Problem
Possible Cause
Wheel motor will not turn.
Brakes are binding.
Key on wheel motor shaft is sheared or missing.
Internal parts in wheel motor are damaged.
Wheel motor will not hold load in
neutral.
Make up fluid from charge pump is not available.
Hydrostat ball check valves are damaged.
Reservoir oil level is low.
Cutting unit gear pump (P1) is noisy
(cavitation).
Suction line is restricted.
Suction line has an air leak.
Cutting blades will not turn.
Solenoid valve (R1) is stuck open.
An electrical problem exists (See Chapter 5 -- Electrical System).
Gear pump (P1) is damaged.
Cutting blades(s) turn too slowly.
Gear pump (P1) is inefficient (see Testing).
Cutting deck motor has internal leakage or malfunctioning cross--
over relief valve (see Testing).
Cutting deck spindle bearing(s) is (are) damaged.
Engine speed is too low.
Cutting units will not lift or lift slowly.
Lift cylinder linkage is binding or broken.
Lift arm bushings are binding.
Reservoir oil level is low.
Charge pump (P2) pressure or flow is insufficient.
Charge pump (P2) is damaged.
Implement relief valve (in steering control valve) is stuck open.
Lift cylinders leak internally.
Lift control valve is defective.
Lift cylinders leak internally.
Cutting units raise, but will not stay
up.
Check valve within the lift control valve leaks.
Steering Problems.
See Sauer/Danfoss Steering Unit Type OSPM Service Manual at
the end of this chapter.
Turning steering wheel turns ma-
chine in the opposite direction.
Hoses to the steering cylinder are reversed.
Groundsmaster 3505--D
Page 4 -- 23 Rev. B
Hydraulic System
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