Have you experienced thrust bearing failure in Komatsu SAA6d-140E engines or other similar models? I have been investigating an engine issue in my Komatsu site truck and discovered excessive crankshaft end play, affecting the clearance of the Ne sensor for engine RPM. Despite no pressure from a clutch, I am curious if others have encountered similar problems. Share your experiences with thrust bearing failure in Komatsu engines.
Witnessed the gear teeth shearing off...
It appears that this engine utilizes three crescent-shaped components for propulsion. If there was an issue, one of them may have detached, potentially causing a chain reaction with the others. Have you inspected the torque assembly thoroughly? Even without a clutch, there could still be an underlying problem that led to significant propulsion issues. A malfunction in the torque, or a possible shift in the engine or transmission within their mounts, could result in minimal clearance between the torque and transmission. Check the front differential mounts for any signs of loosening, as this could potentially lead to the transmission shifting towards the engine. I'm currently referencing online parts catalogs for potential solutions and suggestions.
Thank you for your responses. The engine does not have a torque converter, but instead features a drive damper similar to an excavator and a drive shaft leading to the transmission. The transmission is equipped with a PTO and torque converter, mirroring the setup found in Komatsu W500 loaders, which also share the same engine. Upon inspecting the service manual, I noticed that the thrust bearing shells are supported by roll pins. I suspect that when I have the opportunity to remove the engine, I will discover that the roll pins have sheared off and the bearings have fallen into the pan. I have a strong rapport with the local dealer, who searched for any relevant service bulletins on this issue, but unfortunately, they were unable to find any information.
I made a guess about the age of your truck, but it looks like I was off the mark! Best of luck with your vehicle.
Today, I had the opportunity to remove the engine and inspect the bearings and crankshaft. Unfortunately, the rear-facing thrust bearing is worn down to the steel and the crankshaft has significant scoring. Upon further examination, I found no issues with the drive damper that could have caused thrust against the crankshaft. Can anyone recommend a professional who specializes in spray welding and regrinding crankshafts? Alternatively, does anyone know where I can find a cost-effective replacement crankshaft for a SAA6D-140E3 engine?
Answer: Common signs of thrust bearing failure may include excessive crankshaft end play, which can impact the clearance of the Ne sensor for engine RPM.
Answer: Excessive crankshaft end play can lead to the misalignment of engine components, such as the Ne sensor, affecting its clearance and potentially causing issues with engine RPM readings.
Answer: Thrust bearing failure in Komatsu engines can be caused by various factors such as improper lubrication, excessive engine load, or manufacturing defects.
Answer: To prevent thrust bearing failure, regular maintenance, proper lubrication, monitoring of engine load, and early detection of any abnormal engine behavior are essential steps to take.
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