Resolving Slow and Jerky Uplift and Uptilt on 2017 S70 Skid Steer

[MikePhua]

On the panswork forum, some users have reported slow and jerky uplift and uptilt movements on their 2017 Bobcat S70 skid steer loader. This issue is often related to the hydraulic system’s efficiency and condition. Below is a summary of possible causes and solutions to help operators quickly troubleshoot and resolve the problem.
Problem Description
Users have noted that the 2017 Bobcat S70 skid steer loader exhibits very slow and uneven uplift and uptilt movements. These movements not only lack speed but also show noticeable jerking, which affects overall work efficiency.
Possible Causes

1. Low Hydraulic Oil Temperature or Poor Oil Quality
   Hydraulic oil that is too cold or degraded can result in poor system performance. Cold oil thickens and reduces flow, causing the hydraulic pump to function unevenly, which impacts the speed and smoothness of the loader's movements.
   
2. Hydraulic Pump or Valve Malfunction
   If the hydraulic pump or valve is malfunctioning, it could lead to insufficient oil pressure, causing the uplift and uptilt movements to become slow. A stuck valve or internal leakage could result in jerky and uneven operations.
   
3. Clogged or Leaking Hydraulic Lines
   Blockages or leaks in the hydraulic system's lines can reduce the oil flow, affecting the loader’s movements. Long-term usage or improper handling can cause the lines to break or become clogged, leading to hydraulic issues.
   
4. Control System Faults
   Faults in the loader’s control system could prevent the correct signals from reaching the hydraulic components. This could be an issue with the electronic control system or poor electrical connections, causing delays and jerky motions during operation.
   
5. Clogged Hydraulic Oil Filter
   A clogged hydraulic oil filter could also restrict oil flow, resulting in low hydraulic pressure, which impacts the loader’s uplift and uptilt actions. Regular filter changes are essential for maintaining a smooth hydraulic system.
   

Solutions

1. Check Hydraulic Oil and Temperature
   Begin by inspecting the hydraulic oil quality and temperature. If the oil is poor or the temperature is too low, replace the oil, and make sure to operate the loader in an environment with appropriate temperatures to avoid the impact of cold oil.
   
2. Inspect Hydraulic Pump and Valve
   If the oil and temperature are fine, but the issue persists, check the hydraulic pump and valve. Perform flow tests on the pump and inspect for internal leaks or faults. If needed, repair or replace the faulty parts.
   
3. Check Hydraulic Lines
   Inspect the hydraulic lines for any damage, blockages, or leaks. Repair or replace any faulty lines, and ensure that all connections are tightly secured.
   
4. Inspect the Control System
   Check the electrical system and control signals to ensure there are no faults or loose connections. If there’s an issue with the control system, you may need to conduct an electronic diagnosis and repair or replace the faulty components.
   
5. Replace Hydraulic Oil Filter
   Check and replace the hydraulic oil filter to ensure that oil flows freely. A clogged filter can significantly affect the system's performance, leading to slow and jerky movements.
   

Conclusion
The slow and jerky uplift and uptilt issue on the 2017 Bobcat S70 skid steer loader could be caused by several factors, including hydraulic oil quality, hydraulic system faults, line issues, control system problems, and a clogged oil filter. By systematically checking each part of the hydraulic system and performing necessary maintenance, operators can effectively resolve this issue and restore smooth performance, improving work efficiency.