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Groundsmaster 4100--D/4110--D Hydraulic SystemPage 4 -- 33
Mow Circuit Problems
Problem Possible Cause
None of the cutting deck sections
will operate.
NOTE: To engage the mow circuit,
theseatmustbeoccupied,thecut-
ting deck(s) must be fully lowered,
the traction speed must be in the
LOW (mow) position and the PTO
switch must be ON.
Electrical problem exists that prevents PRV solenoid valve in P TO
manifolds from being energized (see Chapter 5 -- Electrical Sys-
tem).
Front two (2) gear pump sections for mow circuits are worn or dam-
aged.
One cutting deck section will not op-
erate.
Electrical problem (e.g. solenoid coil in PTO manifold, cutting deck
position switch) exists (see Chapter 5 -- Electrical System).
Cutting deck section problem exists (e.g. drive belt, deck spindle).
System pressure to the affected cutting deck section is low.
Woodruff key on affected deck section motor is damaged.
Proportional relief valve (PRV) in PTO m anifold for affected deck sec-
tion is faulty.
Cartridge valve in PTO manifold for affected deck section is damaged
or sticking.
Deck motor for affected deck section is damaged (NOTE: if appropri-
ate, transfer a suspected damaged motor to another cutting deck. If
problem follows the motor, motor is faulty and needs repair or re-
placement).
Gear pump section for affected deck section is worn or damaged.
All cutting deck sections operate
slowly.
Engine RPM is low.
All deck motors are worn or damaged.
Front two (2) gear pump sections for mow circuits are worn or dam-
aged.
Cutting deck section stops under
load.
Proportional relief valve in PTO manifold for affected deck section
is by--passing.
Deck motor has internal leakage (by--passing oil).
Gear pump section for affected deck section is worn or damaged.
Hydraulic
System