Troubleshooting; General Hydraulic System Problems - Toro Groundsmaster 360 Service Manual

Troubleshooting

The chart that follows contains suggestions that can be
used to assist in diagnosing hydraulic system perfor-
mance issues. The suggestions are not all--inclusive.
Also, consider that there may be more than one cause
for a machine problem.

General Hydraulic System Problems

Problem
Hydraulic oil leaks from system.
Hydraulic fluid foams excessively
causing oil leakage from hydraulic
tank breather.
NOTE: Some aeration of hydraulic oil
on this machine is normal. This
aeration (foaming) may be more
noticeable after initial filling of
hydraulic tank.
Hydraulic system operates hot.
Groundsmaster 360
Review the hydraulic schematic included in Chapter 9 --
Foldout Drawings and information on hydraulic system
operation in the Hydraulic Flow Diagrams section of this
Chapter. This information will be useful during the hy-
draulic troubleshooting process.
Refer to the Testing section of this Chapter for precau-
tions and specific hydraulic test procedures.
Possible Causes
Fitting(s), hose(s) or tube(s) are loose or damaged.
O--ring(s) or seal(s) are missing or damaged.
Oil level in hydraulic tank is low.
Hydraulic system has wrong type of oil.
One of the pump suction lines has an air leak.
Incompatible hydraulic oils mixed in system.
Water in hydraulic system.
Transmission pressure is high due to load or dragging brakes.
Oil cooler air flow is obstructed.
Oil level in hydraulic tank is low or inlet filter is loose or clogged.
Oil is contaminated or oil viscosity is too light.
Oil cooler is damaged or plugged.
Transmission bypass valve(s) is open or defective.
Gear pump relief valve is stuck open.
Deck lift switch is held in the raise position for too long causing
hydraulic oil to be at relief pressures. An electrical problem could exist
with deck lift switch or circuit wiring that could cause excessive
hydraulic temperatures.
Transmission check valve is not seating or is damaged.
Charge pressure is low.
Transmission or wheel motor(s) is worn or damaged.
(NOTE: If one traction circuit component has internal wear or damage,
it is possible that other traction components are also damaged.)
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