Service Manual

Groundsmaster 360Hydraulic System Page 4 − 58
Filtering Closed−Loop Traction Circuit
Filtering of a closed−loop hydraulic system after a major
component failure (e.g. transmission piston pump or
wheel motor) is a requirement to prevent debris from
transmitting throughout the system. If a closed−loop hy-
draulic system filtering tool is not used to ensure system
cleanliness, repeat failures, as well as subsequent dam-
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. Park machine on a level surface with engine stopped
and key removed from ignition switch.
WARNING
Before jacking up the machine, review and follow
Jacking Instructions in Chapter 1 − Safety.
2. Raise and support machine so all drive wheels are
off the ground (see Jacking Instructions in Chapter 1 −
Safety). On 2WD machines, chock non−drive (front)
wheels remaining on ground.
NOTE: If wheel motor was replaced, install high flow fil-
ter to the inlet of new motor instead of to the transmis-
sion. This will prevent system contamination from
entering and damaging the new wheel motor.
3. Thoroughly clean area surrounding traction circuit
hoses on top of transmission (Fig. 44 or 45). Determine
which piston pump circuit is to be filtered.
4. Disconnect hydraulic hose from transmission pump
inlet fitting for piston pump to be filtered (Fig. 44 or 45):
Piston Pump to be Filtered
Pump Inlet
Right Side Pump Port B
Left Side Pump Port D
5. Connect Toro high flow hydraulic filter in series be-
tween pump inlet fitting and the disconnected hose. Use
hydraulic hose kit (see Special Tools in this chapter) to
connect filter to machine. Make sure that hose connec-
tions are properly tightened.
6. Disconnect balancing hose from transmission fitting
closest to transmission pump inlet for pump to be filtered
(Fig. 44 or 45). Install steel cap on fitting and steel plug
in balancing hose.
Figure 44
2WD Machines
Port C
Port D
Port B
Port A
Balancing Hose
Figure 45
Port C
Port D
Port B
Port A
Balancing Hose
Balancing Hose
4WD Machine
IMPORTANT: Use only hydraulic fluids specified in
Operator’s Manual. Other fluids could cause system
damage.
7. After installing high flow filter to machine, check and
fill hydraulic reservoir with new hydraulic oil as required.
8. Start engine and run at low idle speed (1300 RPM).
Check for any hydraulic leakage from filter and hose
connections. Correct any leaks before proceeding.
CAUTION
The drive wheels will be off the ground and rotat-
ing during this procedure. Make sure machine is
well supported so it will not move and accidental-
ly fall to prevent injuring anyone around ma-
chine.