Toro Groundsmaster 3505-D Service Manual page 53

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