Find the cause of the failure of shaft N in the metering pump

Thread Content

I am seeking an explanation for the breakage of shaft N and the damage to the bearings in the hydraulic diaphragm metering pump. The new pump had been in operation for less than a month; there were no issues such as lack of oil or pressure buildup, and it operated smoothly throughout that time. On February 20th, the operator reported problems: the motor experienced overcurrent and shut down, the pump shaft turned stiffly, and the plunger would not move. Upon disassembling the pump, it was found that shaft N was broken and the bearings were damaged. The bearings in question were 7005 type bearings mounted face-to-face on shaft N. On the 21st, the manufacturer sent a new shaft N and bearings, and after reassembly the pump operates normally now. 1. I hope experts can help analyze the reasons for the shaft breakage and bearing damage. 2. What type of bearing is the 7003 type, and what is its contact angle? 3. Why choose face-to-face installation? Can’t back-to-back installation be used? 4. Also, how to upload images in JPG format, with each image being 6000 to 8000 KB in size. 5. What does “No valid images were uploaded” mean when an upload fails? There are images with N axes, but I don’t know how to upload them. There are a bit too many questions, haha. I hope all the experts out there can lend a hand and help me resolve these doubts. Thank you!