Neutral Creep in John Deere 6675 Skid Steer: Causes and Solutions

[MikePhua]

Introduction
The John Deere 6675 skid steer loader, a compact and versatile machine, is widely used in construction, agriculture, and landscaping. However, some operators have reported issues with the machine creeping forward or backward even when the control levers are in the neutral position. This phenomenon, known as "neutral creep," can be concerning as it may lead to unintended movement and potential safety hazards.
Understanding Neutral Creep
Neutral creep occurs when the skid steer moves without any input from the operator, despite the control levers being in the neutral position. This issue is typically associated with the hydrostatic transmission system, which uses hydraulic fluid to transmit power from the engine to the wheels. In the case of the 6675 model, the hydrostatic system employs a chain drive and manual lever controls.
Common Causes of Neutral Creep

1. Worn or Damaged Linkages: Over time, the linkages connecting the control levers to the hydrostatic pump can wear out or become damaged. This wear can result in improper alignment, causing the machine to creep even when the levers are in neutral.
   
2. Hydraulic System Issues: Problems within the hydraulic system, such as low fluid levels, contaminated fluid, or malfunctioning valves, can lead to inconsistent pressure and flow, contributing to neutral creep.
   
3. Improper Neutral Adjustment: The neutral position of the control levers must be correctly adjusted to ensure that the hydrostatic pump is not inadvertently engaged. Incorrect adjustments can cause the machine to move unintentionally.
   

Diagnostic Steps
To address neutral creep in the John Deere 6675, consider the following diagnostic steps:

1. Inspect Linkages: Examine the linkages between the control levers and the hydrostatic pump for signs of wear or damage. Replace any worn or damaged components as necessary.
   
2. Check Hydraulic Fluid: Ensure that the hydraulic fluid is at the proper level and is free from contaminants. Replace the fluid if it appears dirty or degraded.
   
3. Adjust Neutral Position: Refer to the operator's manual for instructions on adjusting the neutral position of the control levers. Make the necessary adjustments to ensure that the hydrostatic pump is fully disengaged in the neutral position.
   

Case Study: Operator Experience
An operator reported experiencing neutral creep on their John Deere 6675 after using the machine for snow plowing. The issue persisted despite multiple adjustments to the neutral position. Upon further investigation, it was discovered that the linkages were worn and the neutral adjustment was incorrect. After replacing the worn components and properly adjusting the neutral position, the neutral creep issue was resolved.
Preventive Measures
To prevent neutral creep from occurring:

• Regular Maintenance: Perform routine inspections of the linkages and hydraulic system to identify and address potential issues before they lead to neutral creep.
  
• Proper Operation: Always ensure that the control levers are in the neutral position when starting the machine and when not in use.
  
• Timely Repairs: Address any signs of wear or damage promptly to maintain the integrity of the machine's systems.
  

Conclusion
Neutral creep in the John Deere 6675 skid steer loader can be caused by worn linkages, hydraulic system issues, or improper neutral adjustments. By conducting thorough diagnostics and implementing preventive measures, operators can ensure safe and efficient operation of their machines.