Bobcat Tool Cat 5600 Cranks But Won’t Start: Diagnosis and Solutions

[MikePhua]

The Bobcat Tool Cat 5600 cranks, but fails to start. While the starter motor runs fine, the engine does not ignite, causing the equipment to remain non-operational. This issue is likely related to the fuel system, ignition system, or electrical system.
Potential Causes

1. Fuel Issues
   • Low Fuel Level: The first thing to check is the fuel level to ensure there is enough fuel in the tank to supply the engine. If the fuel level is low, topping it up may resolve the issue.
     
   • Clogged Fuel Filter: If the fuel filter is clogged with debris, it can block fuel flow to the engine, leading to starting problems. Check and replace the fuel filter if necessary.
     
   • Fuel Pump Failure: A malfunctioning fuel pump could prevent fuel from reaching the engine. Check the fuel pump's operation and replace it if it’s faulty.
     
2. Ignition System Failure
   • Ignition Coil Issues: If the ignition coil fails, it can cause poor or no spark, preventing the engine from starting. Inspect the ignition coils and replace them if necessary.
     
   • Spark Plug Problems: Faulty spark plugs or excessive carbon buildup can cause ignition problems. Check the spark plugs, clean or replace them as needed.
     
3. Electrical System Problems
   • Battery Issues: Even if the starter motor is turning, a weak battery may not supply enough power for the engine to start. Check the battery voltage and charge level, ensuring the battery is clean and the terminals are free of corrosion.
     
   • Starter Relay or Fuse Failure: A faulty starter relay or blown fuse can interrupt the start-up sequence. Inspect the starter relay and fuses to ensure they are functioning properly.
     
4. Sensor or Control System Malfunctions
   • Engine Control Module (ECM) Failure: If the ECM fails, it can disrupt communication with sensors and prevent the engine from starting. Check the ECM and related circuits.
     
   • Safety Switch Issues: Safety switches, such as the seat switch or operator presence switch, can prevent the engine from starting if they are not engaged correctly. Make sure all safety switches are operating as they should.
     

Troubleshooting Steps

1. Check the Fuel System: Ensure that there’s sufficient fuel in the tank, and check that the fuel pump and fuel filter are functioning correctly. Replace or repair components as needed.
   
2. Inspect the Electrical System: Verify that the battery is fully charged and clean, and check the starter relay and fuses for proper function.
   
3. Examine the Ignition System: Test the ignition coils and spark plugs to ensure they are in good condition. Clean or replace the spark plugs and ignition coils if required.
   
4. Inspect Sensors and Control Systems: Check the ECM and relevant sensors for proper operation. Ensure all safety switches are engaged as required.
   
5. Diagnostic Tool Testing: Use a diagnostic tool to scan for any fault codes that may point to sensor or system issues, helping to pinpoint the exact problem.
   

Conclusion
The Bobcat Tool Cat 5600’s starting issue may be related to several areas, including the fuel system, ignition system, electrical system, or sensor and control system failure. By systematically checking each of these systems and addressing any identified issues, you can restore the equipment to its full operational capacity. If these steps do not resolve the problem, it is advisable to seek help from a professional technician.