Bobcat T190: No Down Pressure Issue

[MikePhua]

A user experienced a problem with their Bobcat T190 skid steer loader where the machine would not produce any down pressure. This issue caused concern as the loader’s attachments, which rely on hydraulic down pressure for proper operation, were not functioning correctly. The machine would not lift or operate as expected.
Possible Causes:
Several possible causes were discussed for the lack of down pressure, including:

1. Hydraulic System Issues:
   • A primary concern was whether the hydraulic pump was functioning properly.
     
   • A blockage in the hydraulic lines, particularly in the down-pressure line, could restrict flow.
     
   • The condition of the hydraulic fluid and whether it was clean and at the correct level was another potential factor.
     
2. Hydraulic Relief Valve:
   • The hydraulic relief valve may be faulty, causing the down pressure function to fail.
     
   • The relief valve could be stuck or incorrectly calibrated, allowing pressure to escape and preventing the attachment from functioning properly.
     
3. Solenoid or Control Valve Problems:
   • The solenoid or control valve responsible for directing hydraulic fluid to the proper areas might be malfunctioning. This could result in the down-pressure function not engaging correctly.
     
4. Electrical or Wiring Issues:
   • Some suggested that there might be an electrical issue, where the signal to engage the hydraulic pump or valves was not being sent properly. Wiring problems or a blown fuse could be the cause.
     

Potential Solutions:

1. Check Hydraulic Fluids and Filters:
   • Ensure that the hydraulic fluid is at the proper level and that the fluid is clean. Old or contaminated fluid can cause the system to fail.
     
   • Change the filters if necessary and ensure no air is trapped in the hydraulic lines.
     
2. Inspect the Relief Valve:
   • Examine the relief valve for any signs of wear or malfunction. If it's stuck, it may need to be replaced or repaired.
     
3. Test the Solenoid and Control Valves:
   • Check the solenoids and control valves for functionality. If the valve isn’t directing the fluid as needed, it may need to be serviced or replaced.
     
4. Check Electrical Components:
   • Inspect the electrical wiring and connections related to the hydraulic system to ensure they are intact and functioning. A faulty wire or connection could be the root of the problem.
     

Conclusion:
Addressing the lack of down pressure on the Bobcat T190 involves thoroughly checking the hydraulic system, including the pump, relief valve, solenoid, and wiring. By performing these checks, the problem can usually be diagnosed, and the necessary repairs can be made.