Troubleshooting Jerking and Bucking Issues on the Bobcat T190 Skid Steer

[MikePhua]

Skid steers like the Bobcat T190 are designed to provide versatility, maneuverability, and power in a variety of applications. However, like any piece of heavy machinery, these machines can encounter issues that disrupt their smooth operation. One common issue that operators often face with the Bobcat T190 is jerking and bucking, where the machine's movements become erratic, jerky, or inconsistent during operation. This problem not only reduces the machine's performance but can also pose safety risks to operators. In this article, we’ll explore the potential causes of jerking and bucking in the Bobcat T190, how to troubleshoot these issues, and share insights from operators who have dealt with similar problems.
Understanding Jerking and Bucking in Skid Steers
When a skid steer like the Bobcat T190 begins to jerk or buck, it means that the machine is not responding smoothly to input from the operator. These abrupt movements are typically caused by issues with the drive system, hydraulics, or controls, and can often occur under heavy load conditions or when the machine is performing tasks that require fine control, such as lifting or pushing.
Jerking refers to sudden, sharp movements where the machine lurches forward or backward, while bucking usually involves a series of jerky, repeated motions that make it difficult to control the loader smoothly. Addressing these issues quickly is crucial for both safety and efficiency on the job site.
1. Hydraulic System Problems
The most common cause of jerking and bucking in the Bobcat T190 is hydraulic issues. Since skid steers rely heavily on hydraulics to control movement and lift, any disruption in the hydraulic flow can cause erratic behavior. Some possible hydraulic issues include:

• Low hydraulic fluid levels: If the fluid level is too low, the hydraulic system won’t be able to generate the proper pressure to control the machine smoothly.
  
• Hydraulic filter clogs: A clogged filter can restrict the flow of hydraulic fluid, leading to irregular movement.
  
• Air in the hydraulic lines: Air pockets can cause inconsistent pressure, leading to jerking when the machine moves.
  

Solution:

• Check fluid levels regularly and top them up if necessary. Be sure to use the proper hydraulic fluid recommended by the manufacturer.
  
• Inspect hydraulic filters and clean or replace them if they are dirty or clogged.
  
• Bleed the hydraulic system to remove any air. This can often solve issues related to inconsistent pressure and jerky movements.
  

Real-life stories from construction companies highlight that low hydraulic fluid levels are often an overlooked issue. For example, a construction team in Florida faced jerking and stuttering while operating their Bobcat T190 during a grading job. After checking the fluid levels, they found it was nearly empty. Once topped off, the machine ran smoothly again.
2. Drive Motor or Transmission Issues
Another potential cause of jerking and bucking is issues with the drive motors or transmission. In skid steers, the drive motors control the movement of the wheels or tracks, and any malfunction in this system can cause abrupt starts and stops, resulting in jerking or bucking movements.
Some possible causes include:

• Worn drive motor: Over time, the drive motor can wear out, reducing its efficiency and causing jerky movements.
  
• Contaminated transmission fluid: If the transmission fluid is dirty or degraded, it can cause the transmission to behave erratically, leading to jerking.
  
• Low or high fluid levels: Both can lead to problems with the transmission system. Too little fluid reduces lubrication, while too much fluid can cause excess pressure.
  

Solution:

• Inspect the drive motors for wear and tear. If they show signs of damage, they may need to be rebuilt or replaced.
  
• Check transmission fluid levels and ensure that the fluid is clean. If it appears dirty, replace it with fresh fluid.
  
• Lubricate moving parts regularly to prevent unnecessary friction and wear.
  

One operator shared an experience where the cause of bucking was traced back to a worn drive motor. After replacing the motor, the machine performed better than ever, with smooth and controlled movements.
3. Control Issues or Calibration Problems
Sometimes, the issue isn't mechanical but electrical. Skid steers like the Bobcat T190 rely on electronic controls for movement, and any issue with the control system can lead to jerky or unresponsive behavior.
Solution:

• Check the control system for any errors or faults. A malfunctioning joystick or control lever could be sending incorrect signals to the machine.
  
• Recalibrate the controls if necessary. Sometimes, recalibrating the joysticks or other control mechanisms can resolve these issues.
  
• Inspect the wiring to ensure there are no loose or corroded connections. Electrical issues often stem from poor connections or frayed wires.
  

An operator from a landscaping company in Oregon faced a jerking issue with their Bobcat T190, which was traced back to a faulty joystick. Once replaced, the machine's movements returned to normal. This highlights the importance of ensuring that all electronic components are functioning properly.
4. Suspension and Tire Issues
For machines with wheels, tire pressure or suspension issues can contribute to jerking or bucking, especially on uneven terrain. Incorrect tire pressure can lead to uneven wear or a lack of traction, causing the machine to behave unpredictably.
Solution:

• Check tire pressure regularly. The correct pressure ensures even wear and smooth operation. Over-inflated tires may cause the machine to bounce, while under-inflated tires can make it sluggish and less responsive.
  
• Inspect the suspension system for any worn-out components. If the suspension is compromised, it may not absorb impacts properly, leading to jerking movements.
  

In one memorable instance, a construction company in Nevada found that their Bobcat T190 was bucking during movement across rough terrain. After adjusting the tire pressure to the recommended levels, the machine’s movements became much more controlled and consistent.
5. Dirty or Worn-out Hydraulic Couplings
Sometimes, the jerking and bucking can be caused by dirty or worn-out hydraulic couplings. These couplings are responsible for transmitting power through the hydraulic system, and if they become worn or clogged with debris, they can disrupt the flow of fluid.
Solution:

• Clean the couplings and inspect them for wear. If they appear damaged, they should be replaced to restore normal hydraulic function.
  

Preventing Jerking and Bucking in the Future
To prevent jerking and bucking from becoming recurring problems, regular maintenance is key. Here are a few tips for keeping your Bobcat T190 in top condition:

• Perform routine fluid checks and replace filters as needed.
  
• Keep the hydraulic system clean by flushing it periodically and checking for air in the lines.
  
• Ensure proper tire pressure and suspension maintenance.
  
• Regularly inspect the drive motors and transmission for wear or damage.
  

Additionally, some operators find it helpful to perform a full system calibration at regular intervals to ensure that all components are working in harmony. This small investment in time can save considerable headaches down the line.
Conclusion
Jerking and bucking issues on the Bobcat T190 are common but manageable with the right troubleshooting and maintenance. By addressing hydraulic, drive motor, control, suspension, and tire-related issues, you can keep your skid steer running smoothly and avoid disruptions in your work. Whether you're using it for construction, landscaping, or agricultural tasks, maintaining your equipment in top condition ensures optimal performance and safety on the job site.