Groundsmaster 4100--D/4110--DHydraulic System Page 4 -- 76
Filtering Closed--Loop Traction Circuit
Filteringofaclosed--loophydraulicsystemafteramajor
component failure (e.g. traction (piston) pump or front
wheel motor) is a requirement to prevent debris from
transmittingthroughoutthesystem.Ifaclosed--loophy-
draulicsystemfilteringtoolisnotusedtoensuresystem
cleanliness,repeatfailures,aswellassubsequentdam-
age to other hydraulic components in the affected sys-
tem, will occur. To effectively remove contamination
from closed--loop traction circuit, use of the Toro high
flow hydraulic filter and hydraulic hose kits are recom-
mended (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: If front wheel or rear axle motor was replaced,
install high flow filter to the inlet of new motor instead of
tothetractionpumpfitting.Thiswillpreventsystemcon-
tamination from entering and damaging the new motor.
3. Thoroughly cleanjunctionofhydraulichose and left
side elbow fitting on bottom of traction pump (Fig. 54).
Disconnect hose from left side pump fitting.
4. Connect Toro high flow hydraulic filter in series be-
tweentractionpumpfitting anddisconnectedhose.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.Otherf luidscouldcausesystem
damage.
5. After installing high flow filter to 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 s peed, 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 showing during operation.
8. With engine running at high idle speed and traction
pedalmovedtotheforwarddirection, periodically apply
brakes to increase pressure in traction circuit. While
monitoring filter indicator, continue this process for an
additional five (5) minutes.
IMPORTANT: If usinga filter that isnot the bi--direc-
tional Toro high flow filter, do not press the traction
pedal in the reverse direction. If flow is reversed
when using a filter that is not bi--directional, debris
from the filter will re--enter the traction circuit.
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.Shutengineoffandremovekey fromignition switch.
11.Removehighflowhydraulicfilter andhydraulic hose
kit from machine. Connect hydraulic hose to left s ide
tractionpumpfitting.Makesuretoproperlytightenhose
(seeHydraulicHoseandTubeInstallationin theGener-
al Information section of this chapter).
12.Lower machine to ground.
13.Checkoillevelinhydraulic reservoirandaddcorrect
oil if necessary.
1. Piston (traction) pump 2. Left side fitting/hose
Figure 54
FRONT
RIGHT
1
2
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