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| Just got done pulling our hair out on a 4640 with similar problem, a bolt had broken on plate on underside of rockshft housing that handle lube oil and part of the rubber gasket was gone, we had rebuilt two speed and clutch valve prior to figuring this out( two speed was making noise and was likely a victim of low lube pressure) This tractor would try to cavitate the pump when running drill fill conveyor was main reason we knew something was wrong. | |
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4440 low regulated PSI
