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Questions

Building Hydraulic System

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Mike Marlow

07-30-2001 10:48:33




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I'm building my own 3pt hitch on a 1947 Alis Chalmers WC. I have the hitch components, a pump and am in the process of mounting things.

What I really need is a good quick tutorial on hydraulics. I'm under the impression that I can simply install a 1 gallon fuel tank and run it to the input side of the pump, then run a line back to my control. Do I also need to run a line back from the control to the tank to accomodate lowering a load?

Could anyone here refer me to a good web site that gives the necessary tutorial? I've searched but have found none.

Thanks,

-Mike-
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BlueLite

08-01-2001 21:22:32




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 Re: Questions - Building Hydraulic System in reply to Mike Marlow, 07-30-2001 10:48:33  
Good suggestions here. I did mine on a
MH30. Reservoir tank is up front in front of the rad and behind the grill. The tank cap is just in front of the rad cap and easily accessible. 1/4 of the tank is lower than the pump. If you install an air line for your oil reservoir tank, have the air come from a clean filtered source. Mine leads back into the block where there is a tapped hole just above the oilpan air space. MH always used a flared steel tube for the line from pump to cylinder as the pump gave approx 1600 lbs pressure. I could never really find out what it really was and I didn't have an original line so to be safe I installed a 4000lb
1/2in ID hydr. hose to the cylinder. Ensure both ends have a swivel connector to ensure the hose doesn't turn when a wrench is applied. Don't use teflon tape for the threads either. Use special thread compound. The outbound line is an oil resistant
neoprene of 1/2ID of 200lbs pressure and leads back to the tank, this is available at most auto
supply outlets. The MH cyclinder is a 2 way with a safety
valve built in. An old timer told me that the way
to check if the valve is working is to have the tractor cold. And when your system is all hooked up and leakproof start the tractor at a very low
idle. Apply the cylinder leaver and hold it there.
If the valve is working the tractor should almost
stall when the cylinder bottoms out but still keep running. If it isn't the pump will come to a dead stop and the engine will die. A word on your 3PH attachment. Viewed from the side, you want to get the 2 bottom arm pins in vertical alignment with your top pin attachment as close as possible. This will ensure that the 3PH attach points of your implements will always be in parallel with the tractor side pins when raising and lowering. Otherwise you will be forever adjusting your top link for the various implements to get it level.

M2C

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Mike Marlow

08-02-2001 03:03:30




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 Re: Re: Questions - Building Hydraulic System in reply to BlueLite, 08-01-2001 21:22:32  
Thanks - some really good information in this post. I am currently waiting on the local welding and fabrication shop to complete the parts to rotate and lift the lower arms, then I can get going and weld it on the tractor, and tackle the plumbing. Having a shaft with a universal joint fabricated also, since the only place I could mount the pump was ahead of the radiator grill, on the steering block. The shaft will connect to the crank shaft pulley. Once I get this done, I'll try to post some pics. Thanks again for the good input.

-Mike-
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Dan

07-30-2001 12:01:21




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 Re: Questions - Building Hydraulic System in reply to Mike Marlow, 07-30-2001 10:48:33  
Sounds like you have a pretty simple system. You need a line from the tank to the pump, preferably through a hydraulic filter. The pressure line fromt eh pump should go to your valve input side, then a line comes off the valve on the "return" side to the reservoir. If you have a 2 way syslincer on your 3 point and want to use it with power both ways, run a line from each of the other 2 ports on your valve to each end of the cylinder. If you ar ysinbg a 1 way cylinder just run one line to the end of the cylinder you need to push and put a breather plug in the other end. If the valve is 2 way you would need to plug the other outlet from the valve. This is assuming the valve has a pressure relieve valve built in which most do. That way when you are not using the cylinder but the pump its running oil flows from the tank through the pump through the valve and back to the tank. When you move the valve oil flows from the tank to the pump to the valve and out to the cylinder. When you let the cylinder down, oil flows from the cylinder through the valve back into the tank. In other words you have to have a circle. If you have a 2 way cylinder, pressure both ways, when oil flows out of one end it will return to the reservoir while oil is pushed into the other side of the cylinder. One side of the cylinder has a slightly smaller volume than the other due to the displacement of the cylinder shaft. If using a one way cylinder, when it is down the reservoir must be large enough to hold the oil from the cylinder as well as some reserve. hope this explains it ok, I don't know of an internet site on hydraulics but would think they are out there. You might also check archives on the other forums here for some info

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Mike Marlow

07-30-2001 12:40:40




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 Re: Re: Questions - Building Hydraulic System in reply to Dan, 07-30-2001 12:01:21  
Thanks Dan. Just another question - Is it necessary for the hydraulic reservoir to be higher than the pump, in order for gravity to feed the pump, or will there be enough suction created by the pump if the tank is a few inches lower than the pump? I'm guessing that I'd put it around 6" to 8" lower if that's not a problem.

-Mike-
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Dan

07-30-2001 21:00:44




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 Re: Re: Re: Questions - Building Hydraulic System in reply to Mike Marlow, 07-30-2001 12:40:40  
My JD has the reservoir lower than the hydraulic pump so I don't see why it wouldn't work if a little lower. If it is higher will probably be less apt to get air into system though. Be sure to use good hydraulic oil such as hytran, hygard or equivelent generic brand and keep it as clean as possible



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Fudd

07-30-2001 20:16:45




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 Re: Re: Re: Questions - Building Hydraulic System in reply to Mike Marlow, 07-30-2001 12:40:40  
Are you close to a store that sells hydraulic components? They usually have books that deal with basic hydraulic circutry. Call around to see what you can find. When dealing with pressure it's best to do it right.



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