Schifference
Well-known member
- Joined
- Sep 23, 2020
- Messages
- 86
I have a Bobcat 642 and the right hydro motor makes all kinds of noise and is almost non-responsive. I switched the hoses on the pump from front to back on both sides so that the right handle operates the left hydro motor and the right operates the left. When I did that the problem was no longer on the right side but the left. According to previous posts here and logic, the motor is not the problem but the pump. It has been said that taking the pump out and sanding the swash plates, Wafer plates, and sanding/resurfacing would likely solve the issue. I was fortunate enough to have a moderator Tazza from an old thread respond and offer input on how to do the project. When I put it back in, I hooked up the hoses and filled the reservoir as soon as possible. I left the highest connection undone so the air could bleed out. There was still some air in when I first started the machine. I first raised and tilted the bucket. The hydro's were screaming a bit. I worked the bucket up and down and tilted some more. I drove forward and backward without any turning. The right still seems to be noisier, but some of that could be air. I only ran it for a few minutes then tried it again. All in all I think it is much better. The right motor definitely has power now and moves. I think a few short sessions and air evacuation will probably make it about as good as it will get. Either way, I am not taking it apart again now. If I need to in the future, I have the experience of knowing what is inside. I didn't even mess with anything except the splash plates. I didn't want to risk making it worse and had hopes the splash plates was all it needed. If anyone is interested here is a short video of what I did and what you should expect. https://youtu.be/dq7mPfM__xI