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Message: <blockquote data-quote="OldMachinist" data-source="post: 50948" data-attributes="member: 437">The original pump spec is 6.8 gpm so I'd have the pump done or do it yourself. You can get the pump out pretty easy and put a rebuild kit in it. But if its got internal damage they don't make the orignal Cessna pump anymore and the only replacement if a little longer requiring either removing the engine/pump assembly or cutting a hole in the side of the machine.<a href="http://www.loaderpartssource.com/bobcat-parts/bobcat-hydraulic-pumps/hydraulic-pump-for-bobcat-440-440b-443-443b-450-and-453-7003484.html" target="_blank">http://www.loaderpartssource.com/bobcat-parts/bobcat-hydraulic-pumps/hydraulic-pump-for-bobcat-440-440b-443-443b-450-and-453-7003484.html</a>Air in the system can do damage but it depends on how long it been operated like this. The dipstick tube being loose should only cause a leak.</blockquote>