Steering Circuit Problems - Toro Greensmaster 3150 Service Manual

Steering Circuit Problems

Problem
Steering wheel is hard to turn.
Regular adjustments to steering
wheel are necessary because of dif-
ficulty of driving in a straight line.
Steering wheel will not return to the
neutral position.
Steering wheel can turn on its own.
Backlash results when turning steer-
ing wheel.
Rear wheel shimmies when the
steering wheel is turned.
The steering wheel can be turned
without the rear wheel turning.
Steering response is too slow and
heavy when trying to turn quickly.
Turning steering wheel turns ma-
chine in the opposite direction.
Steering force (possibly to one side
only) is insufficient.
Greensmaster 3150
Possible Cause
Oil supply to the steering control valve is insufficient (traction
charge and lift circuits affected as well).
Emergency steering ball in steering control valve is missing or
damaged.
Leaf springs in steering control valve are worn or broken.
Gear wheel set in steering control valve is worn.
Steering cylinder is seized or its piston seals are worn (see Steer-
ing Control Valve Test in the Testing section of this chapter).
Spool and sleeve are sticking to steering control housing assembly
(see Steering Control Valve Test in the Testing section of this
chapter).
Leaf springs in steering control valve are broken or stuck.
Spool and sleeve are sticking to steering control housing assembly
(see Steering Control Valve Test in the Testing section of this
chapter).
Cardan shaft fork is worn or broken.
Leaf springs in steering control valve are worn or broken.
Air is in the steering cylinder.
Mechanical connections to the wheel or wheel bearing are worn.
The steering cylinder is worn.
The gear set in the steering control valve is worn.
Oil supply to the steering control valve is insufficient (traction
charge and lift circuits affected as well).
Hoses to the steering cylinder are reversed.
Hydraulic flow to steering control valve is low (traction charge and
lift circuits affected as well).
Implement relief valve is leaking or damaged (see Implement Relief
Valve Pressure Test in the Testing section of this chapter).
Page 4 - - 25 Hydraulic System