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Message: <blockquote data-quote="Hoss54" data-source="post: 2332" data-attributes="member: 330"><p>Don't think there is a case drain filter. Checked the service manual, and no where does it say anything about one... You must realize..., this is the baby Bobcat... 16 hp Kohler..., and no fancy stuff on it. Not even an oil cooler.... Just two lines in, one from the hydrostatic pumps, and one from the control valve... one outlet.., directly to the tank. It goes into a T fitting, at the tank..., and the suction hose to the pump is also on this T. There are two poppet valves in this filter block. I assume to relieve pressure, so it won't blow the filter apart..., if the pressure flow is too great. One is in the return port to the tank, and the other goes no where. There is just a plug holding the pressure spring. It is factory.., shows it in the manual. They also use this block on the 453, which does have a cooler... I had it out, and apart, springs seem ok, and the valves seating properly... Let me ask you this.... There is a port, in the block just outside the poppet valve, from the top of the block. Is this where oil normally returns out of the filter, to the system?? It appears, that when the poppet valve is opened, it covers, or rather closes this port, protecting the filter. From this port.., to the hyd. tank is a direct shot. So when you shut it off, after a few minutes or less.. It's like the oil is gravitating to the oil tank, and air is coming back up the line... I heard it through a steel rod placed on the metal line... I've done it enough times..., I've checked them all, and it is the only place it does it... You can even feel it, and the tank gurgles when it does it... According to the Shop Foreman, the pressure in the filter block is only like 20lb. He checked to make sure..., when I told him I thought of trying to purge the filter block.... Once I purged that filter..., It worked like a charm... No foamy oil..., and I played with it for over an hour. Today..., it had the same problem. I tried to purge the system by cycling the lift, and dump..., while travelling.... Wouldn't do it..., and I worked it for almost 45 minutes... The port outside the poppet valve is what's got me wondering. What checks that oil flow, when it is shut down. The service manual does't show a cut away of the filter block. Just the removal and installation of the two poppets. That's why I'm wondering if I have a faulty filter block... Dave.</p></blockquote><p></p>

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