Altering an off the shelf pump unit.

[JimDawson]

If you're dumping 2600 PSI across a relief valve continuously with a closed center valve, things are going to get hot in a hurry. But if you have an open center valve so it's not building pressure except when needed, then little power is being used and little heat is generated.

In other words, the pump needs to be unloaded when not actually doing work. If you have all of the original valving in the grinder, then just connect the pump, without the attached valving, to the original system.

On the other hand, for a surface grinder, I would go with an all electric system. That's what I'm going to do with mine, I really hate hydraulics.

 

[Superburban]

Why not make something using a power steering pump. They are cheap, can put out 2 to 3 GPM, And can easily be driven by any electric motor, and can easily adjust the speed to get lower specs if needed.

 

[sdelivery]

I saw something at HGR for about that money that would allow continuous use.

 

[fixit]

Check surpluscenter,com they have lots of hydraulic parts

 

[Razzle]

Here are some pics of the hydraulics on the grinder. There are three lines, which is one more than I thought it should have. Haven't disassembled it enough to determine where each one goes. So I am assuming that this grinder has auto crossfeed as well as travel.

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[sdelivery]

Two pressure one return.
Power cross and table, lines should go to the control lever(s)

 

[sdelivery]

Let's see detailed pictures of the reservoir and piping as well

 

[Weldingrod1]

So, there's a few possibilities. The simple one is that the table cylinder gets full flow rate both ways. If it's a double rod cylinder then both ways are the same speed. Single rod = a lot faster retract than extend. Very low load on the hydraulic pump and low operating pressure. Varying the hydraulic pump displacement changes the speed.

Next up is a flow regulator for each direction. More pressure needed to operate the regulator.

Further up is a constant pressure system with flow control hardware. Higher power on fixed displacement pumps, lower power on variable ones.

We really need to know more to help you!

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[John_Dennis]

Hydraulic systems typically have very little pressure on the return side so ordinary heat exchangers like an automotive heater core could be used to cool the oil. You will want to start with a system that is as close to the right size as possible because slippage and pressure regulators may generate some heat. Hydraulic oil becomes abrasive when scorched so watch the temperature until you have everything well tested.