Toro 30821 Service Manual page 69

Problem
Wheel motor will not turn.
Wheel motor will not hold load in
neutral.
Cutting unit gear pump (P1) is noisy
(cavitation).
Blades will not turn.
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 3500- 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 motor has internal leakage or malfunctioning cross- over
relief valve (see Testing).
Spindle bearing(s) are damaged.
Engine speed is too low.
Lift cylinder linkage is binding or broken.
Lift cylinder bushings are binding.
Reservoir oil level is low.
Charge pump (P2) pressure or flow is insufficient.
Charge pump (P2) is damaged.
Implement relief valve (1000 PSI) is stuck open.
Lift cylinders leak internally.
Steering control valve is defective.
Lift cylinders leak internally.
Check valve within the lift control valve leaks.
See Ross Troubleshooting Guide in the Hydraguide
Steering System HGF Series Service Procedure or Sauer/Danfoss
Steering Unit Type OSPM Service Manual at the end of this chap-
ter.
Hoses to the steering cylinder are reversed.
Page 4 - 29
Hydrostatic
TM
Hydraulic System (Rev. G)