John Deere 70A Loader Bucket Lift Issue

[MikePhua]

John Deere loaders, including the 70A model, are known for their durability and versatility on construction sites, farms, and various heavy-duty tasks. However, like any piece of machinery, they can experience issues, particularly when it comes to critical functions like the loader bucket's ability to go up or down. In this article, we will discuss common reasons why the bucket lift might fail, along with troubleshooting steps, solutions, and general advice for maintaining your John Deere 70A loader to avoid this kind of problem.
Overview of the John Deere 70A Loader
The John Deere 70A is a mid-sized skid-steer loader designed to handle a variety of lifting and digging tasks. Known for its robust construction and reliable performance, it features powerful hydraulic systems and an efficient drivetrain to handle heavy materials. The 70A loader is part of John Deere’s A-series skid-steer lineup, which is widely used in industries like agriculture, construction, and landscaping. Its compact size allows for easy maneuverability in tight spaces, while the high lift capacity ensures that it can handle a wide range of tasks efficiently.
Common Causes for a Loader Bucket Not Moving
When the bucket on a John Deere 70A loader fails to move up or down, it can be frustrating and may halt work on the job site. This issue often stems from one of several potential causes. Below are some of the most common reasons:
1. Hydraulic System Failure
The bucket's lift function is powered by hydraulic fluid, which flows through the hydraulic lines to the lift cylinders. A loss of hydraulic pressure or fluid can prevent the bucket from moving. There are several components in the hydraulic system that could be at fault:

• Hydraulic fluid leak: A leak in any of the hydraulic lines, hoses, or fittings could cause a drop in fluid levels, resulting in reduced hydraulic pressure.
  
• Clogged hydraulic filter: If the hydraulic filter becomes clogged with dirt or debris, it can restrict the flow of fluid, causing the bucket to become unresponsive.
  
• Faulty hydraulic pump: The hydraulic pump is responsible for generating the necessary pressure to move the hydraulic cylinders. A malfunctioning pump can prevent the bucket from moving, especially if the pump is worn or damaged.
  

2. Electrical Issues
On modern loaders like the John Deere 70A, there may be an electrical issue preventing the bucket from lifting. The loader uses a combination of switches, relays, and sensors to control hydraulic functions. Problems with any of these electrical components can result in a failure of the lift function. The following electrical issues could be responsible:

• Faulty relay or fuse: A blown fuse or a malfunctioning relay in the control circuit can interrupt the operation of the hydraulic system.
  
• Broken switch or wiring: If the joystick or other control switches are damaged, or if wiring is frayed or disconnected, the signals to activate the hydraulic cylinders may not be sent.
  

3. Mechanical Obstructions
While hydraulic and electrical issues are often the primary cause of lift failure, mechanical obstructions can also cause the bucket to become stuck or unresponsive. This can happen when the lift arms or bucket components become clogged with dirt, mud, or other debris. Over time, wear and tear on moving parts such as bushings, pins, or hydraulic cylinders can also prevent smooth operation.

• Blockage: If debris gets stuck in the lift mechanism or the bucket’s pivot points, it can restrict movement. Routine cleaning and lubrication are essential to prevent these types of obstructions.
  
• Worn-out components: Over time, parts like the hydraulic cylinders or lift arms may wear out and fail to operate as intended. If these components are cracked or damaged, they may require replacement.
  

4. Low Hydraulic Fluid Levels
Low fluid levels in the hydraulic system can also prevent the bucket from functioning properly. Hydraulics rely on fluid to transmit force, and a shortage of fluid can lead to a loss of pressure, rendering the lift cylinders ineffective. A quick inspection of the hydraulic reservoir and fluid levels should be performed to ensure this is not the issue.
Troubleshooting the Bucket Lift Issue
If you are experiencing problems with your John Deere 70A loader bucket not going up or down, here are some steps you can take to troubleshoot and identify the source of the problem:
1. Check Hydraulic Fluid Levels
Start by checking the hydraulic fluid levels. If they are low, this could be the simplest explanation for the failure. Refill the hydraulic reservoir with the recommended fluid type and check for any visible leaks in the system. Leaks can occur in hydraulic hoses, connections, or the pump itself, and should be repaired immediately.
2. Inspect the Hydraulic System

• Inspect hydraulic hoses and fittings for any visible signs of damage or leaks.
  
• Replace the hydraulic filter if it appears dirty or clogged. This is often a quick fix to restore proper flow and pressure.
  
• Test the hydraulic pump to ensure it is functioning correctly. If the pump is not generating adequate pressure, it may need to be repaired or replaced.
  

3. Examine the Electrical System
Inspect the electrical components related to the hydraulic system, such as fuses, relays, and control switches. Make sure there are no loose connections or broken wiring. Test the relays and fuses to ensure they are in good working order. If the joystick or control switch is not sending signals properly, it may need to be replaced.
4. Clean and Lubricate Mechanical Parts
If the bucket or lift arms are stuck due to debris, perform a thorough cleaning of the lift mechanism. Lubricate the moving parts, including the pivot points, to ensure smooth operation. Inspect the mechanical components for wear and tear; if any parts appear damaged, they should be replaced.
Preventive Maintenance Tips
To avoid future issues with the bucket lift and to keep your John Deere 70A loader operating efficiently, follow these preventive maintenance practices:

• Regular fluid checks: Regularly check and top off hydraulic fluid levels to ensure optimal performance.
  
• Change hydraulic filters: Replace hydraulic filters at regular intervals to keep the system free of contaminants and ensure proper flow.
  
• Inspect hoses and fittings: Regularly inspect hydraulic hoses and fittings for signs of wear, leaks, or damage. Replace any damaged components promptly.
  
• Clean and lubricate: Clean and lubricate the lift arms, pivot points, and bucket to prevent mechanical obstructions and ensure smooth movement.
  
• Monitor electrical components: Inspect the electrical system and components periodically to ensure they are functioning properly and that there are no loose or damaged wires.
  

Conclusion
When the bucket on a John Deere 70A loader fails to go up or down, it can be a result of several common issues, ranging from hydraulic system failures to electrical malfunctions or mechanical obstructions. Troubleshooting involves checking hydraulic fluid levels, inspecting the hydraulic system for leaks or blockages, and ensuring that electrical components are functioning correctly. Regular maintenance and preventive care can go a long way in preventing these issues from arising in the first place, keeping your loader in good working condition and ready for the job at hand.