Why the Bobcat S70 Bucket Won't Raise Fully When Warmed Up

When the Bobcat S70’s bucket fails to raise fully after the machine has warmed up, it can cause delays and frustration during operations. This issue is often linked to problems within the hydraulic system, which powers the lift arms and bucket. In this article, we will explore the common causes of this problem, including issues with hydraulic fluid, pump performance, and other system components, and provide solutions to help you get your machine back to full functionality.

 

Hydraulic Fluid Issues

One of the most common causes of the Bobcat S70 bucket not raising fully when warmed up is related to the hydraulic fluid. Hydraulic systems rely on fluid to generate pressure and power the lift mechanism. If the hydraulic fluid is low, contaminated, or of the wrong type, it can cause performance issues, especially when the system heats up.

 

When the hydraulic fluid gets warm, it can thin out, reducing its ability to maintain proper pressure. This thinning of the fluid can lead to a loss of lifting power, preventing the bucket from raising fully. Additionally, using incorrect fluid or old, degraded fluid can cause the system to become less responsive over time.

 

Solution: Regularly check the hydraulic fluid levels and replace it if it’s low, dirty, or degraded. Always use the recommended type of fluid for your Bobcat S70, ensuring it is suitable for the temperature range in which you are operating. If the fluid has become too thin or old, it may be time to flush the system and refill with fresh, compatible fluid.

 

Hydraulic Pump Wear

The hydraulic pump plays a critical role in powering the lifting functions of the Bobcat S70. Over time, pumps can wear out due to constant use or insufficient maintenance. A worn-out pump may fail to generate enough pressure to fully lift the bucket, especially when the system is under load or has warmed up.

 

When the pump begins to fail, it may struggle to maintain the pressure needed for lifting, and this issue becomes more noticeable when the machine is in operation for longer periods and the system has heated up. If the hydraulic fluid is fine, but the pump isn’t working efficiently, it can cause the same issue of insufficient lifting power.

 

Solution: If you suspect the pump is the issue, check for signs of wear, such as unusual noises or fluid leaks around the pump. A detailed inspection or diagnostic test can help identify whether the pump needs to be replaced or repaired. Regular pump maintenance and early detection of wear can help prevent this problem in the future.

 

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Overheating of the Hydraulic System

Another common issue that can cause the Bobcat S70 bucket to fail to raise fully when the machine is warm is overheating of the hydraulic system. Hydraulic systems generate heat as part of their normal operation, but if the system gets too hot, it can cause the fluid to degrade and reduce the system’s overall efficiency.

 

Overheating can also be caused by a failure in the cooling system, such as a blocked oil cooler or a malfunctioning fan. When the hydraulic fluid gets too hot, it loses its ability to maintain the necessary pressure for the bucket to lift fully, resulting in reduced performance.

 

Solution: To address overheating, inspect the cooling system for blockages or debris. Ensure that the oil cooler and radiator are clean and free of dirt or other obstructions that could restrict airflow. If necessary, clean or replace the filters, and consider adding a secondary cooling fan to help maintain a lower operating temperature, especially during heavy-duty work.

 

Problems with Lift Cylinders and Valves

In some cases, the issue may lie with the lift cylinders or control valves that are responsible for raising the bucket. Worn-out seals, internal cylinder damage, or a malfunctioning valve can restrict fluid flow and prevent the bucket from lifting to its full height. These components may perform fine when the system is cold, but once the machine heats up and the fluid thins out, any internal wear or damage becomes more apparent.

 

Solution: Regularly inspect the lift cylinders for leaks or damage. If you notice any fluid leaking around the cylinders or if the lift is sluggish, it could indicate worn seals or internal damage. Similarly, check the control valves to ensure they are functioning correctly and not blocked by dirt or debris. If necessary, clean or replace any faulty components to restore full lifting power.

 

If your Bobcat S70 bucket is not raising fully when the machine warms up, the issue is often related to hydraulic fluid, pump performance, overheating, or problems with the cylinders and valves. By addressing these potential causes through regular maintenance, fluid checks, and system inspections, you can ensure that your Bobcat S70 operates smoothly and efficiently, even in demanding conditions. Keeping the hydraulic system in top shape will help you avoid this issue and maintain optimal performance for years to come.