Troubleshooting and Repairing the Wheel Drive Issues on a 1970 Case 1740

[MikePhua]

The Case 1740 is a vintage skid steer loader that was known for its durability and versatility. However, like all heavy equipment, it can develop issues over time. One of the most perplexing problems that can arise with older models like the 1970 Case 1740 is when the wheels on one side of the machine stop moving. This issue can be particularly frustrating as it compromises the skid steer’s ability to maneuver and perform its typical operations efficiently.
In this article, we’ll explore the potential causes of this issue and guide you through the steps needed to diagnose and repair it. We’ll also discuss some general maintenance tips to help keep your Case 1740 running smoothly for years to come.
Common Causes for Wheels Not Moving on One Side
When one side of your Case 1740 skid steer stops moving, the issue usually lies within the drivetrain or hydraulic system, as these are responsible for providing power to the wheels. Let’s break down some of the most common causes:

1. Hydraulic System Issues
   The Case 1740 is powered by hydraulics, and issues with the hydraulic system can lead to one side of the skid steer not functioning. If the hydraulic pump, lines, or motor are malfunctioning, the wheels on that side may stop moving.
   • Low or Contaminated Hydraulic Fluid: One of the first things to check is the hydraulic fluid level. If it’s low, it may cause poor hydraulic performance. Contaminated fluid can also hinder performance, clogging lines or valves.
     
   • Hydraulic Pump Problems: The hydraulic pump is responsible for circulating the hydraulic fluid. If the pump is failing or has a leak, it can reduce the hydraulic pressure needed to power one side of the wheels.
     
   • Hydraulic Motor Failure: The wheels on each side of the skid steer are powered by hydraulic motors. If one of these motors is damaged or worn out, it could stop driving the wheels on that side.
     
2. Drive Chain or Sprocket Issues
   Another potential cause of one side of the wheels not moving could be an issue with the drive chain or sprockets. If the chain is broken, worn, or has come off the sprockets, the affected side will not move. Inspecting the chain and sprockets for wear and tear is an essential step in diagnosing this problem.
   
3. Faulty Differential or Transmission
   The differential or transmission system may be at fault if there is an issue with one side of the drivetrain. In some cases, the gear mechanism may become worn or damaged, causing the wheels on one side to stop moving. This could be due to broken teeth on the gears or lack of lubrication.
   
4. Electrical or Control System Malfunction
   Older machines like the 1970 Case 1740 may also experience electrical or control issues that affect the wheel drive. A malfunctioning switch, relay, or control valve could prevent the hydraulic motors from receiving the correct signals to function properly.
   
5. Brake Issues
   Sometimes, if the brake on one side of the skid steer is sticking or not releasing properly, it may seem like the wheels on that side aren’t moving. Check the brakes for any signs of sticking or excessive wear.
   

Diagnosing the Problem
Now that we’ve covered some potential causes, let’s discuss how to diagnose the problem step-by-step. Here’s a simple guide to help you troubleshoot the issue with one of the wheels on your Case 1740.

1. Check Hydraulic Fluid Levels and Quality
   Start by inspecting the hydraulic fluid levels in the machine. If the fluid is low, top it up with the recommended type of hydraulic fluid. If the fluid appears dirty or contaminated, it’s a good idea to replace it and change the filter as well. Contaminated fluid can cause a variety of performance issues.
   
2. Inspect Hydraulic Lines and Pump
   Next, check the hydraulic lines for any visible leaks or signs of wear. If there are any leaks, they will need to be repaired or replaced. You should also inspect the hydraulic pump to ensure it’s working properly. If the pump is malfunctioning, it may need to be rebuilt or replaced.
   
3. Test the Hydraulic Motors
   Each side of the skid steer is powered by a hydraulic motor. If one motor has failed, the wheel on that side won’t move. To check the motors, you may need to disconnect the hydraulic lines to the affected motor and test the pressure. If the motor doesn’t respond or produces inconsistent pressure, it may need to be replaced.
   
4. Check the Drive Chain and Sprockets
   Next, inspect the drive chain and sprockets. Look for any broken, worn, or loose components. A damaged drive chain or sprockets can easily cause one side of the wheels to stop moving. If you find any issues, you’ll need to replace or adjust the chain and sprockets.
   
5. Examine the Differential and Transmission
   If there are no issues with the hydraulic system or drive components, the problem may be within the differential or transmission. Check for any signs of damage or excessive wear on the gears. You may need to disassemble the differential to inspect it more thoroughly.
   
6. Inspect the Brakes
   Finally, check the brakes on the affected side. If they are sticking or binding, it could prevent the wheel from moving properly. Release any sticking brakes and check for any damaged or worn brake components.
   

Repairing the Issue
Once you’ve identified the root cause of the problem, it’s time to make the necessary repairs.

• Replace or Repair Hydraulic Components: If the issue lies with the hydraulic motor or pump, it may be necessary to replace the faulty components. Hydraulic motors are specialized parts, so make sure to get a direct replacement from the manufacturer or a trusted aftermarket supplier.
  
• Replace the Drive Chain or Sprockets: If the chain or sprockets are damaged, replace them with high-quality, compatible parts. Ensuring proper tension and alignment is crucial when reassembling the drive system.
  
• Fix or Replace the Differential/Transmission: If the issue is within the differential or transmission, disassemble the affected area and inspect the gears for any visible damage. Worn-out gears may need to be replaced, and it’s essential to check the lubrication levels before reassembly.
  
• Brake Repairs: If the issue is due to sticking brakes, disassemble the brake assembly and check for debris, dirt, or corrosion. Replace any worn brake components, and ensure that the brakes are properly adjusted.
  

Preventative Maintenance Tips
Preventative maintenance is key to extending the lifespan of your Case 1740 and avoiding future issues with the wheel drive system. Here are some tips to keep in mind:

• Regularly Check Hydraulic Fluid: Keep an eye on the hydraulic fluid levels and quality. Change the fluid at regular intervals as specified in the owner’s manual.
  
• Inspect the Drive Chain and Sprockets: Regularly check the drive chain and sprockets for wear and adjust the tension as needed. Replacing these parts before they become too worn can save you from larger, more expensive repairs down the road.
  
• Monitor Brake Function: Ensure that the brakes are working properly and adjust them as needed to prevent sticking.
  
• Keep the Machine Clean: Regular cleaning of the skid steer can help prevent dirt and debris from clogging the hydraulic lines or interfering with the drivetrain components.
  

Conclusion
When the wheels on one side of your 1970 Case 1740 skid steer aren’t moving, it’s essential to diagnose the issue quickly to prevent further damage. Whether the problem is hydraulic, mechanical, or electrical, understanding the potential causes and following a step-by-step troubleshooting guide can help you pinpoint the issue and make the necessary repairs.
By maintaining your Case 1740 with regular checks and servicing, you can avoid many of the common problems that arise with aging equipment. Proper care and attention will ensure that your machine continues to perform efficiently, even after decades of service.