John Deere CT332 Skid Steer Stops Moving After a Few Seconds

[MikePhua]

Introduction
The John Deere CT332 is a compact track loader renowned for its versatility and performance in various applications, from construction to landscaping. However, some operators have reported an issue where the machine starts and moves briefly but then stops after a few seconds. This problem can be perplexing, as it may involve multiple systems within the machine. Understanding the potential causes and solutions is crucial for efficient operation and maintenance.
Hydraulic System Pressure Issues
One common cause for a skid steer to stop moving is insufficient hydraulic pressure. The CT332's hydraulic system relies on a charge pump to maintain pressure. If the charge pump isn't circulating properly, it can lead to over-pressurization and inadequate hydraulic fluid temperature, causing the machine to stop moving. Operators have observed that at low idle, the pressure can reach approximately 480 psi, which is above the recommended 400 psi at fast idle, indicating potential issues with the charge pump .
Electrical and Safety Switches
The CT332 is equipped with various safety switches, including those for the seat and seatbelt, that ensure the operator is properly secured before the machine operates. If these switches malfunction or are bypassed incorrectly, the machine may not function as intended. For instance, bypassing the seatbelt switch can sometimes cause the machine to shut down unexpectedly . Additionally, issues with the glow plug system can affect engine performance, especially in colder temperatures .
Hydraulic Fluid Leaks
Leaks in the hydraulic system can lead to a loss of pressure, causing the machine to stop moving. Operators have reported instances where, after operating in cold conditions, hydraulic fluid leaks were discovered, often due to brittle hoses or fittings. In one case, a leak was found on a 3/4" line from the pump to the final drive, which required significant effort to repair .
Final Drive and Planetary Gear Issues
The final drive system, including the planetary gears, plays a crucial role in the movement of the skid steer. If these components fail due to lack of maintenance, contamination, or wear, the machine may stop moving. Common issues include damage to the ring gear and bearings, often resulting from metal-to-metal contact due to insufficient lubrication or contamination .
Diagnostic and Troubleshooting Steps
To address the issue of the CT332 stopping after a few seconds:

1. Check Hydraulic Pressure: Use a pressure gauge to measure the hydraulic pressure at the test port. Ensure it aligns with the manufacturer's specifications.
   
2. Inspect Safety Switches: Verify that all safety switches, including those for the seat and seatbelt, are functioning correctly.
   
3. Examine Hydraulic Fluid Levels and Leaks: Check for adequate hydraulic fluid levels and inspect hoses and fittings for signs of leaks.
   
4. Assess Final Drive Components: Inspect the final drive system for signs of wear or damage, particularly in the planetary gears.
   
5. Consult Error Codes: If available, retrieve any diagnostic error codes to pinpoint specific issues.
   

Conclusion
The John Deere CT332's sudden cessation of movement after a few seconds can stem from various factors, including hydraulic pressure issues, electrical switch malfunctions, hydraulic fluid leaks, and final drive component failures. By systematically diagnosing each potential cause, operators can identify and address the root of the problem, ensuring the machine operates efficiently and reliably.