Lift/Lower Circuit Problems - Toro Greensmaster 3150 Service Manual

Lift/Lower Circuit Problems

Problem
Cutting units will not lift or lift slowly.
Cutting units raise, but will not stay
up.
Hydraulic System
Possible Cause
Engine speed is too low.
Hydraulic reservoir oil level is low.
Lift cylinder linkage is binding or broken.
Lift cylinder bushings are binding or worn.
Charge circuit pressure is low (see Charge Relief Valve Pressure
Test in the Testing section of this chapter).
Implement relief valve is leaking or damaged (see Implement Relief
Valve Pressure Test in the Testing section of this chapter).
Hydraulic manifold solenoid valve (S2) is leaking or damaged (not
shifting to its energized position).
Relief valve (R2) is leaking or damaged (see Lower Cutting Units
Relief Valve (R2) Pressure Test in the Testing section of this
chapter).
Lift cylinders leak internally.
Spool in steering control valve is hung up (see Steering Control
Valve Test in the Testing section of this chapter).
Gear pump (rear section) is worn or damaged (see Gear Pump
(Rear Section) Flow Test in the Testing section of this chapter).
Hydraulic manifold solenoid valve (S4) leaks or is damaged.
Lift cylinders leak internally.
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