Filter
Top Products
Greensmaster 3320/3420Hydraulic System Page 5 -- 48
Filtering Closed--Loop Traction Circuit
Filtering of a closed--loop hydraulic 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
systemfilteringtool isnotused toensure systemcleanli-
ness, repeat failures, as well as subsequent damage to
other hydraulic components in the affected system, will
occur. To effectively remove contamination from
closed--loop tractioncircuit, use ofthe Toro high flowhy-
draulic filter and hydraulic hose kits are recommended
(see Special Tools in this chapter).
1. Parkmachine on alevel surface withenginestopped
and key removed from ignition switch.
2. Raise and support machine so all wheels are off the
ground (see Jacking Instructions in Chapter 1 -- Safety).
NOTE: If wheel motor wasr eplaced, install high flow fil-
ter tothe inlet ofnew motor instead of topiston (traction)
pump fitting. This will prevent system contamination
from entering and damaging the new motor.
3. Thoroughly clean junction of hydraulic hose and
lowerfittingon sideof pistonpump(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
connectfilter tomachine. Makesure that fitting andhose
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
fill hydraulic reservoir with new hydraulic oil as required.
6. Start engine and run at idle speed. Check for any hy-
draulic leakage from filter and hose connections. Cor-
rect any leaks before proceeding.
CAUTION
Allwheels willbe offtheground androtating dur-
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, move func-
tional control lever to the transport position and slowly
move the tractionpedalto theforward direction. Thiswill
allow flow through the traction circuit and high flow filter.
Keep traction 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.
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.
9. With engine running at high idle speed, alternately
movetractionpedalfrom forward toreverse. Whilemon-
itoring filter indicator, continue this process for an addi-
tional five (5) minutes.
10.Shut engine off and remove key from ignition switch.
11.Removehighflowhydraulic filter and hydraulic hose
kit from machine. Connect hydraulic hose to lower pis-
ton (traction) pump fitting. Make sure to properly tighten
hose (see Hydraulic Hose and Tube Installation in the
General Information section of this chapter).
12.Lower machine to ground.
13.Check oil level in hydraulic reservoir and add correct
oil if necessary.
1. Piston (traction) pump 2. Lower fitting
Figure 32
2
1
PUMP FROM GREENSMASTER
3320 SHOWN