CAT 248 Hydraulic Load Causing Slow Crank and No Start: Troubleshooting and Solutions

[MikePhua]

1. Problem Overview
One of the common issues that operators may encounter with the CAT 248 skid steer loader is a slow crank or no start condition caused by hydraulic load. This issue can prevent the machine from starting up properly, potentially affecting its overall functionality. In this article, we will discuss the causes and potential solutions to address this problem.
2. Symptoms

1. Slow Crank
   When attempting to start the CAT 248, the engine may crank slowly or appear to struggle to start. This can often be attributed to excessive load on the hydraulic system.
   
2. No Start
   In more severe cases, the machine may not start at all, possibly due to issues with the electrical system, fuel delivery, or hydraulic components.
   

3. Potential Causes

1. Excessive Hydraulic Load on Start
   The hydraulic system in the CAT 248 plays a crucial role in various functions, including lifting and moving heavy loads. If the hydraulics are under load when starting the machine, it can cause a significant drag on the engine, leading to a slow crank or complete failure to start. This issue can occur if the hydraulic pump is engaged, or if there is residual pressure in the system preventing the engine from turning over smoothly.
   
2. Weak Battery or Faulty Starter Motor
   Another possible cause of slow cranking is a weak battery or a malfunctioning starter motor. If the battery is not providing enough power to the starter, or if the starter motor is faulty, the engine may struggle to turn over, causing a slow start.
   
3. Hydraulic Fluid Contamination or Blockage
   Contaminated or blocked hydraulic fluid can put extra strain on the hydraulic pump, which in turn affects the overall system performance. A restricted fluid flow can create excessive pressure, adding to the engine's load and making it difficult to crank or start.
   
4. Electrical System Issues
   Issues with the electrical components of the CAT 248 can also cause the machine to crank slowly or not start at all. Problems with wiring, relays, or fuses could disrupt the flow of electrical current to key components, including the starter motor and hydraulic system.
   

4. Solutions

1. Check Hydraulic Load
   Ensure that the hydraulic system is not under load when attempting to start the machine. If there are any attachments or hydraulics engaged, make sure they are in the neutral position before attempting to start the engine. This will help reduce the load on the engine and allow it to crank more effectively.
   
2. Inspect the Battery and Starter Motor
   A weak battery or faulty starter motor is another potential culprit. Check the battery voltage and ensure it is fully charged. If the battery is weak, replace it with a fully charged one. If the starter motor is malfunctioning, it may need to be repaired or replaced.
   
3. Examine Hydraulic Fluid
   Inspect the hydraulic fluid for signs of contamination, such as discoloration or particles. Ensure that the hydraulic system is clean and free of blockages. If necessary, flush the system and replace the hydraulic fluid to prevent additional strain on the system.
   
4. Check the Electrical System
   Inspect the wiring, relays, and fuses for any signs of wear or damage. Make sure that the electrical components are functioning properly and providing the necessary current to start the engine.
   

5. Conclusion
The issue of slow cranking or no start in the CAT 248 skid steer loader due to hydraulic load is primarily related to an overworked hydraulic system, a weak battery, or electrical and hydraulic system malfunctions. By checking for hydraulic load, inspecting the battery and starter motor, and ensuring the hydraulic fluid and electrical systems are in good condition, operators can troubleshoot and resolve the issue, restoring the machine to full functionality.