Troubleshooting; General Hydraulic System Problems - Toro Groundsmaster 3280-D Service Manual

Troubleshooting

General Hydraulic System Problems

The hydraulic fluid is leaking from the system.
The hydraulic fluid foams excessively.
Note: Some aeration of the hydraulic fluid on this machine
is normal. This aeration (foaming) may be more noticeable
after initial filling of hydraulic reservoir (front axle).
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 found in
on the hydraulic system operation in the
This information will be useful during the hydraulic troubleshooting process.
Refer to Testing the Hydraulic System (page 5–47)
hydraulic test procedures.
Problem
Appendix A (page A–1)
Hydraulic Flow Diagrams (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 reservoir (front axle) 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 traction system pressure is high due to load or dragging
brakes.
• The hydraulic-fluid level in the reservoir (front axle) is low.
• 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 oil filter is plugged.
• The hydraulic pump bypass valve is open or damaged
(3280-D Models 30344 and 30345).
• The hydrostat/hydraulic pump check valve is not seating or
is damaged.
• The charge pressure is low.
• The hydrostat/hydraulic pump is worn or damaged.
• Engine RPM is too low.
Note: If 1 traction circuit component has internal wear or
damage, it is possible that the other traction components
are also damaged.
Page 5–44
and information
for precautions and specific
Possible Causes
Groundsmaster
05138SL Rev B
5–19).
® 3280-D/3320