Attachment Lift/Lower Problems - Toro Sand Pro 3040 Service Manual

Attachment Lift/Lower Problems

Problem
Lift cylinders will not raise or raise
slowly.
Lift cylinders raise but will not stay up.
NOTE: Lift cylinders cannot provide an
absolutely perfect seal. The lift arms
will eventually lower if left supporting
an attachment in the raised position
during storage.
Sand Pro ® 3040 and 5040
20251SL Rev A
Possible Cause
Engine speed is too low.
Lift arms are binding, worn or damaged.
The hydraulic fluid level in the hydraulic
tank is low (other hydraulic circuit
performance is affected as well).
The rear lift cylinder relief valve (model
08743 only) is faulty.
The steering relief valve (in the steering
control valve – model 08745 only) is
faulty.
Lift cylinder circuit pressure is low
(traction charge is affected and steering
circuit for model 08745 machines is
affected also).
The lift cylinder is leaking internally.
The lift valve is worn or damaged.
A lift cylinder is leaking internally.
The lift valve is worn or damaged.
Page 3–9
Corrective Action
Increase engine speed.
Inspect lift components and repair or
replace if necessary.
Adjust the hydraulic fluid level.
Verify the rear lift cylinder relief valve
operation; refer to Testing the Steering
and Lift Circuit – Rear Lift Cylinder
Relief Valve in the Hydraulic System
chapter of this manual.
Verify the steering relief valve operation;
refer to Testing the Steering and Lift
Circuit – Steering and Lift Circuit Relief
Valve in the Hydraulic System chapter
of this manual.
Verify charge pressure; refer to Testing
the Traction Circuit – Charge Pressure
in the Hydraulic System chapter of this
manual.
Verify charge pump performance; refer
to Testing the Steering and Lift Circuit
– Charge Pump Flow and Circuit Relief
Valve in the Hydraulic System chapter
of this manual.
Test and repair or replace the lift
cylinder if necessary.
Disassemble, clean, inspect and repair
or replace the lift valve.
Test and repair or replace the lift
cylinder if necessary.
Disassemble, clean, inspect and repair
or replace the lift valve.
Troubleshooting: Attachment Lift/Lower Problems