Troubleshooting Hydraulic Issues on the Case 1845C Loader: "Goes Up, Won’t Go Down"

[MikePhua]

The Case 1845C skid steer loader is a popular and reliable piece of equipment used in various industries such as construction, landscaping, and agriculture. However, like any heavy machinery, it can encounter mechanical issues that affect its performance. One common problem operators may face is a hydraulic issue where the loader’s lift arms or bucket will rise, but they won’t lower back down. This specific problem can lead to inefficiencies on the job site and, if left unaddressed, could worsen over time.
In this article, we explore the causes and troubleshooting steps for this hydraulic issue on the Case 1845C loader, focusing on why the loader goes up but won’t go down. We'll also provide some maintenance tips to help you avoid similar problems in the future.
Understanding the Hydraulic System of the Case 1845C Loader
The hydraulic system on a skid steer loader like the Case 1845C is essential for operating key functions such as raising and lowering the lift arms, controlling the bucket, and powering other attachments. The system works by using hydraulic fluid to transmit force to the necessary components.
Key components of the hydraulic system include:

1. Hydraulic Pump: Provides the necessary pressure to drive the hydraulic fluid to various parts of the system.
   
2. Hydraulic Cylinders: Responsible for the movement of the lift arms and attachments, powered by pressurized fluid.
   
3. Control Valve: Directs the flow of hydraulic fluid to the appropriate cylinders depending on the operator’s input.
   
4. Hydraulic Fluid Reservoir: Holds the fluid that circulates through the system.
   
5. Hoses and Fittings: Carry the hydraulic fluid to and from the cylinders and other parts.
   

When a loader like the Case 1845C experiences a hydraulic issue, it can prevent the loader from functioning properly. A "goes up, won’t go down" issue typically points to problems with the hydraulic flow or pressure.
Common Causes of "Goes Up, Won’t Go Down" Hydraulic Issues
Several factors can cause the Case 1845C to lift the arms but fail to lower them. These issues can range from hydraulic fluid problems to mechanical malfunctions. Below are the most common causes:

1. Low Hydraulic Fluid:
   One of the most common causes of hydraulic issues in skid steer loaders is low hydraulic fluid levels. If there isn’t enough fluid in the system, it can prevent the hydraulic cylinders from functioning correctly, particularly in the lowering motion.
   Solution: Check the hydraulic fluid level in the reservoir. If the fluid is low, top it up with the recommended type of hydraulic fluid. It’s also a good idea to check for any signs of fluid leaks around hoses or connections, as these can lead to a loss of pressure.
   
2. Air in the Hydraulic Lines:
   Air trapped in the hydraulic lines can cause inconsistent hydraulic movement, particularly when trying to lower the lift arms. This can happen if the system has been drained and refilled, or if there is a leak allowing air to enter.
   Solution: Bleed the hydraulic system to remove any trapped air. Some machines require a specific procedure to do this, so it’s important to refer to the service manual for the correct steps. Make sure all hydraulic connections are tight to prevent air from entering.
   
3. Faulty Hydraulic Control Valve:
   The hydraulic control valve directs fluid to the lift arms and other attachments based on the operator’s commands. If this valve is malfunctioning, it can prevent the fluid from flowing properly to the cylinder responsible for lowering the lift arms.
   Solution: Inspect the hydraulic control valve for any signs of damage or internal wear. A faulty valve may need to be cleaned, adjusted, or replaced depending on the severity of the issue.
   
4. Sticking or Damaged Lift Cylinder:
   If the lift cylinder or any associated seals are damaged, it could lead to uneven hydraulic flow. A stuck cylinder can prevent the arms from coming down, even though they can still lift up.
   Solution: Inspect the hydraulic cylinders for damage or signs of wear. If the seals are worn, replace them to restore full functionality. In some cases, the entire cylinder may need to be replaced if the issue is more severe.
   
5. Hydraulic Pump Issues:
   The hydraulic pump provides the pressure needed to operate the system. If the pump is malfunctioning, it can result in weak or inconsistent hydraulic pressure, which can impact the lowering function of the lift arms.
   Solution: Test the hydraulic pump to ensure it’s providing the correct pressure. If the pump is faulty, it may need to be repaired or replaced.
   
6. Check Valve Problems:
   The check valve is responsible for maintaining hydraulic pressure in the system. If the check valve fails, the system may lose pressure when attempting to lower the arms, causing them to remain stuck in the raised position.
   Solution: Inspect the check valve for proper function. If necessary, replace the check valve to restore normal hydraulic operation.
   

Troubleshooting Steps for the Case 1845C Hydraulic Issue
If your Case 1845C loader is experiencing a "goes up, won’t go down" hydraulic issue, follow these troubleshooting steps to isolate and resolve the problem:

1. Step 1: Check Hydraulic Fluid Level:
   Begin by checking the hydraulic fluid level in the reservoir. If it’s low, top it off with the correct type of fluid. Ensure there are no visible leaks in the hydraulic system.
   
2. Step 2: Bleed the Hydraulic System:
   If air is suspected in the hydraulic lines, follow the appropriate steps to bleed the system. This may involve operating the loader’s controls to allow air to escape from the hydraulic lines.
   
3. Step 3: Inspect the Control Valve:
   If the issue persists, inspect the hydraulic control valve for any signs of damage or blockage. A malfunctioning valve can prevent the system from directing fluid properly.
   
4. Step 4: Examine the Hydraulic Cylinders:
   Inspect the lift cylinders for any signs of damage, such as leaks or stuck pistons. If the seals are worn or the cylinder is damaged, repair or replace it as necessary.
   
5. Step 5: Test the Hydraulic Pump:
   If all else fails, test the hydraulic pump to ensure that it’s delivering the necessary pressure to the system. A weak or malfunctioning pump may need to be replaced.
   

Preventing Hydraulic Issues on the Case 1845C Loader
To avoid facing hydraulic issues in the future, consider implementing the following best practices:

1. Regular Fluid Checks: Make it a habit to check the hydraulic fluid level regularly to ensure that the system is properly lubricated and pressurized.
   
2. Prevent Leaks: Keep an eye out for any hydraulic fluid leaks, especially around hoses, seals, and cylinders. Early detection of leaks can prevent major fluid loss and system failure.
   
3. Use the Correct Fluid: Always use the manufacturer-recommended hydraulic fluid to ensure optimal performance. Using the wrong type of fluid can cause damage to components over time.
   
4. Maintain the Hydraulic System: Clean and maintain the hydraulic system regularly. This includes replacing worn seals and inspecting hoses and fittings for damage.
   
5. Consult the Manual: Always consult the owner’s manual or service guide for proper maintenance procedures, as each loader may have specific recommendations for hydraulic maintenance.
   

Real-World Example: Resolving a Similar Hydraulic Issue
A construction crew using a Case 1845C loader faced a similar hydraulic problem where the loader’s arms would lift but would not come down. After several unsuccessful attempts to resolve the issue, the crew discovered that the hydraulic fluid was low, and there was air trapped in the lines. After topping up the fluid and properly bleeding the system, the loader’s lift arms operated normally again. This quick fix minimized downtime and allowed the team to continue their work without further interruptions.
Conclusion: Ensuring Hydraulic System Health on the Case 1845C
The "goes up, won’t go down" hydraulic issue on the Case 1845C loader is a common but manageable problem. By regularly inspecting the hydraulic system, using the right fluid, and addressing minor issues early on, you can ensure that your loader remains in top working condition. Proper troubleshooting and maintenance practices will keep your machine running smoothly, reduce downtime, and ultimately save you time and money in the long run.