Traction Circuit Component Failure - Toro Sand Pro 3040 Service Manual

Traction Circuit Component Failure

Sand Pro ® 3040 and 5040
20251SL Rev A
The traction circuit of the Sand Pro machines is a closed loop system that
includes the hydraulic pump, three hydraulic wheel motors, and a remotely
mounted relief valve. If a component in the traction circuit should fail,
unwanted material and contamination from the damaged component will
circulate throughout that traction circuit. This contamination can damage other
components in that circuit. The contamination must be removed as soon as
possible to prevent additional component failure.
The recommended method to remove contamination from the traction circuit is to
temporarily install a Toro high flow hydraulic-fluid filter into the circuit; refer to
High Flow Hydraulic Filter Kit (page
the filter should be installed before connecting hydraulic test gauges to test
traction circuit components or after replacing a failed traction circuit component.
The filter will ensure that contaminates are removed from the closed-loop traction
circuit and thus, prevent additional component damage. Refer to
Closed-loop Traction Circuit (page 5–59)
Toro high flow hydraulic filter.
Note: If traction circuit contamination exists, the traction pump case drain could
allow contaminates to enter the hydraulic tank.
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 the
components, the hydraulic tank, and the hydraulic tubes and 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 failures.
2–17). If a traction circuit failure is suspect,
for additional information on using the
Page 5–5
Filtering the
Hydraulic System: General Information