Relieving Hydraulic System Pressure; Traction Circuit Component Failure - Toro Reelmaster 5010- H Service Manual

Relieving Hydraulic System Pressure

Before disconnecting or performing any work on the hy-
draulic system, all pressure in the hydraulic system
must be relieved. Park machine on a level surface, lower
cutting units fully, stop engine and engage parking
brake.
To relieve hydraulic pressure in lift circuit, start engine
and fully lower the cutting units. Turn key switch to OFF
and remove key from the ignition switch.

Traction Circuit Component Failure

The traction circuit on Reelmaster 5010- H series ma-
chines is a closed loop system that includes the piston
(traction) pump and two (2) front wheel motors (four (4)
wheel motors on machines equipped with optional
TM
CrossTrax AWD kit). If a component in the traction cir-
cuit 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.
The recommended method of removing traction circuit
contamination would be to temporarily install the Toro
high flow hydraulic filter (see Special Tools in this chap-
ter) into the circuit. This filter should be used when con-
necting hydraulic test gauges in order to test traction
circuit components or after replacing a failed traction cir-
cuit component (e.g. traction (piston) pump or wheel
motor). The filter will ensure that contaminates are re-
moved from the closed loop and thus, do not cause addi-
tional component damage.
Once the Toro high flow hydraulic filter kit has been
placed in the circuit, raise and support the machine with
Hydraulic System
To relieve hydraulic pressure in traction circuit, stop en-
gine and move traction pedal to both forward and re-
verse directions.
To relieve hydraulic pressure in steering circuit, stop en-
gine and rotate steering wheel in both directions.
all wheels off the ground. Then, operate the traction cir-
cuit to allow oil flow throughout the circuit. The filter will
remove contamination from the traction circuit during
operation. Because the Toro high flow filter is bi- direc-
tional, the traction circuit can be operated in both the for-
ward and reverse direction. The filter should be
removed from the machine after contamination has
been removed from the traction circuit. See Filtering
Closed- Loop Traction Circuit in the Service and Repairs
section of this chapter for additional information on us-
ing the Toro high flow hydraulic filter.
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 compo-
nents, hydraulic tubes and hydraulic hoses in the trac-
tion circuit. If any debris remains in the traction circuit
and the machine is operated, the debris can cause addi-
tional circuit component failure.
NOTE: The piston (traction) pump case drain could al-
low traction circuit contamination to contaminate other
hydraulic circuits on the machine.
Page 4 - 8 Reelmaster 5010- H