Toro Groundsmaster 4000-D Service Manual page 71

Lift Circuit Problems
Problem
Cutting decks will not raise.
NOTE: Seat must be occupied in or-
der to raise cutting decks.
Cutting decks raise, but will not stay
up.
NOTE: Lift cylinders cannot provide
an absolutely perfect seal. The cut-
ting deck will eventually lower if left
in the raised position during storage.
Cutting decks will not lower.
NOTE: To lower a cutting deck, the
seat must be occupied and the trac-
tion speed must be in the Low
(4WD) position.
Groundsmaster 4000--D/4010--D
Possible Cause
Engine RPM is too low.
Hydraulic oil level in reservoir is low.
Solenoid valve (S1) in lift/lower manifold is faulty.
Electrical problem exists (see Chapter 5 -- Electrical System).
Lift arm pivots are binding.
Relief valve in lift/lower manifold is stuck.
Lift cylinder(s) is (are) damaged.
Gear pump section for lift circuit is inefficient (NOTE: steering circuit
impacted as well).
Lift circuit lines or fittings are leaking.
Lift cylinder is damaged.
Cartridge valve(s) in lift/lower manifold has damaged seals or is
faulty.
Lift arm pivots are binding.
Electrical problem exists (see Chapter 5 -- Electrical System).
Solenoid valve (S1) in lift/lower manifold is faulty.
Counterbalance pressure is excessive.
Lift cylinder is damaged.
Page 4 - - 33 Hydraulic System