Troubleshooting Hydraulic Shuttering and Shaking in the John Deere 3420 Telehandler

[MikePhua]

The John Deere 3420 telehandler is a versatile and reliable piece of equipment widely used in construction and agricultural industries. It is designed to handle a variety of tasks, such as lifting heavy loads and reaching high places. However, like all machinery, telehandlers can experience issues over time that affect their performance. One such issue is hydraulic shuttering or shaking, which can occur during operation. This article will explore the possible causes of hydraulic shuttering and shaking in the John Deere 3420 telehandler, provide solutions for troubleshooting, and offer advice on maintaining the machine for optimal performance.
Understanding Hydraulic Shuttering and Shaking
Hydraulic shuttering or shaking refers to a sudden, irregular movement or noise within the hydraulic system. It often manifests as a jerking motion or a vibrating sensation when operating the telehandler. This issue typically occurs when the hydraulic system is not functioning smoothly or when there are irregularities in the flow of hydraulic fluid. While these symptoms may not always indicate a severe problem, it is crucial to address them promptly to prevent further damage to the telehandler.
Common Causes of Hydraulic Shuttering and Shaking
Several factors can contribute to hydraulic shuttering or shaking in a telehandler. Below are the most common causes:
1. Low Hydraulic Fluid Levels

• One of the most common causes of hydraulic system issues is low fluid levels. When the hydraulic fluid drops below the recommended level, it can lead to irregular flow, causing the system to shutter or shake. Low fluid levels may result from leaks in the hydraulic system or improper fluid maintenance.
  

2. Air in the Hydraulic System

• Air trapped in the hydraulic system can cause erratic operation, leading to shaking or shuttering. Air may enter the system due to loose fittings, damaged seals, or improper fluid filling. When air mixes with the hydraulic fluid, it can cause cavitation (formation of bubbles) inside the pump, resulting in noise and vibration.
  

3. Worn Hydraulic Components

• Over time, hydraulic components such as the pump, valves, and hoses can wear out due to constant pressure and movement. Worn-out seals, O-rings, and other components can lead to leaks and inconsistent hydraulic fluid flow, which may cause shuttering or shaking during operation.
  

4. Clogged or Dirty Hydraulic Filters

• Hydraulic filters are designed to keep contaminants out of the system. If the filters become clogged or dirty, they can restrict the flow of hydraulic fluid, leading to pressure drops and erratic performance. Clogged filters may cause a variety of symptoms, including hydraulic shuttering or shaking.
  

5. Faulty Hydraulic Pump

• The hydraulic pump is responsible for generating the pressure needed to power the telehandler's hydraulic system. If the pump is faulty or malfunctioning, it may fail to provide the necessary pressure, causing the system to operate unevenly and result in shaking or shuttering. In some cases, a worn or damaged pump may also produce abnormal noise.
  

6. Incorrect Hydraulic Fluid

• Using the wrong type of hydraulic fluid can also contribute to hydraulic system issues. If the fluid is too thick or too thin, it can cause improper flow and increased wear on hydraulic components. Always ensure that you are using the correct type of fluid as specified in the telehandler’s manual.
  

7. Incorrect Pressure Setting

• The hydraulic system relies on specific pressure settings to function correctly. If the pressure is too high or too low, it can result in erratic operation and hydraulic shuttering. Pressure-related issues may be caused by faulty pressure relief valves or adjustments made to the hydraulic system.
  

Troubleshooting Hydraulic Shuttering and Shaking
If your John Deere 3420 telehandler is experiencing hydraulic shuttering or shaking, follow these steps to diagnose and resolve the issue:
1. Check Hydraulic Fluid Levels

• Begin by checking the hydraulic fluid levels. If the fluid is low, top it up with the recommended fluid. Be sure to inspect the entire hydraulic system for any signs of leaks, which could be causing the fluid loss.
  

2. Inspect for Air in the System

• If the fluid levels are correct, the next step is to check for air in the hydraulic system. Look for any loose or damaged fittings, seals, or hoses that may allow air to enter the system. Bleed the hydraulic lines if necessary to remove any trapped air.
  

3. Examine Hydraulic Filters

• Check the hydraulic filters for any signs of clogging or contamination. If the filters are dirty, clean or replace them as needed. Dirty filters can restrict fluid flow and contribute to the shaking or shuttering.
  

4. Inspect Hydraulic Pump and Valves

• Inspect the hydraulic pump and valves for any signs of wear, damage, or malfunction. If the pump is not generating adequate pressure, it may need to be repaired or replaced. A worn pump can lead to inconsistent hydraulic performance, resulting in shaking or shuttering.
  

5. Check the Fluid Type

• Ensure that the hydraulic fluid being used is the correct type and viscosity. If you are unsure, refer to the telehandler's manual for the specifications. Using the wrong type of fluid can cause problems with fluid flow and system efficiency.
  

6. Verify Hydraulic Pressure Settings

• Check the hydraulic pressure settings to ensure they are within the recommended range. Adjust the pressure as needed, or replace any faulty pressure relief valves that may be causing irregular pressure levels.
  

Preventative Maintenance for Hydraulic System Health
To prevent hydraulic shuttering or shaking from occurring in the future, regular maintenance of the hydraulic system is crucial. Below are some preventive measures:
1. Regular Fluid Checks and Changes

• Periodically check the hydraulic fluid levels and top them up as necessary. Regularly change the hydraulic fluid according to the manufacturer's recommendations to maintain optimal performance.
  

2. Inspect and Replace Filters

• Clean or replace the hydraulic filters regularly to ensure that contaminants do not interfere with fluid flow. A clean filter helps prevent blockages that could cause issues with the system.
  

3. Check for Leaks

• Regularly inspect the hydraulic system for leaks, as even small leaks can result in a significant loss of hydraulic fluid over time. Tighten any loose fittings or replace damaged hoses, seals, or O-rings as needed.
  

4. Inspect Hydraulic Components

• Inspect the hydraulic pump, valves, and hoses for signs of wear or damage. Replace any components that show signs of failure to prevent more serious issues from developing.
  

5. Ensure Proper Fluid Type and Pressure

• Always use the correct type and viscosity of hydraulic fluid as specified in the John Deere 3420 telehandler’s manual. Additionally, monitor the hydraulic system’s pressure settings to ensure they remain within the recommended range.
  

Conclusion: Keeping Your John Deere 3420 Telehandler in Top Shape
Hydraulic shuttering and shaking in the John Deere 3420 telehandler can be a frustrating issue, but with proper troubleshooting and maintenance, it can be resolved effectively. By regularly checking fluid levels, inspecting the hydraulic components, and performing routine maintenance, you can ensure the continued smooth operation of your telehandler.
As with all heavy machinery, addressing issues early and conducting preventive maintenance can save you from costly repairs down the line. With these steps in place, your John Deere 3420 telehandler will continue to be a reliable asset on the job site.