Greensmaster 3250--DHydraulic System Page 4 -- 54
Filtering Closed--Loop Traction C ircuit
Filteringofa closed--loophydraulicsystemafteramajor
component failure (e.g. piston (traction) pump or wheel
motor) is a requirement to prevent debris from transmit-
ting throughout the system. If a closed--loop hydraulic
systemfilteringtoolisnotusedtoensuresystemcleanli-
ness, repeat failures, as well as 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 machine so all driven wheels are off the
ground. Support raised machine with appropriate jack-
stands.
NOTE: If wheelm otor wasreplaced,installhighflowfil-
tertotheinletofnewmotorinsteadoftopiston(traction)
pump fitting. This will prevent system contamination
from entering and damaging the new motor.
3. Thoroughly clean junction of hydraulic hose and
lowerfittingonsideofpistonpump(Fig.32).Disconnect
hose from lower pump fitting.
4. Connect Toro high flow hydraulic filter in series be-
tweenpistonpumpfittinganddisconnectedhose.Use
hydraulic hose kit (see Special Tools in this chapter) to
connectfiltertomachine.Makesurethatfittingandhose
connections are properly tightened.
IMPORTANT: Use only hydraulic fluids specified in
Traction Unit Operator’s Manual. Other fluids could
cause system damage.
5. After installing high flow filter to machine, check and
fillhydraulicreservoirwith newhydraulicoil as required.
6. Start engine andrunatidlespeed. Check for anyhy-
draulic leakage from filter and hose connections. Cor-
rect any leaks before proceeding.
CAUTION
Alldrivenwheels willbeoff thegroundand rotat-
ing during this operation. Make sure machine is
wellsupportedsoitwillnotmoveandaccidental -
ly fall.
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
thetractionpedaltotheforward 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.
IMPORTANT: If using a filter that is not 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.
8. With engine running at high idle speed, alternately
movetractionpedalfromforwardtoreverse.Whilemon-
itoring filter indicator, continue this process for an addi-
tional five (5) minutes.
9. Shut engine offandremovekeyf rom ignitionswitch.
10.Remove high flow hydraulic filter and hydraulic hose
kit from machine. Connect hydraulic hose to lower pis-
ton(traction)pumpfitting.Makesureto properly tighten
hose (see Hydraulic Hose and Tube Installation in the
General Information section of this chapter).
11.Lowermachinetoground.
12.Check oillevelinhydraulic reservoir andaddcorrect
oil if necessary.
1. Piston pump 2. Lower hydraulic hose
Figure 32
2
1
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