It's time; either get started or....

NormL · Apr 30, 2021

I took a hard look under the tractor and I think it can be done. I have the shaft material and probably the pulleys too but if I opt for a 2" / 6" combination I can run the engine a bit faster and hopefully prevent the stalling that is happening now. So 5" on the tractor to a 6" turning a 2" on the same shaft that is belted to a 10" pulley on the pump. I might not have to clutch like I'm doing now but if starting is troublesome then I'll use the idler pulley as a clutch again. I would like to run the engine a bit faster than high idle so it has the power to run the hydraulics. I'm still going to go with the restrictors so I can control everything better. I'll start with 1/16 diameter openings and see how that works. It looks small to me but that's what I see on some fittings I have but are the wrong size. I can drill them bigger if need be.

Xfaxman · May 1, 2021

Sounds good, keep us posted.

NormL · May 17, 2021

Here it is over half past May and after a few Spring like days we've got summer! I slowed down the drive to the pump, maybe a bit too much as the boom has become sluggish. The dipper and bucket move ok but I have yet to try with a working load. I can't do that till the boom issue is resolved. The restrictors I made up may not be needed once I get the pump speed right but the belts are running into a bit of money each time I change pulley size. I'm also having to beef up some welds I forgot were only spotted on. The swing system also is in need of a redo and there is very little space to work. Sorry, no pix yet but I'll do a few soon. So, bit by bit things are getting done. I sure hope to be digging before Summer is officially here.

Xfaxman · May 17, 2021

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NormL · May 18, 2021

Bad news

. The pump which I salvaged from an old bale loader/stacker has barely enough pressure to move the dipper and bucket when the load is light. The load for the boom is never light and consequently it can't lift the weight of the dipper and bucket. Grrrr!! Plan A: I have another salvaged pump but I have doubts about its suitability on this machine. It came off a Toro mower which I think had all functions hydraulically driven. The pump appears to be "stacked" with pumps for various functions. I'm not sure which one to use and which ones to plumb to circulate a bit of oil through a manifold. Plan B: Take a deep breath and buy a new pump. If I go this route, how much pump do I really need here. All my cylinders are two inch and none of them should be moving at more than a moderate speed at any time. Thoughts?

NormL · May 18, 2021

I dug out the pump I mentioned in Plan A.
IMG 2722 and 2723 show the ports on opposite sides of the pump. All three shown in 2722 deliver a detectable push on a finger placed over the opening while turning the shaft clockwise. The ports on the opposite side are larger and I don't feel either push or pull by turning the shaft by hand. IMG 2728 offers information on the manufacturer. Can anyone offer instructions for plumbing this into the backhoe?

NormL · May 19, 2021

I have a thread going in the hydraulics forum and one of the TBN'ers cautioned me about my routing of the line to tank from the four-spool vale set into one of the tank ports of my secondary valves served by a power-beyond from the primary valves. This could block the flow from the primary valves, he warned me, and in retrospect considering the issue I'm having, he may well be right

. So, before I do anything rash and change out the pump, I'll follow up on this advice before I proceed.

Xfaxman · May 19, 2021

aczlan · May 20, 2021

NormL said:
I dug out the pump I mentioned in Plan A.
IMG 2722 and 2723 show the ports on opposite sides of the pump. All three shown in 2722 deliver a detectable push on a finger placed over the opening while turning the shaft clockwise. The ports on the opposite side are larger and I don't feel either push or pull by turning the shaft by hand. IMG 2728 offers information on the manufacturer. Can anyone offer instructions for plumbing this into the backhoe?

The two bigger ports are suction, the 3 ports are pressure out.
The big one will be high volume, the smaller ones are lower volume.
Might use one of the smaller ones for swing circuit, the other for the outriggers and the big one for the rest.

Definitely do not use the port on the valve marked as Tank for anything but a low pressure return to the tank.

Aaron Z