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Remote hydraulics questions (kinda long)

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Bud

02-11-2004 09:13:08

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I am building a fence post driver for my tractor. I am pretty green on hooking up the hydraulics. I have three cylinders. One to lift the driver weight, and two for lateral leveling (fore/aft and side/side) The tractor that I am using is a Case 1070 with two remotes. The levers inside the cab are spring loaded to return to a neutral position when not in use.
My questions are;
1. Can I bungee the cab lever to provide a source of hydraulic pressure to the driver which then has it's own control valves to operate the three cylinders?
2. I have seen commecial drivers work and the operator pulls a control valve lever which operates the lift cylinder mechanism and when the operator lets go of the control the cylinder "free falls" back to the retracted position. If I have the cab control bungeed open, will I still be able to do the same also?
3. I am confused as to the difference between double and single acting cylinders. I would assume I think that I need a single acting cylinder for the lift cylinder. What about the other two position cylinders?
4. I am also confused about what type of control valve to buy to allow me to operate the three cylinders off the tractor.
Yes I am totally green when it comes to hydraulics and if someone would be so kind as to perhaps draw me a schematic I would be well on my way to fence post driving nirvana! :) I will post pictures for the board when I am finished with the construction. Thanks in advance for any help and if someone needs to email me with details...nospamflyingvranch@earthlink.net
Thanks again folks!

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paul

02-12-2004 08:42:16

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Re: Remote hydraulics questions (kinda long) in reply to Bud, 02-11-2004 09:13:08

I'm pretty dense on hyds myself, but:

2: For this, I think you will need a large return line with no restrictions, for the oil to blow out as fast as it can. Not even a quick coupler, just a large return hose straight to the oil resovoir.

Also, it will cost more, but a pto pump & oil tank might be the way to go - allows you to match the oil flow to your needs, and not deal with the bungee cord & oil return issues?

--->Paul

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Brokenwrench

02-11-2004 16:48:15

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Re: Remote hydraulics questions (kinda long) in reply to Bud, 02-11-2004 09:13:08

You can tie the remote on the tractor to operate the hydraulics on the driver. You will need a 3 spool open center valve to operate the 3 functions,first section,for the driver a high flow valve section,so the piston will go up quickly,and drop the driver quickly,and 2 more valve sections,1 for the tilt and 1 for fore/aft. These should be low flow sections so you can make minute adjustments and not be jumpy. The cylinder for the driver should be a small diameter,heavy duty cylinder so the driver will move quickly.(you don't want to wait 3-5 seconds to raise the driver back up) Make sure the stroke on this cylinder is slightly longer than the stroke of the driver so you are not banging the piston against the ends of the cylinder on each stroke of the driver. The tilt cylinders can be small 1x12 tie rod cylinders, these don't take the abuse the hammer cylinder does. The valve bank can be made up of sections that are bolted together.These can be found at most good hydraulic supply houses. Explain to them what you want to do,and they can recommend which sections, what flow capacities,what size ports are required for your application.

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dave

02-11-2004 16:23:17

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Re: Remote hydraulics questions (kinda long) in reply to Bud, 02-11-2004 09:13:08

I have a shaver postpounder 3pt.mount It levels front to back and side to side with threaded rod/crank. Single action cylinder about 1 or 2" times about 4 ft long. I pull the lever to raise it , then push the lever to drop it, drop is spring assisted, and the return line, goes directly into the transmission resevoir , no fitting on the hose, and doesn't go thru the quick coupler.

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Thomas

02-11-2004 11:25:57

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Re: Remote hydraulics questions (kinda long) in reply to Bud, 02-11-2004 09:13:08

If you're going to run a feed like that you must make sure that the valve block you're using is big enough, otherwise the oil will overheat and damage the tractor. I'd think a CETOP 5 would be the minumum requirement. For 'free falling' you need a valve which has a float position on that service. Decide exactly how many services you require before spending any money as it's very difficult add extra spools 'in line' at a later date. For example, you might want some sort of hydraulic post holding clamp or hydraulic foot adjustment.

I've often thought about making a post rammer, I thought about using an electric solenoid block. This would allow you to site the hydraulic components neatly and have a control pendant (like you get on workshop cranes) to allow you to operate the machine from a convenient place (holding the post straight with a bar could be done by one person). You buy a base plate with the required number of services and then add suitable valves which could be of several different configurations. Try to find an agent for Denison Hydraulics, I've used their valves on several occasions and found them to be very good.

I once saw a post rammer which had been mounted onto a loader, looked good as it enabled access to tight corners and over ditches where a rear mounted unit wouldn't go.

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Bob

02-11-2004 09:54:08

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Re: Remote hydraulics questions (kinda long) in reply to Bud, 02-11-2004 09:13:08

Go to :

Link

In the "search" box, enter BOOK.

They have a number of hydraulic manuals, priced reasonably, and TONS of valves and cylinders, plus they have a "Technical Assistance" department that you can contact for help.

As far as tying a hydraulic valve in the activated postion, it is often done on farm tractors to power various attachements.

Operating the tractor for a long time with the valve tied in this manner may overheat the hydraulic oil on SOME machines. When you get set up, watch to see of the oil gets warmer than usual.

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