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fast hitch problem


 
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Danny Hogge
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PostPosted: Tue Oct 09, 2012 7:43 pm    Post subject: fast hitch problem Reply to specific post Reply with quote

I built a 3 point for my Super C and used an auxrilary valve and cylinder from a super c doner tractor with a 2 point.
Problem is I did not know about the small block in front of the seat on the Super c which is a 2 way check valve I am now told.
My lift will creep down but I can allow the stop plunger on the cylinder to be pushed in by the stop and it will not creep down.
Does any one know where I can purchase one of these valves or have a drawing of one so I can make one.
Please advise,
Tx,
Dan Sr.
 
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Dean Olson
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PostPosted: Tue Oct 09, 2012 7:59 pm    Post subject: Re: fast hitch problem Reply to specific post Reply with quote

Bypass it.

That block is designed to prevent a heavy implement from dropping too fast. Mine failed. I bypassed it meaning to get it repaired or replaced. That was 2 years ago.

It will work fine without it. Just pay attention to letting heavy implements down.
 
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IH fan
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PostPosted: Wed Oct 10, 2012 2:25 am    Post subject: Re: fast hitch problem Reply to specific post Reply with quote

There are companies that make "adjustable flow checks", Parker being just one. Flow free flows in reverse and meters in the other direction. Put the valve in the line from the head end of the cylinder, not the rod end. You want to meter the fluid returning from the cylinder, not the flow going in. If you try to meter the fluid going into the cylinder, when you initially move the valve handle to LOWER, there will be a sudden drop for a little way before it starts metering... just know that from experience of building test machines for a hydraulics manufacturer for several years.
Check out a Parker dealer near you... http://www.snap-titequickdisconnects.com/products/flow_control_valves/fria_series/index.html
 


Last edited by IH fan on Wed Oct 10, 2012 2:27 am; edited 1 time in total
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mkirsch
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PostPosted: Wed Oct 10, 2012 4:43 am    Post subject: Re: fast hitch problem Reply to specific post Reply with quote

The check valve is not your problem.

Your remote valve is leaking. It needs to be rebuilt.
 
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tractor vin
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PostPosted: Wed Oct 10, 2012 7:37 am    Post subject: Re: fast hitch problem Reply to specific post Reply with quote

or you could just plum in a ball vavle and regulate it your self
 
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IH fan
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PostPosted: Wed Oct 10, 2012 8:58 am    Post subject: Re: fast hitch problem Reply to specific post Reply with quote

mkirsch wrote:
(quoted from post at 07:43:43 10/10/12) The check valve is not your problem.

Your remote valve is leaking. It needs to be rebuilt.


That may be true, but without the flow check it will drop fast with a heavy load. Probably the heaviest thing we had on our SC Fast-Hitch was the 7' disk and I'm sure it would have dropped pretty fast without it. If all he's using on his 3 point is a back blade, he probably doesn't need it, but with a bush hog type mower or a disk, he'll think the bottom dropped out when it pitches him up on the steering wheel (well, maybe that's a slight exaggeration). I think he needs one, and the Parker valve is pressure regulated so it will flow approximately the same with or without a load.
 
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mazemeister
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PostPosted: Wed Oct 10, 2012 4:40 pm    Post subject: Re: fast hitch problem Reply to specific post Reply with quote

FYI it's a one-way check valve. prevents the hitch from settling, doesn't do anything on the raise circuit.
 
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Danny Hogge
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PostPosted: Thu Oct 11, 2012 7:57 pm    Post subject: Re: fast hitch problem Reply to specific post Reply with quote

At the risk of sounding like a not so smart person .
With a simple ball check in the pressure line, I understand that the implement will be prevented from creeping down .
Question is what happens to the oil on the bottom of the cylinder piston when the Implement is lowered ?
Won't that oil have to be returned when oil pressure is applied to the top side of the cylinder's piston as the implement is lowered?
Won't the ball check prevent this oil from returning to the resevor?

When I mentioned this problem (creeping down) to a retired and highly regarded Farmall mechanic .
He instantly ,without hesitation said that the 2 way check valve was at fault.Although I never heard of a 2 way CHECK valve
When I suggested that the auxrillary might be worn , his responce and I have to agree ,that a brand new valve could not be made at close enough tolerance to hold the oil and not allow the oil to pass by it and still be able to be shuttled by hand to direct the flow of oil in the desired direction.

So I don't have a clew does onyone have a suggestion.
And don't say buy a new tractor I like my old Farmalls and in this economy!!!!
Please advise,
Dan Sr.
 
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IH fan
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PostPosted: Fri Oct 12, 2012 1:09 am    Post subject: Re: fast hitch problem Reply to specific post Reply with quote

Yes, a simple check valve will not work because it would block the return flow when you wanted to lower it. There is such a thing as a pilot operated check (what we called them at Cessna/Eaton), maybe what your mechanic calls a 2 way check, where the valve will "check" the flow until the other side is presurized and then a small pilot line will "unseat" the check and allow flow backwards through the check valve. One of these will do what you want to do and this may be exactly what that block in front of the seat is, I'm not sure. A valve like I recommended earlier will not prevent "creep" with a heavy load, but would control how fast a heavy implement dropped when you move the valve lever to lower it. I thought that was the problem. If it's to prevent a creep down situation, then the pilot operated check is what you need. Then the only thing left that will let it creep down is a leaking cylinder. Often wish I could draw a hydraulic circuit and post it, it would help understand how these things work. Although I know how to draw hydraulic schematics (did this for a living for years), I wouldn't know how to post them.
 
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danny hogge
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PostPosted: Fri Oct 12, 2012 9:26 am    Post subject: Re: fast hitch problem Reply to specific post Reply with quote

Thank you .I think I can make what I need from what you have described.
Dan Sr.
 
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Faster346
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PostPosted: Tue Oct 16, 2012 10:41 am    Post subject: Re: fast hitch problem Reply to specific post Reply with quote

That piece cracked on my Super C and leaked fluid everywhere. I just went to Napa and bought two 1/4 NPT couplers (female on both ends) and just connected the lines together with those. Fast hitch works just as good as before. Just happened today actually.
 
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NoNewParts
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PostPosted: Tue Oct 16, 2012 4:55 pm    Post subject: Re: fast hitch problem Reply to specific post Reply with quote

I also believe the remote valve is leaking.
This statement:
Danny Hogge wrote:
(
My lift will creep down but I can allow the stop plunger on the cylinder to be pushed in by the stop and it will not creep down.
Tx,
Dan Sr.

sounds like your cylinder is ok

my setup bypasses the factory hydraulics completely.
(block off plate under the pipes with only a pump suction hole drilled)
just pump, to a open center remote, to the cylinder,
with the valves return plumbed to factory drain plug location.
no check valve under the seat, and no stop plug on the cylinder.
(it was missing, so I brazed a pipe plug in the hole.)
works fine, doesn't leak down
heavy loads, I just move the lever slowly down
 
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