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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