Toro 3000D manual Steering Circuit Test, Cylinder Test, Steering Valve Test

Steering Circuit Test

The steering and implement lift circuits are connected in series. If the implement lift operates correctly, the steer­ ing valve has adequate flow and pressure.

Cylinder Test

This test checks the steering cylinder for internal bypass, and assumes that the steering valve is working correctly. The Steering Valve Test will determine if the steering valve is faulty.

1.Make sure hydraulic oil is at normal operating temper- ature by operating the machine for approximately 10 minutes.

2.Lower cutting unit, engage parking brake and stop the engine.

3.Install a tee fitting and a 5,000 PSI (350 Bar) test gauge onto the right side steering cylinder fitting. Use parts from TOR4079 test fitting kit or the following Toro parts:

Cap (340–117)

Plug (340–116)

Tee (340–115)

Quick connect fitting (86–5480)

4.Start the engine and move the throttle control all the way forward. Rotate the steering wheel counterclock­ wise until the cylinder reaches the end of its travel. Con­ tinue rotating the steering wheel (without excessive force) while watching the pressure gauge. Pressure should be 1,100 PSI (76 Bar). If cylinder does not move, pressure is very low, or the steering wheel rotates easily, the internal seal may be bypassing in the cylinder.

Steering Valve Test

This test determines if the steering valve is working cor­ rectly. If this test is good and the first test is not, the prob­ lem is in the steering valve.

1.Make sure hydraulic oil is at normal operating temper- ature by operating the machine for approximately 10 minutes.

2.Lower cutting unit, engage parking brake and stop the engine.

3.Disconnect the tee from the cylinder. Install a cap on the cylinder and a plug on the open tee port.

4.Start the engine and move the throttle control all the way forward. Gently rotate the steering wheel while observing the pressure gauge. If the pressure now increases to 1,100 PSI (76 Bar), the cylinder has a dam­ aged internal seal. Repair or replace the cylinder. If the pressure does not increase by rotating in either direc­ tion, repair or replace the steering valve.

1

Figure 18

1. Right side steering cylinder fitting

Figure 19

Hydraulic System Page 5 – 16 Rev. A Groundsmaster 3000/3000–D