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Message: <blockquote data-quote="hmw" data-source="post: 3893" data-attributes="member: 597"><p>Hi, new to this forum. Recently bought a 440b with the same symptoms you mentioned. I recently "re-hosed " this machine for a customer. About 3 months later the engine blew up and I bought it from the customer. I am a hydraulic and equip technician for a local electric utility co and i work on all kinds of aerial devices and hydraulic equipment[ bucket trucks, trenchers etc]. I have worked on this machine several times on different repairs including fabricating a new bucket for it and noticed the hyd system jumpy. Of course the customer is not willing to pay to have it diagnost so on it went. Now that i have it and the engine is out [I have a new "v" Kohler to go back] I was thinking about the cavitation problem and had pretty much decided it had to be the pump. On this model the oil tank is below the pump which with any kind of "suction" problem makes it worse. After reading your article I think i will overhaul the pump before installing the new engine. The previous owner said it had been "jumpy" ever since he had it. He bought it used. Its a 95 yr model. It only takes a pump being run low on oil, especially one that has to "draw" its oil, one time to damage plates and or seals. so thanks for the post and I'll let you know how i make out. I still have to fab a new muffler for the new Kohler and then I'll pull the pump out. thanks again</p></blockquote><p></p>