885 hydraulics

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dunkie
Posts: 22
Joined: Wed Nov 30, 2011 8:30 pm
Location: Warwickshire

885 hydraulics

Post by dunkie » Sun Apr 27, 2014 8:23 pm

Hi everybody - latest hiccup in the restoration project - I have had my valve chest reconditioned - replaced dump valve seals - few other bits in the control mechanism and put it all back together - the arms seemed to work up and down and now nothing works in whatever position I have it on the 3 way valve and the selectamatic positions - I'm worried it's the pump? - thoughts please? Please tell me I'm missing the obvious somewhere. Thank you

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

RE: 885 hydraulics

Post by odin » Sun Apr 27, 2014 8:40 pm

Two problems I encountered doing this;-
1. Snott and rubbish blocking the valve on top of the axle at the right of the seat. Remove the 2 screws and plate and wind the right and valve out. Apart from there being a small gauze filter there is a very small orifice that just keeps blocking up. Mine did it five times until it settled . Its the price of having old contaminated oil going through the hydraulics.
2. Where the sensing cable goes into the axle casing behind a plate about 6 X 6inch held on with 2 screws. Make sure them fingers have located correctly and move freely. Once disturbed they can play up.

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

RE: 885 hydraulics

Post by erkki » Mon Apr 28, 2014 7:04 am

Also check that the control spool valve slides fully down when the control lever is back.

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ollek
Posts: 3898
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

RE: 885 hydraulics

Post by ollek » Mon Apr 28, 2014 2:10 pm

Did you change the oil in the transmission and the suction filter and cleaned the mesh screen when you did the valve chest? If you did not, you will now have dirt in the valve chest that has to be cleaned out as odin has told. If there is a lot of dirt in the oil, you may end up with a situation where you will have to remove the valve chest again and clean all the valves. But start with cleaning the by-pass and hold valves as this can be done without taking the valve chest out from the tractor. Also check that the spool vale is dropping fully down when the lever is fully back, as erkki have told. I do not think you have a problem with the pump, they are quite reliable and will not fail instantly, but will slowly loose pressure.

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dunkie
Posts: 22
Joined: Wed Nov 30, 2011 8:30 pm
Location: Warwickshire

RE: 885 hydraulics

Post by dunkie » Mon Apr 28, 2014 9:03 pm

Hi thanks - the oil and filter was changed before I did the valve chest - I may have some time to look at it again on Wednesday - will let you know"...

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