Traction Circuit Component Failure - Toro Groundsmaster 4300-D Service Manual

Traction Circuit Component Failure

Groundsmaster ® 4300-D
16226SL Rev C
The traction circuit of the Groundsmaster 4300-D machines is a closed loop
system that includes the piston (traction) pump and 4 wheel motors. If a
component failure occurs in the traction circuit (e.g., traction (piston) pump
or wheel 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 Special Tools (page
connect hydraulic test gauges in order to test the traction circuit components or
after you replace a failed traction circuit component (e.g., traction (piston) pump
or wheel 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
4–91) for additional 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.
4–31). Use a high flow hydraulic-fluid filter when you
Filtering the Closed-Loop Traction Circuit (page
Page 4–7 Hydraulic System: General Information