Takeuchi TB145 excavator - need new hydraulic pump

[Industrial Toys]

The displacement is not that much out, but it is a concern. Like putting a bigger blade on your dozer. It can push more, IF you have the power and traction. If you don't, you might have to alter your operating style.

My experience is bite the bullet and try and get the original. There always seem to be things totally unforseen to me that will mess me up.

 

[ptsg]

Looking at both tags and the identification plate on your pump, they both rotate the same way.

On the Rexroth plate, you can see the shaft with the arrow to the right. And on your pump the arrow is also to the right. Keep in mind, as some mentioned before, the rotation of a pump is always viewed from the front, on the input shaft side.

 

[ptsg]

Regarding the displacement difference, the new pump will put out about 1.8 GPM more than the stock one. Honestly, I don't think it'll make any difference at all.

 

[Industrial Toys]

And require that extra HP to do it. Nothing in hydraulics is free. If the op felt that he could have used a little more power before, going to a larger pump will make things a little worse. Smaller pump and he could operate at a few more Revs for the same result. But you can't run the larger pump slower because you don't have the HP. The OEM pump was probably chosen very carefully.

 

[ptsg]

It's a variable displacement piston pump. It will regulate the flow according to the load on the system. If there is load on the system, it will reduce the flow to keep the high pressure. If there is no load on the system, it will delivery all the flow. The OP won't notice any changes whatsoever on the engine. In the end, it's just a 3 cc difference, or 0.18 ci/rev. I really doubt that's even noticeable.

 

[Industrial Toys]

Sorry, I did not realize that is was a variable displacement pump.

 

[ptsg]

Sorry, I did not realize that is was a variable displacement pump.

No worries. On a gear pump, yes, it would definitely be noticeable and maybe cause some issues.

After doing some research, looks like it's actually two piston pumps and a gear pump. Or so they claim on the specs: "Pump Type Variable(P1+P2)+Gear(P3)"

 

[Industrial Toys]

When I was looking for a motor for my Cushman, I realized you could go crazy with all the Rexroth, Sunstrand variations and affiliations. Many of the OEM components were proprietary and the manufacturers would not discuss or devulge any information other than to their customer. One component was identical as a generic off the shelf one except the machine maker, Textron, supplied the seals to put in it, gave it their own part number and raised the price around ten times!

 

[oldnslo]

BLSTR88,
I did some more digging in my old, old files and found a limited amount of information on the Uchida pump that I am 90% confident is accurate.

AP2D = double open loop piston pump with gear pump
25 = 25 cc/rev per piston pump. Gear pump size not stated.
LV = Constant HP control
1 = design series
R = right hand (clockwise) rotation NOTE: My error in previous post stating that I believed these to be left hand rotation
S = spline shaft
7 = ? could not find this in my literature

NOTE: The Rexorth R971036692 nameplate in the picture shows a build date of 11W07 which 2011 week 7


I suspect but do not have any concrete proof that the Rexroth R971036692 is the replacement for the Uchida and would have the LV horse power control set correctly.

good luck in your search.

 

[Blstr88]

BLSTR88,
I did some more digging in my old, old files and found a limited amount of information on the Uchida pump that I am 90% confident is accurate.

AP2D = double open loop piston pump with gear pump
25 = 25 cc/rev per piston pump. Gear pump size not stated.
LV = Constant HP control
1 = design series
R = right hand (clockwise) rotation NOTE: My error in previous post stating that I believed these to be left hand rotation
S = spline shaft
7 = ? could not find this in my literature

NOTE: The Rexorth R971036692 nameplate in the picture shows a build date of 11W07 which 2011 week 7


I suspect but do not have any concrete proof that the Rexroth R971036692 is the replacement for the Uchida and would have the LV horse power control set correctly.

good luck in your search.

Wow thanks! Really appreciate all the info.

So if my current pump is a clockwise rotation I can be confident the new Rexroth pump is the same? Looks clockwise to me on the little drawing on the Rexroth tag...

If the Rexroth nameplate shows a build date of 2011 Week 7 then its likely a reman (or just take off/paint) unit? How likely is it that a brand new pump from 2011 has been sitting around uninstalled for 8 years?

Thanks for the info guys. Its sounding more and more like this pump from the Alibaba vendor might work for me, at less than 1/2 the cost of one sourced in the US.