DB 885 Hydraulics: what next?

[odin]

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?

[erkki]

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

[ollek]

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.

[paperrustler]

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]

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.