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

Steering and Lift/Lower Circuit Problems

Problem
Gear pump is noisy (cavitation).
Steering inoperative or sluggish.
Cutting deck will not lift or lifts slowly.
Cutting deck raises, but will not stay
up.
NOTE: Lift cylinder and solenoid valve
in deck lift manifold cannot provide an
absolutely perfect seal. The cutting
deck may eventually lower if left in the
raised position.
Groundsmaster 360
Possible Causes
Hydraulic tank oil level is low.
Hydraulic oil is very cold.
Suction line is restricted.
Suction line has an air leak.
Steering components (e.g. steering forks, steering arms, tie rods,
steering cylinder ends) are binding and need to be greased.
Steering components (e.g. steering forks, steering arms, tie rods,
steering cylinder ends) are worn or damaged.
Steering cylinder is binding (e.g. bent rod on steering cylinder).
Oil level in hydraulic reservoir is low (other hydraulic systems are
affected as well).
Implement relief valve in gear pump is stuck or damaged.
Steering cylinder leaks internally.
Steering cylinder internal re--phasing valve is stuck, worn or damaged.
Steering control valve is worn or damaged.
Gear pump is worn or damaged (NOTE: A worn or damaged gear
pump will also affect the deck lift circuit).
Engine speed is too low.
Cutting deck being raised during steering input (steering has priority).
Lift cylinder linkage is binding or broken.
Lift arm bushings are binding.
Hydraulic tank oil level is low.
Implement relief valve in gear pump is stuck or damaged.
Lift cylinder leaks internally.
Gear pump is worn or damaged (NOTE: A worn or damaged gear
pump will also affect the steering circuit).
Lift cylinder leaks internally.
Solenoid valve in lift control manifold port A leaks.
Page 4 - - 31 Hydraulic System