Replacing the Twin Pump on a Case 1840 Skid Steer

[MikePhua]

The Case 1840 skid steer loader, a reliable machine known for its versatility in construction and landscaping, occasionally faces mechanical issues that require attention. One of the more challenging problems that operators might encounter is the need to replace the twin hydraulic pump. This issue, while not uncommon in older models, can significantly affect the machine’s performance, causing a decrease in hydraulic efficiency, erratic movements, and even complete system failure. Understanding the reasons behind the failure of the twin pump, the process for replacement, and preventative measures can help extend the life of the machine and avoid costly repairs.
Understanding the Hydraulic System in the Case 1840
The Case 1840, manufactured by Case Construction Equipment, is equipped with a hydraulic system designed to power the loader’s movement and attachment operations. The twin pump system in the 1840 is integral to these hydraulic functions, providing power to both the drive and auxiliary circuits. When the hydraulic pump begins to fail, it affects the overall functionality of the machine, leading to poor performance or even the complete inability to operate the loader efficiently.
The hydraulic system in the Case 1840 consists of two pumps that work in tandem to supply fluid pressure. These pumps are crucial for both lifting the loader arms and powering various attachments like buckets, forks, or augers. A malfunction in one or both of the pumps can cause a drop in pressure, leading to slower movements, reduced lifting capacity, or erratic operation of the attachments.
Symptoms of a Failing Twin Pump
Recognizing the signs of a failing twin pump early on is essential for minimizing downtime and preventing further damage to the hydraulic system. Some of the most common symptoms include:

• Slow Arm Movement: If the loader arms are slow to lift or lower, this can indicate that the pump is no longer delivering the required pressure.
  
• Erratic Attachment Operation: Attachments might not function properly, either operating too slowly or not responding at all.
  
• Noisy Operation: A failing pump often produces unusual sounds, such as whining or grinding noises, due to internal wear or loss of pressure.
  
• Fluid Leaks: Leaks around the pump housing or connections may indicate a failing pump seal or internal damage.
  
• Loss of Steering Control: If the hydraulic fluid pressure is low, the machine’s steering could become unresponsive, leading to difficult maneuverability.
  

Replacing the Twin Pump on the Case 1840
Replacing the twin pump on the Case 1840 is a job that requires technical expertise and a careful approach. It involves several steps, which include removing the old pump, installing the new one, and ensuring that the hydraulic system is properly primed and tested. Here is a general overview of the process:

1. Preparation: Before starting, ensure the machine is on stable ground, and all safety protocols are followed. Disconnect the battery and relieve hydraulic pressure to avoid accidents during the replacement.
   
2. Removing the Old Pump:
   • Locate the twin pump unit, which is typically found near the hydraulic reservoir.
     
   • Remove any covers or components blocking access to the pump.
     
   • Disconnect the hydraulic lines carefully, ensuring that no fluid spills. It is recommended to have a drain pan nearby to catch any residual fluid.
     
   • Unscrew and remove the pump mounting bolts, and carefully extract the old pump from its housing.
     
3. Installing the New Pump:
   • Position the new twin pump in the same orientation as the old one.
     
   • Reinstall the mounting bolts securely to hold the pump in place.
     
   • Reconnect the hydraulic lines, ensuring that each connection is tight to prevent leaks.
     
   • Reinstall any covers or components that were removed to access the pump.
     
4. Priming and Testing:
   • Once the new pump is installed, it is important to prime the hydraulic system to eliminate any air pockets that could affect the performance.
     
   • Fill the hydraulic reservoir with the appropriate type and amount of hydraulic fluid as specified by the manufacturer.
     
   • Start the engine and let it idle while observing the system for leaks or irregularities in pressure.
     
   • Test the loader arms and attachments to ensure they respond smoothly and at the proper speed.
     
5. Final Checks: After installation and testing, check for any unusual sounds or leaks, and verify that the hydraulic fluid level remains stable. If all tests pass, the machine is ready for operation.
   

Choosing the Right Replacement Pump
When replacing the twin pump in the Case 1840, it is essential to choose a pump that matches the specifications of the original equipment. Using aftermarket parts may be tempting due to their lower cost, but it is always safer to go with genuine Case parts or those that meet OEM (Original Equipment Manufacturer) standards. This ensures compatibility and reliability, ultimately extending the lifespan of your machine and avoiding premature wear.
Maintenance Tips to Prevent Future Pump Failures
Preventing premature pump failure in the Case 1840 starts with regular maintenance. Here are some useful tips to keep your hydraulic system running smoothly:

1. Monitor Hydraulic Fluid Levels: Ensure that the hydraulic fluid is always at the correct level. Low fluid can lead to pump damage due to inadequate lubrication and cooling.
   
2. Change Hydraulic Fluid Regularly: Over time, hydraulic fluid can break down and become contaminated, affecting the performance of the pumps. Regular fluid changes can help keep the system clean and efficient.
   
3. Inspect Hydraulic Lines and Fittings: Check the hydraulic lines regularly for leaks or wear. Damaged hoses or fittings can lead to fluid loss, affecting the pressure and performance of the pumps.
   
4. Avoid Overloading the Machine: Operating the Case 1840 beyond its capacity can put excessive strain on the hydraulic system, leading to premature pump failure.
   
5. Use the Right Attachments: Ensure that the attachments you are using are compatible with the machine’s hydraulic system. Using attachments that require more pressure than the system can provide can damage the pumps over time.
   

Conclusion
The Case 1840 is a reliable and powerful skid steer loader, but like any heavy machinery, its hydraulic system requires regular maintenance to function at its best. Replacing the twin hydraulic pump is a complex but manageable task for skilled operators, and understanding the process can save both time and money. Regular inspections, proper fluid maintenance, and careful operation can go a long way in preventing issues with the twin pump, ensuring the longevity of the equipment. By staying proactive and following proper maintenance protocols, operators can keep their Case 1840 skid steers running smoothly for years.