greenerdreams
Bronze Member
- Joined
- Apr 7, 2009
- Messages
- 62
Hello, I have been lurking on this site for quite a while and decided to finally register. I have an older small omc mustang bobcat that has recently started having a problem. The lift and dump cylinders are run by a seperate gear pump from the drive motor pumps. This pump has started to shudder for no better word approximately 10-15 minutes after I run the tractor, the shudder will progressively get worse and louder until the lift/dump system will almost not work and react very slowly. Even when the problem is occurring the pump seems to be producing adequate pressure, just not flow or possibly cavitating. I do not see any external leaks, but cannot check the pickup strainer without dismantling the entire drive bay which is a pain. What is very weird is the fact that the system will work fine again after I let the tractor sit for a while(the fluid doesn't even need to cool). It doesn't look like the fluid is getting aerated. My question is whether anyone has a troubleshooting plan that may help me diagnose the problem. As of now I don't know if it is a pump or valve or pickup problem. I have ruled out the cylinder circuits since they hold pressure and position. BTW the pump was replaced maybe a few hundred hours ago and there is no filter on this circuit only a in tank pickup strainer.
Any help would be appreciated.
Any help would be appreciated.