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Case Tractors Discussion Forum
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DB880 hydraulics

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Tony Dudley

04-08-2006 10:49:48




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Hi All, hope you can offer some help. I've just bought a David Brown 880, it's my first tractor and I'm having problems. The hydraulics aren't working, changed the gearbox oil (looked like mayonaisse), and the filter. Still no hydraulics. Any advice please. Tony.




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Tony Dudley

04-16-2006 13:47:34




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 solution found in reply to Tony Dudley, 04-08-2006 10:49:48  
OK, so I bit the buttlet and removed the PTO. to find not a knackered hyd. pump as expected. but a broken circlip.

The retaining circlip for the idler gear had broken allowing the the gear to move off the shaft enough to no longer mesh.

Hence absolute hydraulic failure.

Nice and easy and cheap to fix.

Thanks for the advice everybody.

Tony.



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cj3b_jeep

04-10-2006 08:31:33




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 Re: DB880 hydraulics in reply to Tony Dudley, 04-08-2006 10:49:48  
Tony, I bought an 880 last spring and the three point on mine did not work either. Mine ended up being a mechanical problem in the valve linkage, only cost about $80 in parts from the local Case dealer to fix, I got alot of help from Elmer and Glenn in Canada. Is this the Red 880 or the white one? Where are you located? It's a good starting point to drain/replace the hydraulic fluid. Check that screen on the bottom next.

Get the I&T shop manual. It covers a lot of the DB models at the same time, but mine was and is priceless when it comes to fixing things.

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Tony Dudley

04-10-2006 11:11:04




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 Re: DB880 hydraulics in reply to cj3b_jeep, 04-10-2006 08:31:33  
Hi, thanks for the advice all. checked the relief valve all clear but no oil pressure there either. So it"s the hyd pump. can gat a new one for �235, and wiating on a price for second hand one. I need to wait now for the workshop manual that is on order. I don"t facny major de-construction without more knowledge of what I should find. Thanks

Tony.



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Tim Pennell

04-11-2006 09:08:55




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 Re: DB880 hydraulics in reply to Tony Dudley, 04-10-2006 11:11:04  
Hyd pump on the 880 is quite simple really. Remove the PTO housing off the back and its right there, can't miss it. Of course you have to drain oil first. Pump runs off the output shaft that drives the pto. If you have a hitch then you need to remove that as well in order to pull the pto assembly off.

Tim



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RPoff

04-10-2006 04:36:57




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 Re: DB880 hydraulics in reply to Tony Dudley, 04-08-2006 10:49:48  
Post for Elmer or Barry. They are both very knowledgeable and are both very friendly gentlemen. DB tractors are easier to own if you contact one or both. Good luck.



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Tim Pennell

04-08-2006 18:58:56




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 Re: DB880 hydraulics in reply to Tony Dudley, 04-08-2006 10:49:48  
Also pull the filter in the round drop down case on the bottom of the tranny area, water/oil mix tends to plug the filter badly with goo..... yes thats the technical term, goo ;o)

There is a bypass valve that will stick also RH side under an oval plate, you can bleed it there, IT&T manual has the instructions. DB hydraulics are somewhat finnicky but when they work, they work great. Also check your gear shift boots, that is most likely the source of the water, Another famous DB item. Elmer on the site here can get you a great deal on replacements for them.

Tim

PS How's the engine in your 880? I have one for sale :o)

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Walt Davies

04-08-2006 12:55:50




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 Re: DB880 hydraulics in reply to Tony Dudley, 04-08-2006 10:49:48  
The oil has lots of water in it you will need to completely flush the entire system with something like a good cleaner be careful not to run the engine too much just enough to circulate the cleaner some. then drain and keep working up with very light oil to the oil that is called for. You may not get it all out but that's ok.
While you have it drained check the hydraulic pump for proplems by removing it. Always start at the source then move out to find your problem. OIL leval to pump to lines to controll valves and any pressure relief valve along the way.
Now is a good time to get a book on the hydraulics to help with following the flow. Walt
PS Hydraulics are more confusing to the person with no actual experiance because of all the little valves that control it along the way to the rams. Also there are two main types full pressure like JD and pressure on demand like Case. GOOD LUCK you need it. And look for a friend who has experiance on the system that will always help.

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