Wheel Loader Obsolete Pump Replacement

[Chansey]

My Trojan Loader 1500Z has been down for over a year and have given up trying to find an OEM replacement hydraulic pump. The unit is a 1989 Trojan 1500Z ser#3121509. Trojan ceased to exist in 1991. Minnpar and Deluxe can offer no help and don't have a solution for a replacement pump.

The pump is German and does not have a model number on the plate. Lists type as 14 176 95 ser# 806 J. It is a 3 section pump with a large pressure valve body mounted directly to the pump. The section outputs are 32-20-30 m/l Max pressure is 2500 PSI The shaft spline is 14 teeth



I had an issue with the hydraulic pump shaft seal leaking and overfilling the transmission. When I opened up the pump, the bearing was toast and only a small portion of the seal remained. Prior owner had attempted repairs and made a mess of it. Further inspection noted housing and gear wear as a result of the bearing failure. Was able to use the loader (barely) for another 6 months before the pump totally quit.

Now to my main question and request for help. I can put together a 3 section pump and meet the pressure and flow requirements, however the pump ports do not align with the pressure control manifold. The two functions I need are the lift arm/ bucket and pressure source for the power steering. The inlet for the center section has the port blocked off. Believe this is for a third function. The 1" port split flanges for the pump inlet hoses can be moved/relocated. There is not much room to move components around. The output connections on the pump are "o-ring" I need help identifying pressure control valves that can be mounted onto the pump without interference with each other.

Another option would be to relocate the pressure control valve and run hoses.

I am in no way schooled in hydraulics so bear with me on this. Have a lot of work for the loader and need to get it going.

Thanks .... Paul USMC Vietnam Vet

 

[mrmikey]

That looks like a Commercial pump.
It's either a code 61 or code 62 flange, probably a 62, you can check the dimensions on this page, SAE J518 Code 61 and Code 62 4-Bolt Flanges

So what you're saying is the valve straddles all three outlets and bolts directly to the pump outlet ports?...................Mike

 

[mrmikey]

Sorry, double posted, a Homer moment ......M

 

[Chansey]

Mike,

Correct, the valve body straddles all 3 outlet ports

Vickers no longer makes a GPC4-32-20-32-C7F4-R pump that would be a possible candidate.

Permco and Commercial discontinued their pumps as well or are not willing to work with me on this ?????

 

[ptsg]

I think I would get a new 3 section pump and separate the valve body from the pump by getting a thick aluminium plate machined and bolted to the valve body with the proper holes and fittings, then would simply connect the pumps to the valve body via a couple of hoses.

You mentioned the middle pump has the inlet covered with a plate, wouldn't this cause the pump to run dry and damaged the pump? Or is it fed from the other pumps?

 

[Chansey]

The center pump section has been a puzzle for me as well.

I wish I could get a circuit schematic to know how it all works.

If the center pump section is for a 3rd function, I could get by with a 2 section pump.

 

[oldnslo]

Chansey
What does the valve manifold connect to via hoses, tubes, etc? This might help provide some idea of what the valve does at what each pump section does.

I know on some older excavators there was a high speed option that combines the flow from two sections.

Also possible that the valve has a priority flow system for steering and possibly brakes. Balance of flow could be used for loader functions.

Being German it could be very specialized in design.

 

[mrmikey]

I think I would get a new 3 section pump and separate the valve body from the pump by getting a thick aluminium plate machined and bolted to the valve body with the proper holes and fittings, then would simply connect the pumps to the valve body via a couple of hoses

This may be an option but rather than hoses, offset the ports to match the pump to the valve, as long as the difference is not a major amount.

You mentioned the middle pump has the inlet covered with a plate, wouldn't this cause the pump to run dry and damaged the pump? Or is it fed from the other pumps?

Maybe use some oil to see if the inlet feeds two sections?

 

[Chansey]

The pump was installed back in the loader several months ago. I will remove the pump and see if I can determine how the pressure valves function as soon as I can get to it . It snowed two days ago and temps are near 10 deg F for a high.

Still would like to consider individual pressure reliefs for each port. Moving the pressure valve assy around on the pump is really not practical as pumps on the market places the ports much wider apart. The "o-rings" still have to seal to retain pressure.

A possibility would be to remotely place the pressure valve assy and run hoses from the pump to the "block" since I can use split clamps and "o-rings" on both ends.

It's gona be a $2,500 bill no matter what.

 

[SilentJ]

The pump was installed back in the loader several months ago. I will remove the pump and see if I can determine how the pressure valves function as soon as I can get to it . It snowed two days ago and temps are near 10 deg F for a high.

Still would like to consider individual pressure reliefs for each port. Moving the pressure valve assy around on the pump is really not practical as pumps on the market places the ports much wider apart. The "o-rings" still have to seal to retain pressure.

A possibility would be to remotely place the pressure valve assy and run hoses from the pump to the "block" since I can use split clamps and "o-rings" on both ends.

It's gona be a $2,500 bill no matter what.

Where are you located ? Just in general, like what state. I can recommend someone based on your location if you could take the pump to them ... measuring the internal components can help someone re create the original pump characteristics

Feel free to PM me