Steering And Lift/Lower Circuit Problems - Toro Groundsmaster 360 Service Manual

Steering and Lift/Lower Circuit Problems

The gear pump is noisy (cavitation).
Steering is sluggish or does not operate.
The cutting deck does not lift or lifts slowly.
The cutting deck raises, but does not stay up.
Note: The lift cylinder and solenoid valve S1 in the deck lift
manifold cannot provide an absolutely perfect seal. The
cutting deck will eventually lower if left in the raised position.
Hydraulic System: Troubleshooting
Problem
• The hydraulic-fluid level in the hydraulic tank is low.
• The hydraulic fluid is very cold.
• The suction line is restricted.
• There is an air leak in the suction line.
• The steering components (e.g., steering forks, steering
arms, tie rods, steering cylinder ends) are binding and need
to be greased.
• The steering components (e.g., steering forks, steering
arms, tie rods, steering cylinder ends) are worn or damaged.
• The steering cylinder is binding (e.g., bent rod on the
steering cylinder).
• The hydraulic-fluid level in the hydraulic reservoir is low
(other hydraulic systems are affected as well).
• The implement relief valve in the gear pump is stuck or
damaged.
• The steering cylinder is leaking internally.
• The steering cylinder internal re-phasing valve is stuck,
worn, or damaged.
• The steering control valve is worn or damaged.
• The gear pump is worn or damaged.
Note: A worn or damaged gear pump will also affect the
lift/lower circuit
• The engine speed is too low.
• The cutting deck being raised during steering input (steering
has priority).
• The lift cylinder linkage is binding or broken.
• The lift arm bushings are binding.
• The hydraulic-fluid level in the hydraulic tank is low.
• The implement-relief valve (in the gear pump) is stuck or
damaged.
• The lift cylinder is leaking internally.
• The deck lift manifold valves are worn or damaged.
• The gear pump is worn or damaged.
Note: A worn or damaged gear pump will also affect the
steering circuit.
• The lift cylinder is leaking internally.
• Solenoid valve S1 in the deck lift manifold is leaking.
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Possible Causes
Groundsmaster 360
16225SL Rev C