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2840 SCVs

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Bob Angus

08-13-2014 13:13:01

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When I resealed my rocksshaft I noticed scvs leaking dumping oil into the sump. Took it to local hydraulic shop to save time. Put it on today. Outside valve wasnt returning to detent. Leaked and didnt work right. Took valve apart and found spring between parts 4 and 22, and only 1 set o and backing rings on pressure valves. Shouldve done it myself. My question is about the bushings for the spools. Two are different and have a smaller diameter shoulder. Do they go with pressure or return ? Shoulder pointing to valve bore or bottom plate. Thanks in advance, Bob

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Tech 7

08-14-2014 05:42:35

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 Re: 2840 SCVs in reply to Bob Angus, 08-13-2014 13:13:01  
I wouldn't be taking any more SCV's to that shop. I think Tim S who is on this board a lot has them shipped to him. I do a lot of them here, usually flat 3 hrs including testing so they will work and not leak when they get home.

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Bob Angus

08-14-2014 07:57:55

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 Re: 2840 SCVs in reply to Tech 7, 08-14-2014 05:42:35  
Where are you located and what is the turnaround time? I am in PA. I took it to this shop to save myself time. Tractor has been down 2 weeks now. What a disaster. I made the adjustment tool last night to do it myself. I've done the couplers, I just have the 2 valves to do. If I can find someone to do it right for a fair price and in a reasonable time I might be interested. Thanks, Bob

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Tim S

08-14-2014 09:01:51

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 Re: 2840 SCVs in reply to Bob Angus, 08-14-2014 07:57:55  
If you already have new parts in it, mainly the 4 poppet valves,, I will open it up ,,sort it out,, and bench test it for $250,, 740-743-1085 4454 Stage Coach rd. Somerset Ohio 43783,,,,just seal it up in an old oil bucket and ship it to me,, I"ll turn it right back..the new poppet valves are AR86535 ($52 each)if you need them....

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Tim S

08-14-2014 09:03:07

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 Re: 2840 SCVs in reply to Tim S, 08-14-2014 09:01:51  
You can cap the supply line and use the tractor..

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08-13-2014 15:57:26

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 Re: 2840 SCVs in reply to Bob Angus, 08-13-2014 13:13:01  
Assuming scv is not different on 2840....
I believe the return valves had only 1 oring and backup early on.
If you are referring to the sleeves the valves go into, the chamfered end goes onto the valves and the stepped end faces the cover.

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Bob Angus

08-13-2014 18:04:25

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 Re: 2840 SCVs in reply to D-, 08-13-2014 15:57:26  
Yes, according to my manual, the return valves have only 1 o ring and 1 backup. Of the 4 valve guides, I have 2 guides that are stepped with smaller diameter one end, 2 not stepped. I assume the stepped pair goes with either the pressure or return valves. The shop that did this "reseal" totally botched this. Unfortunately, I didn't take it apart, and took it there to save some time.

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