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

Troubleshooting

General Hydraulic System Problems

The hydraulic fluid is leaking from the system.
The hydraulic fluid foams excessively causing fluid leakage
from the hydraulic tank breather.
Note: Some aeration of the hydraulic fluid on this machine
is normal. This aeration (foaming) may be more noticeable
after initial filling of hydraulic tank.
The hydraulic system operates hot.
Hydraulic System: Troubleshooting
The following chart contains suggestions that can be used to solve performance
issues specific to the hydraulic system. The suggestions are not all-inclusive.
There can be more than 1 cause for a machine malfunction.
Review the hydraulic schematic in
and information on the hydraulic system operation in the
Diagrams (page 4–14). This information will be useful during the hydraulic
troubleshooting process.
Refer to Testing the Hydraulic System (page 4–39)
hydraulic test procedures.
Problem
Appendix A (page
• The fitting(s), hose(s), or tube(s) are loose or damaged.
• The O-ring(s) or seal(s) are missing or damaged.
• The hydraulic-fluid level in the hydraulic tank is low.
• The hydraulic system has a wrong type of fluid.
• One of the pump suction lines has an air leak.
• Incompatible hydraulic fluids are mixed in the system.
• There is water in the hydraulic system.
• The transmission pressure is high due to load or dragging
brakes.
• The hydraulic-fluid level in the hydraulic tank is low or the
inlet filter is loose or clogged.
• The hydraulic fluid is contaminated or the fluid viscosity
is too light.
• The oil cooler is damaged or plugged.
• The oil cooler air flow is obstructed.
• The transmission bypass valve(s) is open or damaged.
• The gear pump relief valve is stuck open.
• The deck lift switch is held in the R
causing hydraulic fluid to be at relief pressures. An electrical
problem could exist with the deck lift switch or circuit wiring
that could cause excessive hydraulic temperatures.
• The transmission check valve is not seating or is damaged.
• The charge pressure is low.
• The transmission or wheel motor(s) is worn or damaged.
Note: If 1 traction circuit component has internal wear or
damage, it is possible that the other traction components
are also damaged.
Page 4–34
A–1)—Foldout Drawings
Hydraulic Flow
for precautions and specific
Possible Causes
position for too long
AISE
Groundsmaster 360
16225SL Rev C