Traction Circuit Component Failure - Toro Groundsmaster 3280-D Service Manual

Traction Circuit Component Failure

Groundsmaster ® 3280-D/3320
05138SL Rev B
The traction circuit of the Groundsmaster 3280-D and 3320 machines is a
closed loop system that includes the hydraulic pump and hydraulic motor. If a
component failure occurs in the traction circuit (e.g., hydraulic pump or hydraulic
motor), unwanted material and contamination from the damaged component will
circulate throughout the traction circuit. This contamination can damage other
components in the circuit, so remove the contamination 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
filter when you connect hydraulic test gauges in order to test the traction circuit
components or after you replace a failed traction circuit component (e.g.,
hydraulic pump or hydraulic motor). Using a high flow hydraulic-fluid filter will
remove contaminates from the hydraulic fluid in the traction circuit, thereby
preventing additional component damage.
After you have installed the Toro high flow hydraulic-fluid filter in the traction
circuit, raise and support the machine with all the drive wheels off the ground.
Then, operate the traction circuit to allow the hydraulic fluid to flow through the
circuit. The filter removes contamination from the traction circuit during the
circuit operation. Because the Toro high flow filter is bi-directional, the traction
circuit can be operated in both the forward and reverse direction. When you are
certain that the filter has removed the contaminates from the hydraulic fluid of
the traction circuit, remove the filter. Refer to
Circuit (Machine Serial Number above 316000000) (page 5–82)
information on using the Toro high flow hydraulic-fluid filter.
The alternative method to remove contamination from the traction circuit is to
disassemble the entire traction circuit, drain the hydraulic fluid, and clean all the
components, tubes, and hoses in the traction circuit. Operating the machine
with contaminants in the traction circuit could cause additional damage to
components of the traction circuit.
Note: The hydraulic pump case drain could allow traction circuit contamination
to contaminate other hydraulic circuits on the machine.
5–42). Use a high flow hydraulic-fluid
Filtering the Closed-Loop Traction
Page 5–7
for additional
Hydraulic System: General Information