Lift/Lower Circuit Problems - Toro 04384 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.
Oil level in reservoir is low (other hydraulic circuits affected as well).
Lift cylinder linkage is binding or broken.
Lift cylinder bushings bind.
Charge circuit pressure is low (see Charge Relief Valve Pressure
Test).
Implement relief valve is leaking or damaged (see Implement Relief
Valve Pressure Test).
Solenoid valve (S2) in hydraulic manifold is leaking or damaged.
Relief valve (R2) is stuck, leaking or damaged (see Lower Cutting
Units Relief Valve (R2) Pressure Test).
Lift cylinders leak internally.
Spool in steering valve is hung up (see Steering Valve Test).
Gear pump (rear section) is worn or damaged (see Gear Pump
(Rear Section) Flow Test).
Hydraulic manifold solenoid valve (S4) leaks.
Lift cylinders leak internally.
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