HELLO TO ALL, my machine ate another splind coupling. cannot figure out what is wrong. anybody have this problem? wlbrown
Can we have a little more info pls. Like what kinda machine, hours on if a frequency it eats couplings?
HELLO TO ALL, on my first post,"backhoe up, and running" i gave the details of changing this coupling. since then the machine has had just a few hours on it. after the install, the machine ran, and did fine, then lost hydraulic power, and this was due to the internal splined coupling being damaged, and losing the connection to the pump. as i said, i am trying to figure out why this has happened. wlbrown
Is something misaligned or loose that the alignment could change when the pump has a load? Is the coupling rated for the load that is being applied? Somebody familiar with that machine might have some ideas.. On a 590 the pump bolts onto the front motor support casting. If a bolt was loose or broken there, the pump might move around. I don't know what a 530 pump mount looks like.
HELLO TO ALL, no, nothing loose, the pump bolts up to the front of the frame with two large bolts. there cannot be very much misalignment because of the bolt holes. we now have the pump apart, and are looking at the splines on the pump shaft. these are damaged slightly, and this could be why it is "eating" the coupling. we are thinking about tig welding the damaged splines on the pump shaft, and possible remachining of the splines. welding this would casue it to be very hard, and i have reservations about recutting the splines, in this condition. good luck to all. wlbrown
If you can find out what material the shaft is, you will have a better idea of the weldability. You would probably need a pretty high preheat and slow cooling to weld up the shaft without having it crack. Materials for that application may be quenched and tempered, so you would have variations in material hardness as well as possible cracking and residual stress from welding to think about. Most likely it could be repaired if no other options exist, but if another shaft or pump can be used, that might be simpler, less work and more reliable.
FOLLOW UP, we welded up the damaged splines on the pump shaft, and i remachined them. i was talking to my friend who did the mechanical work. he had installed two large washers, between the pump, and the frame because the shaft that drives the pump is a little too long. i guess his eyesight is like mine, pretty bad. he brought the two washers for me to check, and i immediately saw what might be the problem. one washer was thicker than the other, and this in my opinion would make the pump set at an angle. i said, i will machine two new washers, and these will be exactly the same thickness. this is what i did, and the machine is now running again, and hopefully not have anymore problems. good luck to all. wlbrown
Just guessing here as I'm not at all familiar with your machine. I just got back into the backhoe game...bought an old ** hoe. It is eating splines out of the pump driveshaft. I found out this is due to the steering cradle bushings being worn...this causes the shaft to run way out of line and the pump shaft...being harder...eats the female spline in the driveshaft. Russ