Relieving Hydraulic System Pressure; Opening Electrical Circuit To Cutting Units; Traction Circuit Component Failure - Toro Greensmaster TriFlex 3320/3420 Service Manual

Relieving Hydraulic System Pressure

Before disconnecting or performing any work on your
Greensmaster hydraulic system, all pressure in the hy-
draulic system must be relieved.
To relieve hydraulic pressure in the traction circuit, park
machine on a level surface with the cutting units lowered
and off. Turn ignition switch to OFF and allow engine to
stop. If machine is parked on an incline or slope, pres-
sure in the traction circuit WILL NOT be relieved.

Opening Electrical Circuit to Cutting Units

CAUTION
Before installing, removing or servicing the cut-
ting units, separate the cutting unit power dis-
connect. This will prevent unexpected cutting
unit operation.
Before installing, removing or working on the cutting
units, disconnect the cutting units from the electrical
power supply by separating the cutting unit power dis-
connect couplers (Fig. 3). The couplers are located at
the base of the rollover bar on the left side of the traction
unit. Connect the couplers together before operating the
machine.

Traction Circuit Component Failure

The traction circuit on your Greensmaster machine is a
closed loop system that includes the piston (traction)
pump and two (2) wheel motors (three (3) wheel motors
are included if machine is equipped with optional 3WD
kit). If a component in the traction circuit should fail, de-
bris and contamination from the failed component will
circulate throughout the traction circuit. This contamina-
tion can damage other components in the circuit so it
must be removed to prevent additional component fail-
ure.
The recommended method of removing traction circuit
contamination would be to temporarily install the Toro
high flow hydraulic filter (see Special Tools in this chap-
ter) into the circuit. This filter should be used when con-
necting hydraulic test gauges in order to test traction
circuit components or after replacing a failed traction cir-
cuit component (e.g. traction (piston) pump or wheel
motor). The filter will ensure that contaminates are re-
moved from the closed loop and thus, do not cause addi-
tional component damage.
Greensmaster 3320/3420
To relieve hydraulic pressure in lift circuit, fully lower the
cutting units to the ground. Turn ignition switch to OFF
and allow engine to stop. Make sure that after lowering,
none of the cutting units are not being supported by the
lift cylinders.
To relieve hydraulic pressure in the steering circuit, park
machine on a level surface with the cutting units lowered
and off. Turn ignition switch to OFF. After engine has
come to a complete stop, rotate steering wheel in both
directions.
1. Coupler
Once the Toro high flow hydraulic filter kit has been
placed in the circuit, raise and support the machine with
all drive wheels off the ground. Then, operate the trac-
tion circuit to allow oil flow throughout the circuit. The fil-
ter will remove contamination from the traction circuit
during operation. Because the Toro high flow filter is bi--
directional, the traction circuit can be operated in both
the forward and reverse direction. The filter should be
removed from the machine after contamination has
been removed from the traction circuit. See Filtering
Closed--Loop Traction Circuit in the Service and Repairs
section of this chapter for additional information on us-
ing the Toro high flow hydraulic filter.
The alternative to using the Toro high flow hydraulic filter
kit after a traction circuit component failure would be to
disassemble, drain and thoroughly clean all compo-
nents, tubes and hoses in the traction circuit. If any de-
bris remains in the traction circuit and the machine is
operated, the debris can cause additional circuit compo-
nent failure.
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2
Figure 3
2. Stationary coupler
Hydraulic System