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Message: <blockquote data-quote="skidsteer.ca" data-source="post: 7170" data-attributes="member: 307">They all moan and groan some, especially when pushing hard or if rpm is low. That pretty normal for any skid I have ever sat in. (bobcat, deere, new holland) However groaning gets worse if you have problems, so its tough to call it based on that alone.When you say the filter colapsed , I'm wondering if the bypass is disabled and the pressure differential crushed the  element??Most of the time one side just gets lazy as the oil warms up if the motor is bad. Yours sounds more like a charge issue, or could just be a sender. You need to ge the pressure guage out to verify this. Perhaps change the filter and open the old one and see if there is any new trash.We have had our old serco (around 86 vintage, model 200, 3208 Cat. for 8 years now.We bought it as a fixer upper (at 7600 hours, motor was smoking some, needed injectors, center boom knuckle  was worn bad, and the 1/2 serco bypass clam was busted though the cross member of the jaw on the prong side, lots of new steel and welding) and have used it 1000 to 1500 hours for loading tree lenght and slash and load 100". Its a good basic design that is easy to service and repair and rugged as hell. Those twin 6" main lifts just won't give up.It has handled 15000 or so cords for us now will vary little trouble. However I need to pull the center manifold out and re seal it now. It leaks when it feel like it while the unit is sitting and loose all its hyd oil. Thats a job I'm not looking forward to.</blockquote>

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