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Tractor Talk Discussion Forum

Any ideas? Another hydraulics question

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Brian in NY

12-06-2006 05:38:50




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On my plow tractor (Farmall H), just recently changed out the hydraulic oil (now running hytran). Now the hydraulics work great, but my single cylinder snow plow lift now lowers slower than molasses. It was slow before, now it's twice as slow. I figure since there is only one line for fluid going to the cylinder, and no return line, there is just nowhere for the fluid to go.
I would love to have the plow drop quickly.
How does one accomplish this? Keep in mind this old tractor has only a belly pump and one way hydraulics....and also keep in mind that any remedy is going to have to be cheap, because I just don't have a lot of extra cash on hand at the moment. Thanks!

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Bob

12-06-2006 15:40:28




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 Re: Any ideas? Another hydraulics question in reply to Brian in NY, 12-06-2006 05:38:50  
Some old machinery with one-way hydraulics uses one or two LARGE spings to aid in returning the cylinder. Any way you could do that with your setup?



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jromeo

12-06-2006 09:57:39




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 Re: Any ideas? Another hydraulics question in reply to Brian in NY, 12-06-2006 05:38:50  
How cold is it out there? My hunch is that the Hy-Tran tractor oil (being a petroleum-based product) is thickening in the cold weather. Did you look at a synthetic-based product like Amsoil's ATH Synthetic Tractor and transmission Oil? This oil is good down to -47F, and being a synthetic, the flow through the lines is much improved due to the small molecule size. It will last longer than the Hy Tran as a bonus.

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mowr

12-06-2006 09:53:49




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 Re: Any ideas? Another hydraulics question in reply to Brian in NY, 12-06-2006 05:38:50  
There may be a restrictor-type check-valve or some other type valve (adjustable or not) in the circuit or in the hydraulic valve assembly. The object, of course, is to keep it from crashing down and damaging something or someone(!) when lowering. If this is partially clogged or needs adjusting, it can cause this problem. Once when I had this problem I finally found a book for it and it showed how to adjust the drop-speed. On that one it was just a matter of turning a bolt-head on the valve assembly. Your pressure line, when lifting IS the return line when lowering and it shouldn't make any difference in the speed whether you have one line or two. If by disconnecting the hydraulic fitting from the cylinder, it can drop suddenly, then you have a restrictor, restriction or valve in the circuit. A restrictor plate could even be located in the inlet of the cylinder. Hopefully it will be something easy and inexpensive.

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jhill52

12-06-2006 07:07:28




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 Re: Any ideas? Another hydraulics question in reply to Brian in NY, 12-06-2006 05:38:50  
There should be a vent on the other side of the the cylinder. Is it plugged? You could add a spring across the cylinder to help the cylinder retract faster.

Jerry



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Billpa

12-06-2006 06:48:34




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 Re: Any ideas? Another hydraulics question in reply to Brian in NY, 12-06-2006 05:38:50  

did you check that the quick-coupler is working properly?



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Josh in Pa

12-06-2006 06:13:17




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 Re: Any ideas? Another hydraulics question in reply to Brian in NY, 12-06-2006 05:38:50  
Are you using 1/2" hose? Other than that I think it is just a matter of weight. Perhaps you could change the configuration of the cylinder so that more force is applied to it? For example on my loader there are two holes where the lift cylinder can attach. One is farther away and the loader will lift higher and faster, but has less capacity. The hole further back is slower but the cylinder has more "leverage" and can lift more. Maybe you could do something like this so the cylinder has less "leverage" and more force is applied to it so it returns faster.
Josh

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Triplerange

12-06-2006 06:09:17




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 Re: Any ideas? Another hydraulics question in reply to Brian in NY, 12-06-2006 05:38:50  
Only other way I know that will help is to shorten the hose to the cylinder or reduce the fittings. Also use 45 degree fittings instead of 90 degree. Probably won't help all that much. Probably help the most if you had a smaller diameter cylinder. Or mount the cylinder where more weight of the plow is exerted against the cylinder.



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old

12-06-2006 05:51:51




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 Re: Any ideas? Another hydraulics question in reply to Brian in NY, 12-06-2006 05:38:50  
The reason it drops slower now is that the Hy-tran is probably a thicker oil then what was in there. About the only way to get it to drop faster would be to add some weight to the plow since its gravity down. Your fluid goes in and out of the cylinder with the same line



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Brian in NY

12-06-2006 05:59:02




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 Re: Any ideas? Another hydraulics question in reply to old, 12-06-2006 05:51:51  
Oh yeah, I get that....just wondering if there is any way to rig it up differently to drop quickly.



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old

12-06-2006 06:24:47




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 Re: Any ideas? Another hydraulics question in reply to Brian in NY, 12-06-2006 05:59:02  
About the only way to get it to drop faster would be to plumb in another valve in the system, and that would cost you $100 plus for the valve nd the extra hoses



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Old Pokey

12-06-2006 05:56:25




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 I agree with old........ in reply to old, 12-06-2006 05:51:51  
Raising the plow you have a couple thousand psi oil doing the work. Lowering it you have none, just the weight of the plow.



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