraulicHoseandTube InstallationintheGener-
al Information section of this chapter).
12.Lower machine to ground.
13.Checkoillevel inhydraulicreservoirandaddcorrect
oil if necessary.
1. Traction pump
2. RH elbow fitting
3. Hyd hose (forward)
4. LH elbow fitting
5. Hyd hose (reverse)
Figure 63
FRONT
RIGHT
2
3
1
4
5
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