Toro 03781, Service Manual

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Reelmaster 7000−D Hydraulic System Page 5 − 4
Relieving Hydraulic System Pressure
Before disconnecting or performing any work on the hy-
draulic system, pressure in all of the hydraulic circuits
must be relieved.
1. Park machine on a level surface, lower cutting units
fully, set the reel enable/disable switch to the OFF posi-
tion, stop engine and apply parking brake.
2. Move the traction pedal in both forward and reverse
directions (relieves pressure in traction circuit).
3. Rotate steering wheel in both directions (relieves
pressure in steering and lift circuit).
NOTE: Pressure in the mow circuit is relieved automat-
ically when the cutting units are disengaged.
Traction Circuit Component Failure
The traction circuit on Reelmaster 7000−D machines is
a closed loop system that includes the piston (traction)
pump, two (2) front wheel motors and the rear axle mo-
tor. 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 system and do not cause
additional component damage.
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. Operate the traction cir-
cuit to allow oil flow throughout the circuit. The filter will
remove contamination from the traction circuit during
operation. Because the Toro high flow filter is bi−direc-
tional, the traction circuit can be operated in both the for-
ward 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 this chapter for addi-
tional information on using 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.
NOTE: If traction circuit contamination exists, the trac-
tion pump case drain could allow contaminates to enter
other hydraulic circuits on the machine.