Case 1845C Hydraulics: Do I Need to Bleed the Level Gauge?

[MikePhua]

Hydraulic systems are the heart of many heavy equipment machines, such as the Case 1845C skid steer loader. These systems rely on the movement of hydraulic fluid to transmit power to various components, such as the lift arms and auxiliary attachments. However, when something goes wrong with the system, it can cause significant operational issues. One of the most common hydraulic concerns is whether or not to bleed the hydraulic level gauge, especially after hydraulic fluid changes or when air is suspected to be trapped in the system.
This article explores the importance of the hydraulic system in your Case 1845C, the common issues associated with it, and whether bleeding the hydraulic level gauge is necessary in certain scenarios.
Hydraulic Systems in Heavy Equipment
The hydraulic system in a skid steer loader like the Case 1845C plays a crucial role in its ability to perform various tasks, such as lifting, digging, or powering attachments. Hydraulic systems use fluid to generate force and control the movement of the loader's components.
The system is typically composed of a hydraulic pump, valves, cylinders, hoses, and fluid reservoirs. When fluid is pumped under high pressure through the system, it moves components such as pistons and cylinders, allowing the machine to lift, tilt, or dig with ease.
However, like any complex system, the hydraulic system can encounter problems. A common issue with hydraulic systems in machines like the Case 1845C is air or air bubbles becoming trapped in the hydraulic lines. This can result in erratic operation, reduced power, or even failure of certain functions.
Understanding the Role of the Hydraulic Level Gauge
The hydraulic level gauge is a component that helps you monitor the fluid level in the system. It's typically mounted on the side of the hydraulic tank, offering a clear view of the fluid's current level. If the fluid level drops too low, it can result in air entering the system, causing poor performance and possible damage.
Air in the system, often due to low fluid levels or the introduction of new fluid, can cause the system to act sluggish or unresponsive. It's important to regularly check and maintain the correct fluid level to ensure that air does not enter the hydraulic lines.
A level gauge, often part of the tank, will show if the fluid is at the appropriate level. In some cases, if the fluid level drops too low or air is trapped in the system, the gauge may give inaccurate readings. This is where the question arises: Do I need to bleed the level gauge?
When Should You Bleed the Hydraulic System?
In general, bleeding the hydraulic system refers to the process of removing air from the system. Air can enter the system for several reasons, including when the hydraulic fluid is changed, or if there’s a leak in the system. Air trapped in the lines can cause erratic behavior or the failure of hydraulic components to function properly. Bleeding the system ensures the hydraulic fluid flows freely, without interference from air pockets.
The Case 1845C has a self-priming hydraulic pump, meaning it is designed to be able to expel small amounts of air naturally. However, if you notice issues like the following, you may need to bleed the system:

• Erratic movements of the lift arms or other hydraulic-powered parts.
  
• Delayed response when operating the auxiliary hydraulics.
  
• Noisy hydraulics, such as a whistling or sputtering sound when the pump is engaged.
  
• Inconsistent hydraulic performance.
  

If the level gauge is providing incorrect readings, it could be due to air in the system, which can cause the sensor to malfunction or provide false readings. In this case, you might need to bleed the system to restore accurate readings and reliable performance.
How to Bleed the Hydraulic System on a Case 1845C
If you suspect air is trapped in the hydraulic lines, bleeding the system is a relatively simple process. Here’s a general guide to bleeding the hydraulic system:

1. Check the Fluid Level: Before you begin, ensure the hydraulic fluid is at the proper level. Use the level gauge to confirm the fluid is full. If the fluid level is low, top it up with the recommended type of hydraulic fluid for your Case 1845C.
   
2. Start the Machine: Start the engine and let it idle. Make sure the hydraulic system is pressurized and operating.
   
3. Engage the Hydraulic System: Activate the hydraulic functions, such as the lift arms or auxiliary hydraulics. This will allow the fluid to circulate through the system and push out any trapped air.
   
4. Move the Controls: Cycle the hydraulic controls several times. This ensures that the fluid is moving through the entire system, including the cylinders, valves, and hoses. By doing this, any trapped air will have a chance to escape.
   
5. Check for Air Bubbles: Observe the hydraulic fluid for any signs of air bubbles. If air is trapped, you may notice bubbling or foam in the fluid as it circulates.
   
6. Bleed the Level Gauge: If the level gauge is still showing inaccurate readings, it may need to be manually bled. To do this, you can locate the vent screw on the level gauge and loosen it slightly, allowing any air to escape. Be cautious not to open it too much to avoid spilling hydraulic fluid.
   
7. Recheck Fluid Level: After cycling the system and bleeding the level gauge, check the fluid level once more to ensure it is accurate. Add more fluid if necessary.
   
8. Test the System: After bleeding the system, test the hydraulic functions once again to ensure the performance is smooth and consistent.
   

Additional Considerations
When dealing with hydraulic issues in machines like the Case 1845C, always remember that proper maintenance is key to preventing problems in the first place. Here are some additional tips for keeping your hydraulic system in top shape:

• Regularly check fluid levels: Ensure your hydraulic fluid is always at the correct level, especially after any maintenance or fluid changes.
  
• Inspect for leaks: Hydraulic leaks are a common cause of air entering the system. Regularly inspect hoses, fittings, and seals for signs of wear or damage.
  
• Use the correct fluid: Always use the hydraulic fluid recommended by the manufacturer to ensure optimal performance and longevity of your equipment.
  
• Maintain the level gauge: Ensure that the level gauge is clean and free from debris. A dirty or obstructed gauge can provide inaccurate readings, which can lead to improper maintenance decisions.
  

Conclusion
The hydraulic system of a Case 1845C is crucial to its performance and reliability. If you’re experiencing issues such as erratic movements, noisy hydraulics, or inaccurate level gauge readings, it could be a sign that air is trapped in the system. While the self-priming hydraulic pump is designed to handle small amounts of air, manual bleeding of the system may be necessary in more severe cases. By following the steps outlined above, you can effectively bleed the hydraulic system, ensuring your machine operates smoothly and efficiently.
Regular maintenance and monitoring of the hydraulic system, including checking the fluid levels and inspecting for leaks, will help prevent air from entering the system and reduce the need for frequent repairs.