help 8050 hyd pump wine

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   dad and i recently blew some hydraulic lines and replaced all the lines behind the fuel tank on our 8050.  we also had a leak on the stearing motor and rebuilt it.  While we were at it we replaced the hydraulic filters under the rear end housing and changed the oil.  now the tractor has a whine that is very annoying.  it goes away when we raise and lower the disk and it picks up 100 rpm when we step on the brakes.  I have no idea what to look for.  our neighbor is a case tech rep and he thinks it's running full pressure all the time.  it sounds to me like it's sucking air.  does anyone have any suggestions?  thanks,

derek in Mo

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wekracer Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 13 Oct 2009 Location: Tebbetts, MO Points: 1587	Post Options Post Reply Quote wekracer Report Post Thanks(0) Quote Reply Topic: help 8050 hyd pump wine Posted: 06 May 2010 at 10:24pm
	dad and i recently blew some hydraulic lines and replaced all the lines behind the fuel tank on our 8050. we also had a leak on the stearing motor and rebuilt it. While we were at it we replaced the hydraulic filters under the rear end housing and changed the oil. now the tractor has a whine that is very annoying. it goes away when we raise and lower the disk and it picks up 100 rpm when we step on the brakes. I have no idea what to look for. our neighbor is a case tech rep and he thinks it's running full pressure all the time. it sounds to me like it's sucking air. does anyone have any suggestions? thanks, derek in Mo

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DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 20932	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 07 May 2010 at 6:40am
	Provided you installed the belly filters correctly, I'd guess you have one of those new hoses touching something under the cab or behind a fuel tank. They CANNOT tough the cab structure or an annoying "hum" will occur.

wekracer Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 13 Oct 2009 Location: Tebbetts, MO Points: 1587	Post Options Post Reply Quote wekracer Report Post Thanks(0) Quote Reply Posted: 07 May 2010 at 10:48pm
	DrAllis, thank you so much. I should have posted sooner but I've been planting beans. The hose from the pump to the valve stack that I repalced was touching the cab. Dad and I thought we had bigger problems. We were looking for a check valve or something holding the compensater open and we don't really understand how that sysetem works. We ran that tractor 12 hours today with no trouble other than a hydraulic line on the disk but I'll take that. Thanks again, Derek in Mo