Traction Circuit Component Failure - Toro Groundsmaster 4500-D Series Service Manual

Traction Circuit Component Failure

Groundsmaster ® 4500-D/4700-D
19245SL Rev A
The traction circuit on Groundsmaster 4500−D and 4700−D machines is a
closed loop system that includes the piston (traction) pump, two (2) front wheel
motors and the rear axle motor. If a component in the traction circuit should fail,
debris and contamination from the failed component will circulate throughout the
traction circuit. This contamination can damage other components in the circuit
so it must be removed to prevent additional component failure.
The recommended method of removing traction circuit contamination would be
to temporarily install the Toro high flow hydraulic filter (see
2–16)) into the circuit. This filter should be used when connecting hydraulic test
gauges in order to test traction circuit components or after replacing a failed
traction circuit component (e.g. traction (piston) pump or wheel motor). The filter
will ensure that contaminates are removed from the closed loop and thus, 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 wheels off the ground. Then, operate the
traction circuit 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−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
Closed−Loop Traction Circuit (page 5–93)
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
components, hydraulic tubes and hydraulic hoses in the traction circuit. If any
debris remains in the traction circuit and the machine is operated, the debris can
cause additional circuit component failure.
for additional information on using the
Page 5–5
Special Tools (page
Filtering
Hydraulic System: General Information