Lift Circuit Problems - Toro Reelmaster 5010- H Service Manual

Traction Circuit Problems (Continued)
Problem
Wheel motor will not turn

Lift Circuit Problems

Problem
Single cutting unit lifts slowly or not
at all
Cutting units raise, but will not re-
main in the raised position
(NOTE: Lift cylinders and control
manifold check valves cannot pro-
vide an absolutely perfect seal. The
cutting units will eventually lower if
left in the raised position)
None of the cutting units will raise or
lower
Reelmaster 5010- H
Possible Cause
Brakes are binding.
Wheel motor is worn or damaged.
(NOTE: If a traction circuit component has internal wear or dam-
age, it is possible that other traction components are also dam-
aged)
Possible Cause
Affected cutting unit has excessive debris buildup.
Lift arm or lift cylinder for the affected cutting unit is binding.
Pilot piston in lift control manifold for the affected cutting unit is
stuck or damaged.
Lift cylinder for the affected cutting unit leaks internally.
Flow control orifice in lift control manifold for the affected cutting
unit is plugged or damaged.
Lift cylinder leaks internally.
Lift control manifold check valve(s) (CV1, CV4, CV5 and CV23)
and solenoid valve (SV1 and SV3) leaks.
Pilot piston in lift control manifold is stuck and is preventing check
valve from seating.
Oil level in hydraulic reservoir is low (other hydraulic systems af-
fected as well).
Cutting units are in the backlap position (NOTE: Operator advisory
should be displayed on InfoCenter Display).
Solenoid valve SVRV on lift control manifold is faulty.
An electrical problem exists that prevents SVRV solenoid coil on
the lift control manifold from being energized (see Troubleshooting
in Chapter 5 - Electrical System).
Gear pump section for lift/lower function (P1) is worn or damaged.
Page 4 - 27 Hydraulic System