General Information; Operator's Manual; Relieving Hydraulic System Pressure; Traction Circuit (Closed Loop) Component Failure - Toro Reelmaster 3100-D Service Manual

General Information

Operator's Manual

Relieving Hydraulic System Pressure

Traction Circuit (Closed Loop) Component Failure

Reelmaster ® 3100-D/3105-D
20252SL Rev A
The Operator's Manual provides information regarding the operation, general
maintenance procedures, and maintenance intervals for your machine. Refer to
the Operator's Manual for additional information when servicing the machine.
Before disconnecting or performing any work on the Reelmaster hydraulic
system, all pressure in the hydraulic system must be relieved. Park machine on
a level surface with the cutting units lowered and off. Turn key switch to OFF and
allow engine to stop.
To relieve hydraulic pressure in traction circuit, move traction lever to both
forward and reverse directions. To relieve hydraulic pressure in steering and lift
circuits, rotate steering wheel in both directions.
To relieve cutting system pressure, turn key switch to ON (engine not running).
Move PTO switch to engage which will energize the solenoid valve on hydraulic
manifold to relieve circuit pressure. Move PTO switch to disengage, return key
switch to OFF and remove key from the key switch.
To relieve lift circuit system pressure, turn key switch to ON (engine not running),
fully lower the cutting units to the ground. Turn key switch to OFF.
Note: Moving steering wheel with engine off may unseat implement relief valve.
If steering or lift circuits appear weak or inoperative after machine is returned to
service, repeat relieving hydraulic system pressure procedure.
The Reelmaster 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 contamination is removed from the circuit. If any debris remains in the
traction circuit and the machine is operated, the debris can cause additional
component failure.
An additional step for removing all traction circuit contamination would be to
temporarily install a high pressure hydraulic oil filter (refer to
2–13)) into the circuit. The filter could be used when connecting hydraulic test
gauges in order to test traction circuit components or after replacing a failed
traction circuit component (e.g. hydrostat 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 fluid 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 5–67)
this chapter for additional information on using the Toro high flow hydraulic filter.
in the Service and Repairs section of
Page 5–3
Special Tools (page
Filtering
Hydraulic System: General Information