Traction Circuit Problems (Continued)
Problem
Possible Causes
Wheel motor will not turn
Brakes are binding.
Wheel motor is worn or damaged (NOTE: If a traction circuit
component has internal wear or damage, it is possible that other
traction circuit components are also damaged).
Wheel motors will not hold load when Charge pressure is low.
traction pedal is in neutral
Valve plate and/or piston shoes in piston (traction) pump are scored
(NOTE: If a traction circuit component has internal wear or damage, it
is possible that other traction circuit components are also damaged).
Mow Circuit Problems
Problem
Possible Causes
Front cutting deck motors will not
operate but rear cutting deck motors
will operate
Solenoid valve PRV2 on deck control manifold is faulty (NOTE:
Solenoid valves PRV1 and PRV2 are identical and can be reversed for
testing purposes).
An electrical problem exists that prevents PRV2 solenoid coil on deck
control manifold from being energized (see Troubleshooting in Chapter
5
-- Electrical System).
Front deck spindle(s) is binding.
Gear pump section (P2) is worn or damaged.
Rear cutting deck motors will not
operate but front cutting deck motors
will operate
Solenoid valve PRV1 on deck control manifold is faulty (NOTE:
Solenoid valves PRV1 and PRV2 are identical and can be reversed for
testing purposes).
An electrical problem exists that prevents PRV1 solenoid coil on deck
control manifold from being energized (see Troubleshooting in Chapter
5
-- Electrical System).
Rear deck spindle(s) is binding.
Gear pump section (P1) is worn or damaged.
Cutting deck motor is worn or damaged.
Single cutting deck motor will not
operate or rotates slowly
Cross-over relief valve in cutting deck motor is stuck or faulty.
NOTE: If appropriate, transfer a suspected damaged motor to another
cutting deck. If problem follows the motor, motor needs repair or
replacement.
Hydraulic System
Page 4 -- 28
Groundsmaster 4300--D
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