990 3 way take off valve

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dbdgc
Posts: 10
Joined: Mon Jan 28, 2019 1:24 am
Location: New Zealand

990 3 way take off valve

Post by dbdgc » Tue Jan 29, 2019 12:24 am

Hi
I purchased a 990a a few weeks ago, I believe its a 1966 selectamatic, according to the serial number.

Any way it starts well and drives nicely but the hydraulics have given me a couple of issues.
So I have cleaned the lower filter and replaced the bypass filter and oil, cleaned the by-pass valve and hold valve.
After this service it improved dramaticly and lifts with good speed and power and holds well.

But the following day I found the loader wouldnt work and the links did, and after closing and opening the 3 way valve serval times the loader works, then close it and then the links dont. Then a few more opens and closes and they both work correctly then i change it and one would stop and so on...
Also the links will bounce (lift and drop about 50mm constantly.) sometimes and othertimes not.

To confirm when I Close the ram cylinder valve and Open valve 2 the loader would normally work. Close Valve 2 and Open the Ram Valve the Links would work. But the problem is that sometimes they just don't work.

So I'm thinking maybe the ram cylinder valve, in the take off valve, maybe be sticking or faulty and not opening and closing correctly to direct the oil to the correct area when selected. But I cant find any service or removal instructions in the workshop manual.

I would appreicate and feedback on other possible causes, before i remove it and any tips on removing it and servicing it please.


Thanks in advance

User avatar
ollek
Posts: 3971
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 990 3 way take off valve

Post by ollek » Tue Jan 29, 2019 8:31 am

If you have a 3-way valve with taps. please remember the following. You must have only one tap open and the other two closed. For example, If you want to use the 3-point hitch then you have to have the L-tap open and both the other taps (1 and 2) completely closed. The constant 50 mm lift and lowering (bounce) is most likely because the small hole in the hold valve centre is plugged with dirt.

dbdgc
Posts: 10
Joined: Mon Jan 28, 2019 1:24 am
Location: New Zealand

Re: 990 3 way take off valve

Post by dbdgc » Tue Jan 29, 2019 9:02 am

Thanks.
That's what I am doing, closing 2 and opening only 1.
The bounce seems to have stopped today.
I think the valve on the 3 way is sticking.
I got the loader working and left all the taps alone and it been good all day.


Then I shut the top valve and opened the ram valve and the links worked. Left it for while and shut the Ram valve and opened 2 and the loader stopped again. shut and reopend it several times and it works. So probaly stuck or dirt I Think.

Can I just pull the 3 way valve off and clean or is there someting important to be aware of?



Thanks

User avatar
ollek
Posts: 3971
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 990 3 way take off valve

Post by ollek » Tue Jan 29, 2019 11:39 am

The following is a link to the parts catalogue page ´for the 3-way valve https://partstore.caseih.com/us/parts-s ... 85ar351388

Gard
Posts: 287
Joined: Sun Apr 06, 2008 2:25 pm
Location: Fairfax Vermont USA

Re: 990 3 way take off valve

Post by Gard » Tue Jan 29, 2019 1:52 pm

Its been awhile but I think the 3 way valve is pretty simple. I had mine off and apart years ago. I ended up making some new knobs and threaded shafts. I used some cheep orings when assembling and had leaks, I purchased the correct part number parts from caseIH, and all is good now. I do not know if this is what is causing your lift problems or not.

dbdgc
Posts: 10
Joined: Mon Jan 28, 2019 1:24 am
Location: New Zealand

Re: 990 3 way take off valve

Post by dbdgc » Tue Feb 05, 2019 2:46 am

Hi

I took it off and checked it. The plungers are really stiff and hard to move, couldn't get them out.
So I have ordered a seal kit and will give it some surgery and hopefully fix it soon.

Cleaned the hold valve and by-pass valve again and the constant lift and lowering has gone, fixed for good I hope.


Thanks for the input and information

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