Filtering Closed--Loop Traction Circuit
Filtering of a closed--loophydraulic system after amajor
component failure (e.g. traction (piston) 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--looptraction circuit, use ofthe Torohigh flow hy-
draulic filter and hydraulic hose kits are recommended
(see Special Tools in this chapter).
7. With engine running at low idle speed, slowly move
the traction pedal to the forward direction to allow flow
through thetractioncircuitandhighflowfilter.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
pedal moved to the forward direction, periodically apply
brakes to increase pressure in traction circuit. While
monitoring filter indicator, continue this process for an
additional five (5) minutes.
1.
Parkmachineonalevelsurfacewithenginestopped
and key removed from ignition switch.
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.
2.
ground (see Jacking Instructions in Chapter 1 -- Safety).
Raise and support machine so all wheels are off the
NOTE: If wheel motor was replaced, install high flow fil-
ter to the inlet of the new motor instead of to the traction
pump fitting. This will prevent system contamination
from entering and damaging the new wheel motor.
9. With engine running at high idle speed, alternately
movetractionpedalfromforwardtoreverse.Whilemon-
itoring filter indicator, continue this process for an addi-
tional five (5) minutes.
3.
side elbow fitting on bottom of traction pump (Fig. 63).
Disconnect hose from left side pump fitting.
Thoroughly clean junction of hydraulic hose and left
10.Shut
engine off and remove key from ignition switch.
4.
Connect Toro high flow hydraulic filter in series be-
tween traction pump fitting and disconnected hose. Use
hydraulic hose kit (see Special Tools in this chapter) to
connectfiltertomachine.Makesurethatfittingandhose
connections are properly tightened.
11.Remove high flow hydraulic filter and hydraulic hose
kit from machine. Connect hydraulic hose to left side
traction pump fitting. Make sure to properly tighten hose
(see Hydraulic Hose and Tube Installation in the Gener-
al Information section of this chapter).
IMPORTANT: Use only hydraulic fluids specified in
Operator’sManual.Otherfluidscouldcausesystem
damage.
12.Lower machine to ground.
13.Check
oil level in hydraulic reservoir and add correct
5.
fill hydraulic reservoir with new hydraulic oil as required.
After installing high flow filter to machine, check and
oil if necessary.
6.
draulic leakage from filter and hose connections. Cor-
rect any leaks before proceeding.
Start engine and run at idle speed. Check for any hy-
1
CAUTION
4
Allwheelswillbeoffthegroundandrotatingdur-
ing this procedure. Make sure machine is well
supported so it will not move and accidentally
fall to prevent injuring anyone around machine.
2
RIGHT
FRONT
3
5
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.
Figure 63
1.
2.
3.
Traction pump
4.
5.
LH elbow fitting
Hyd hose (reverse)
RH elbow fitting
Hyd hose (forward)
Hydraulic System
Page 4 -- 62
Groundsmaster 4300--D
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
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|
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| Language | English |
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