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860 relief valve ?

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bball

06-05-2004 17:42:10




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I was rained out today so I tested my hydraulic pump pressure as per the IT specs. It says that the relief valve should unseat at around 1950psi. This will be evident by bubbling and buzzing in the relief valve area. Set up at about 700 RPMs w/ accessory plate on as directed (backward w/ gasket in between). MY question is: IS this buzzing or bubbling extremely audible? I couldn't hear much down there over the engine exhaust. Ive never heard one unseat so I don't know how loud it will be. My gauge only reached about 450psi (ridiculously low) so I'm wondering if the relief valve may be 'permanently unseated' or the vane pump is just that whipped. Thanks as usual. PS I recently replaced the PTO shaft w/ an 1 3/8" . The new one fit extremely tight (tight like tapping the last 1 1/2" in w/ 3# hammer: OK REALLY tapping it in.) THe old shaft would slip right in and out. Once I got it in, started tractor, kicked in PTO and instantly killed tractor. Restarted tractor, let warm up, then kicked in PTO, really bogged down tractor, let run for a while, and seemed to handle it. I hogged for about 3 hours yesterday and an hour today and it seems OK. IS there anything I may have jammed up and am currently destroying or is this normal until everything 'meshes' together? Thanks, Brad

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Dave H (NY)

06-06-2004 05:16:06




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 Re: 860 relief valve ? in reply to bball, 06-05-2004 17:42:10  
You should be able to install and remove the PTO shaft with hand pressure and should be able to turn it when not engaged without a problem. If not you are going to have to pull the shaft and see if the problem is in the shaft or the collar in the tractor



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bball

06-06-2004 12:33:02




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 Re: Re: 860 relief valve ? in reply to Dave H (NY), 06-06-2004 05:16:06  
Dave,
Thanks. I can EASILY turn the shaft by hand when not engaged. I think the new shaft must have just fit tighter into the collar. I actually had the pto engagement lever/ round cover off so I could reach in and make sure the splines were lining up. It just fit very tight. Should be OK don't you think? Any ideas about the relief valve? 400 PSI seems really low (even for a shot pump) Maybe not? Thanks, Brad

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Dave H (NY)

06-06-2004 16:54:04




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 Re: Re: Re: 860 relief valve ? in reply to bball, 06-06-2004 12:33:02  
The pump does not control when the valve lets go, but if you are only getting 400 psi from the pump you are probably haveing a tough time lifting even light attatchments.



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bball

06-06-2004 19:16:51




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 Re: Re: Re: Re: 860 relief valve ? in reply to Dave H (NY), 06-06-2004 16:54:04  
1. If I can turn PTO by hand, it should be OK?
2. The pump builds the pressure in system, Relief unseats at 1950 +/- psi, IF the relief is 'permanently unseated', Would I have any pressure in the system? The gauge immediately went to 400 psi and never really climbed.
3. You are correct, at 400 psi it will lift even a 6' bushhog, however, after 20/30 minutes, it's dragging it around the field.

Thanks Brad

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Dave H (NY)

06-07-2004 03:55:56




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 Re: Re: Re: Re: Re: 860 relief valve ? in reply to bball, 06-06-2004 19:16:51  
If you can turn the PTO by hand you should be ok, as far as I know if the valve is open no pressure at all will build as this is a safety feature and when the valve opens it alows the fluid to just return to the reservoir, after the hydraulics stop lifting if you let the tractor cool and begin using it again and it starts to lift again it sounds like it may be time to swap for a piston pump.



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bball

06-07-2004 20:13:13




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 Re: Re: Re: Re: Re: Re: 860 relief valve ? in reply to Dave H (NY), 06-07-2004 03:55:56  
Thanks Dave! The cold hard truth is stated. I suppose I was hoping against the harsh (expensive) reality. I guess it's best for the long run. Thanks again for your thoughts. Brad



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