Lift Circuit Problems
Problem
Possible Causes
Single cutting deck raises slowly or not Cutting deck has excessive debris buildup.
at all
Lift arm or lift cylinder is binding.
Flow control orifice in lift control manifold for the affected cutting deck is
plugged, stuck or damaged.
Lift cylinder leaks internally.
Cutting decks raise, but will not remain Lift circuit hydraulic lines or fittings are leaking.
in the raised position
Air exists in lift circuit.
NOTE: Lift cylinders and control
manifold cartridge valves cannot
Lift cylinder leaks internally.
provide an absolutely perfect seal. The
Solenoid valve (S2) in lift control manifold leaks.
cutting decks will eventually lower if
left in the raised position.
None of the cutting decks will raise or Oil level in hydraulic reservoir is low (other hydraulic systems are
lower
affected as well).
NOTE: Mow speed limiter must be in
mow speed position in order to lower
the cutting decks.
An electrical problem exists that prevents lift control manifold solenoid
valve operation (see Troubleshooting in Chapter 5 -- Electrical System).
Solenoid valve PRV in lift control manifold is faulty.
Logic cartridge LC in lift control manifold is faulty.
Solenoid valve S2 in lift control manifold is faulty.
Gear pump section (P4) is worn or damaged.
Neither of the rear cutting decks will
raise or lower but the front cutting
decks will raise and lower
Flow control orifice in lift control manifold for the rear cutting decks
(port C8) is plugged, stuck or damaged.
Single cutting deck lowers very slowly Lift arm or lift cylinder is binding.
or not at all
Lift cylinder is damaged.
Flow control orifice in lift control manifold for the affected cutting deck is
plugged, stuck or damaged.
Groundsmaster 4300--D
Page 4 -- 29
Hydraulic System
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