Toro Dingo TX 413 - Fluids; Hydraulic Fluids; Viscosity; Excessive Fluid Temperature

HYDRAULIC TROUBLESHOOTING
11-2 TX 413 Service ManualRev. 001
Hydraulic Fluids
Fluids
The reservoir acts as an expansion chamber and
separates trapped air within the uid.
When checking the reservoir level, examine the con-
dition of the uid. The presence of dirt and or metallic
particles indicate a uid and lter change along with
further system troubleshooting is needed.
Viscosity
Viscosity is a measure of a uid's resistance to ow.
Fluids with high viscosity resist motion due to internal
friction and low viscosity uids ow easily when in
motion.
Fluid too thin
• Creates leakage past seals
• Proper pressure not maintained
Fluid too thick
• Sluggish operation
• Increased pump loading to ow oil
• High cold uid pressure can fail seals and gaskets
Excessive Fluid Temperature
Continuous Operation at Relief Pressure
Incorrect Fluid
• Drain, ush and replace with proper uid
Low Fluid Level
• Fill reservoir to the full mark
• Check system for external leaks
Contaminated Fluid
• Drain, ush and ll with clean uid
• Determine source of contamination
Excessive Engine Speed
• Adjust rpm’s to specication
Incorrect Relief Valve Pressure Setting
• Check and adjust pressure
• Clean or replace relief valve
Internal Component Fluid Leakage
• Inspect and test valves, cylinder, pumps and
motors for internal leakage
• Locate and repair faulty component(s)
Pump Suction Line Restriction
• Clean and or replace suction hose(s)
Pinched, Dented and or Obstructed Hydraulic Lines
• Clean and or replace affected hydraulic lines
Control Valve Partially or Fully Open
• Free spools to allow them to return to neutral
Heat not Dissipating
• Clean dirt and debris from hydraulic lines,
components, oil cooler and reservoir
• Excessive internal leakage