Traction Circuit (Closed Loop) Component Failure - Toro Groundsmaster 3500-D Service Manual

Traction Circuit (Closed Loop) Component Failure

The Groundsmaster 3500--D traction circuit is a closed
loop system that includes the hydrostat and two (2)
wheel motors. 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.
If a component failure occurs in the traction circuit, it is
critical that the entire traction circuit be disassembled,
drained and thoroughly cleaned to ensure that all con-
tamination is removed from the circuit. If any debris re-
mains in the traction circuit and the machine is operated,
the debris can cause additional component failure.
An additional step for removing all traction circuit con-
tamination would be to temporarily install a high pres-
sure hydraulic oil filter (see Special Tools) into the circuit.
The filter could be used when connecting hydraulic test
gauges in order to test traction circuit components or af-
ter replacing a failed traction circuit component (e.g. hy-
drostat or wheel motor). The filter will ensure that
contaminates are removed from the closed loop and
thus, do not cause additional component damage.
Hydraulic System (Rev. D)
Once the filter has been placed in the traction circuit,
place the machine on jack stands and operate the trac-
tion circuit to allow oil flow through the circuit. With the
machine raised off the ground, the traction circuit will
have maximum oil flow at minimum pressure to mini-
mize damage from any remaining contamination. The
filter will remove contamination from the closed loop
traction circuit during operation. Remove the filter from
the machine after contamination has been removed
from the traction circuit.
IMPORTANT: When operating the traction system with
the high pressure filter installed, make sure that flow is
always directed through the filter (e.g. do not press the
traction pedal in the reverse direction if the filter is placed
for forward direction flow). If flow is reversed, debris
from the filter will re--enter the traction circuit.
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