Greetings everyone! It's great to finally share my thoughts after lurking in the shadows for a while. I appreciate any assistance you can provide in addressing this issue. Here's the background information for my inquiries: I own a 2014 John Deere 333e Compact Track Loader with a Yanmar 4TNV94CHT engine. Recently, while operating the machine with low fuel, it unexpectedly shut down at full throttle. Despite refueling, it refuses to start and only cranks without any smoke emission, even after using ether. Upon testing the SCV ohms, I found it to be reading 4 ohms, exceeding the recommended range of 1.9-2.2 ohms as per technical specifications. Could this indicate a faulty SCV? I'm hesitant to invest in a costly replacement without certainty of resolving the issue. Additionally, when conducting the ohms test, should I measure from the two prongs or from each prong to the body of the SCV? It's important to note that the correct method is to test the ohms between the two prongs. Measurements from each prong to the body of the SCV yield no results.
Welcome to HEF Junk333e! Have you checked the monitor for any codes? Please share any active or stored codes. To access the service mode and clear codes, hold down the menu button until "service mode" appears. After clearing the codes, try starting the device to see if any codes return. Use a multimeter to measure the Ohms by probing the two SCV prongs. Keep in mind that the temperature during the reading can impact the results.
mg2361 welcomed you to HEF Junk333e! Have you checked the monitor for any codes? Share both active and stored codes here. To enter service mode and clear the codes, press and hold the menu button until "service mode" appears. Once cleared, try starting the system again. Keep in mind that the temperature when reading Ohms using the SCV can impact the results. @mg2361, I appreciate the prompt response! I had several codes related to fuel pressure and temperatures before and after shutdown. After clearing the codes, I attempted to start the system and noticed issues with fuel pressure rail and others. When testing the prongs, the air temperature was around 68°F or slightly lower, as per specifications. How can you identify a faulty SCV? Would it exhibit higher or lower OHMS? I assume higher OHMS, but could it short out if defective? I'm considering a pump rebuild for under $3k, which includes the sensor and valve. The system has been out of commission for two years, causing financial strain. With funds from selling our house, I'm ready to tackle the issue and get back to work. Your insights are valuable! If there are other users who could contribute to this discussion, feel free to invite them. I'm eager to resolve this matter as I need the system operational to process logs for our new home construction and income generation.
I believe that it is likely self-priming or has already gone through the priming process. This feature makes it easy to start using without the need for manual priming.
Can you provide the specific code numbers (xxxxxx.xx) for further analysis? This information is crucial in determining the next steps. I can also send you specific diagnostics through private messaging. Keep in mind that diagnosing the SCV accurately requires diagnostic software. Currently, a reading of 4 ohms shouldn't be a major concern as it could be due to the meter's accuracy. However, a lower reading would be more alarming. When dealing with fuel-related codes on a HPCR engine, it's important to first rule out fuel supply issues. Any problems in this area could trigger other fuel system codes, leading to challenging diagnoses. Have you confirmed the low pressure system with a gauge tee'd at the HP pump inlet? Regarding the possibility of the SCV being the issue, it's unlikely to be the pump as they are known for their durability. It may be worth considering a rebuild pump for under 3k, which includes the sensor and valve.
mg2361 inquired about the specific code numbers (xxxxxx.xx) needed to determine the next steps and offered to provide specific diagnostics through a PM. Diagnosing the SCV accurately requires diagnostic software, with minor concerns about the 4-ohm reading possibly being influenced by meter quality. Fuel supply issues must be ruled out first when dealing with fuel-related codes on an HPCR engine to avoid complications in the fuel system. Have you confirmed the low-pressure system with a gauge at the HP pump inlet? Typically, the pump is not the issue as they are quite robust. In a detailed account, the machine experienced issues with running at full throttle and dying, leading to repairs by CL Boyd after a harness replacement and fixing reversed fuel lines, costing over $5k. Subsequent issues included plastic from the fuel tank blocking the primary fuel supply line, with further complications arising from overheating during heavy use. Various codes were recorded over time, indicating potential ECU issues due to overheating or other factors. Numerous codes were documented, suggesting issues with hydraulic oil temperature, battery voltage, water in fuel switch, mechanical faults in joysticks, and abnormal data rates, among others. Recent codes indicate further problems with rail pressure sensor, EGR sensor, SCV MPROP, and auxiliary hydraulic channels. A detailed account of previous repairs and diagnoses is provided, including a breakdown of labor and parts costs. Your assistance and input are greatly appreciated!
Answer: One possible cause could be low fuel levels. Operating the machine with low fuel may trigger a shutdown to protect the engine.
Answer: If your loader only cranks without emitting any smoke, it could indicate issues with fuel delivery or combustion. Check the fuel system and consider testing components like the SCV (Selective Control Valve).
Answer: An SCV ohms reading of 4 ohms exceeding the specified range could indicate a faulty SCV. This component plays a crucial role in controlling hydraulic functions, and a malfunction could impact machine performance.
Answer: It is recommended to thoroughly diagnose the issue before investing in a replacement. Consider consulting with a knowledgeable technician to confirm if the high ohms reading is indeed the root cause of
Join hundreds of satisfied customers who have transformed their maintenance processes.
Sign up today and start optimizing your workflow.