Mow Circuit Problems - Toro Groundsmaster 4100-D Service Manual

Mow Circuit Problems

Problem
Cutting deck will not operate.
NOTE: To engage the mow circuit,
the seat must be occupied, the trac-
tion speed must be in the Low
(4WD) position and the PTO switch
needs to be ON.
One cutting deck section will not op-
erate.
All cutting deck sections operate
slowly.
Cutting deck section stops under
load.
Hydraulic System
Possible Cause
Electrical problem exists (see Chapter 5 -- Electrical System).
Gear pump or its coupler is damaged (NOTE: other hydraulic circuits
impacted as well).
Electrical problem exists (see Chapter 5 -- Electrical System).
System pressure to the affected deck is low.
Woodruff key on affected deck motor is damaged.
Solenoid valve (S) in PTO manifold for affected deck is faulty.
Cartridge valve in PTO manifold for affected deck is damaged or
sticking.
Deck motor or gear pump section is damaged.
NOTE: If appropriate, transfer a suspected damaged deck motor to
another cutting deck section. If problem follows the motor, motor
needs repair or replacement.
Engine RPM is low.
Deck motor or gear pump sections are damaged.
Relief valve in PTO manifold for affected deck is by--passing.
Deck motor has internal leakage (by--passing oil).
Cutting deck gear pump section is worn or damaged.
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