Filtering Closed- Loop Traction Circuit - Toro Reelmaster 7000-D Service Manual

Filtering Closed- Loop Traction Circuit

Filtering of a closed- loop hydraulic system after a major
component failure (e.g. traction (piston) pump or front
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 wheels are off the
ground.
NOTE: If front wheel or rear axle motor was replaced,
install high flow filter to the inlet (when traveling forward)
of new motor instead of to the traction pump fitting. This
will prevent system contamination from entering and
damaging the new motor.
3. Thoroughly clean junction of hydraulic hose and
right side fitting on bottom of traction pump (Fig. 49).
Disconnect hose from right side pump fitting.
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
connect filter to machine. Make sure that fitting and hose
connections are properly tightened.
IMPORTANT: Use only hydraulic fluids specified in
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.
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.
Hydraulic System
7. With engine running at low idle speed, slowly move
the traction pedal to the forward direction to allow flow
through the traction circuit and high flow filter. Keep trac-
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.
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
move traction pedal from forward to reverse. While mon-
itoring filter indicator, continue this process for an addi-
tional five (5) minutes.
10.Shut engine off and remove key from ignition switch.
11. Remove high flow hydraulic filter and hydraulic hose
kit from machine. Connect hydraulic hose to right 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).
12.Lower machine to ground.
13.Check oil level in hydraulic reservoir and add correct
oil if necessary.
1
2
1. Piston (traction) pump
Page 5 - 90
RIGHT
FRONT
Figure 49
2. Right side fitting/hose
Reelmaster 7000- D