PRELIMINARY – For Toro Distributor and Toro Company use only. Relieving Hydraulic System Pressure Before disconnecting or performing any work on your Greensmaster hydraulic system, all pressure in the hydraulic system must be relieved. To relieve hydraulic pressure in the traction circuit, park machine on a level surface with the cutting decks lowered and off. Turn ignition switch to OFF and allow engine to stop. If machine is parked on an incline or slope, pressure in the traction circuit WILL NOT be relieved.
To relieve hydraulic pressure in the steering circuit, park machine on a level surface with the cutting units lowered and off. Turn ignition switch to OFF. After engine has come to a complete stop, rotate steering wheel in both directions. Hydraulic pressure in the mow circuit is relieved when the ignition switch is turned to OFF.
To relieve hydraulic pressure in lift circuit, fully lower the cutting units to the ground. Turn ignition switch to OFF and allow engine to stop. Make sure that after lowering, none of the cutting units are not being supported by the lift cylinders.
Traction Circuit Component Failure The traction circuit on your Greensmaster machine is a closed loop system that includes the piston (traction) pump and two (2) wheel motors (three (3) wheel motors are included if machine is equipped with optional 3WD kit). 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. The recommended method of removing traction circuit contamination would be to temporarily install the Toro high flow hydraulic filter (see Special Tools in this chapter) into the circuit. This filter should be used when connecting hydraulic test gauges in order to test traction circuit components or after replacing a failed traction circuit component (e.g. traction (piston) pump or wheel motor). The filter will ensure that contaminates are removed from the closed loop and thus, do not cause additional component damage.
Greensmaster 3300/3400
Once the Toro high flow hydraulic filter kit has been placed in the circuit, raise and support the machine with all drive wheels off the ground. Then, operate the traction circuit 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-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 Filtering Closed--Loop Traction Circuit in the Service and Repairs section of this chapter for additional information on using 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 components, 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 failure.
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Hydraulic System