Toro Groundsmaster 4000-D Service Manual page 64

Problem
Cutting decks will not raise.
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.
Front cutting deck drops too fast or
too slow.
Cutting decks will not lower.
Hydraulic System
Possible Causes
Engine RPM is too low.
Hydraulic oil level in reservoir is low.
Lift arm pivots are binding.
Relief valve in lift/lower control valve is stuck.
Pilot valve in lift/lower control valve is damaged or sticking.
Lift cylinder(s) is (are) damaged.
Gear pump section for lift/lower control valve is inefficient.
Lift circuit lines or fittings are leaking.
Lift cylinder is damaged.
Detents in lift/lower control valve are worn.
Flow control valve is not adjusted properly.
Lift arm pivots are binding.
Counterbalance pressure is excessive.
Pilot valve in lift/lower control valve is damaged or sticking.
Lift cylinder is damaged.
Lift/lower control valve is worn or damaged.
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