1840 with what seems to be a unique problem

[buckwheat_la]

So I am a new poster here, my shop does all its own repairs on our equipment, which is mainly skidsteers and loaders. So we have a 1840 from 1996, and this unit seems to have a problem that no one can explain. It keeps shearing off the bolts that hold the pump to the flywheel. We have replaced and repaired everything, from the splines, the base plate, the bushings, and yet never fail, every 3-6 months that damn pump sheers one or both bolts. Anyone have any suggestion?

 

[jerry]

Would almost have to be alignment or motor mounts at this point wouldn't you think? When it goes bad are you pulling the engine or the pump ?

 

[buckwheat_la]

Would almost have to be alignment or motor mounts at this point wouldn't you think? When it goes bad are you pulling the engine or the pump ?

The motor mounts seem fine. I agree with you that it seems to be a alignment issue, but it is sitting properly on the spline, and the mounting plate seems to be square too. Now that mounting plate had a little wear in it, but we had it filled in and machined flat again, so I am really not thinking that is the problem. When we take it off, we take the tandem pump off. Keep in mind that the pump is only supported by that backing plate

 

[jerry]

The motor mounts seem fine. I agree with you that it seems to be a alignment issue, but it is sitting properly on the spline, and the mounting plate seems to be square too. Now that mounting plate had a little wear in it, but we had it filled in and machined flat again, so I am really not thinking that is the problem. When we take it off, we take the tandem pump off. Keep in mind that the pump is only supported by that backing plate

I would still be suspicious of the motor mounts though. Not knowing what you have there it seems you would have to remove the coupling and put the pump in place and then rig a dial indicator or at least a pointer to check alignment. If you could machine a solid ,true piece that would attach to the engine and have a bore on the other end to accept the spline and put it in place of the coupling just to see if they are in line. Big pain in the neck no matter what though. The mounting plate wearing must mean something is wiggling the pump around a little.

 

[Tazza]

I would still be suspicious of the motor mounts though. Not knowing what you have there it seems you would have to remove the coupling and put the pump in place and then rig a dial indicator or at least a pointer to check alignment. If you could machine a solid ,true piece that would attach to the engine and have a bore on the other end to accept the spline and put it in place of the coupling just to see if they are in line. Big pain in the neck no matter what though. The mounting plate wearing must mean something is wiggling the pump around a little.

I wonder if the bolts that you use to replace them with are a little too hard causing them to break. There is a fine line between the harder bolts that are slightly more brittle than the softer ones that are less brittle.
I too would suspect alignment first, it doesn't take much to cause vibrations that will fatigue a bolt.

 

[dferrera777]

Hi, the 1845 machine has a y-shape bracket bolted to the back of the second pump down bolted to the frame cross member to stabilize the weight. I bet along the way someone forgot to put it back on or got lazy.. check to see if you have unused holes in the frame there. Imagine all the pounding and up and down and wobbling that triple pump is trying to do while your machine is bouncing around, especially if you have solid tires (ouch). Also use grade 8 bolts on those connections. for what its worth Dave