DB 885 Hydraulics: what next?

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User avatar
odin
Posts: 662
Joined: Sun Oct 31, 2010 9:31 pm
Location: Huddersfield, West Yorkshire.

RE: DB 885 Hydraulics: what next?

Post by odin » Sun May 04, 2014 9:13 pm

If the pump is good, (only way to check that correctly is with a hydraulic pressure/flow gauge). Then I would suggest that there is an internal leak between the pressure outlet of the pump and the spool valve ?
Could you try fitting a tipping trailer to the rear and see if the hydraulics will lift it?

User avatar
erkki
Posts: 2032
Joined: Sun Apr 09, 2006 12:02 pm
Location: North Finland

RE: DB 885 Hydraulics: what next?

Post by erkki » Mon May 05, 2014 4:29 am

Hmmm.

There can be a leak between the pump amd valve chest. Most probable is a worn 0-ring between the pump assembly and the pressure line, but a cracked line is not an impossible choice.
That makes the peak pressure disappear, especially when oil hot.

W.B.R erkki

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ollek
Posts: 3897
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

RE: DB 885 Hydraulics: what next?

Post by ollek » Mon May 05, 2014 7:02 am

Paddy wrote: "the 3-point raises and lowers fine and carries weight ok". Do you man that the 3-point hitch can lift loads of 1 ton or more as well as hold these loads? Paddy also wrote: "because the engine labours at certain valve settings". Do you mean that the hydraulics are loading down the engine when the 3-point hitch main control lever is pulled fully back against the return spring and the 3-way valve is in position L? If this is the case, the problem is not in the tractor, but in the loader valve. There might be an pressure valve in the loader valve that is partly open because of dirt.

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paperrustler
Posts: 110
Joined: Sun Sep 20, 2009 6:32 pm
Location: Exmoor

Ref 3 way vale o rings

Post by paperrustler » Mon May 05, 2014 7:49 am

Can you remember what size O rings were inside the three way valve. I need to do two of my 885 as oil is dripping from the valve all of the time.

DB770.DB880
Posts: 673
Joined: Tue Jan 15, 2008 12:36 am
Location: N.B. Canada

RE: Ref 3 way vale o rings

Post by DB770.DB880 » Mon May 05, 2014 12:59 pm

The two oil ring on the spool valve is 7/16" Int. dia. Part #K24779,use the correct one if not it wont last any time.

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