Hydraulic problems Power Trac 1850

[PowerT1850]

I will check how all is connected and come back. My pump, side of engine is for steering. I have no radiator for cooling, maybe it is an open circuit?

 

[PowerT1850]

Hi, I called Terry, and he could not help me to get a pump for my 1430. I got a circuit (open) for a similar newer from him, but it would be nice if someone could give me the right circuit ( late 80s) . I have an idea aboute the pump replacement. To use this: Surplus Center - PRINCE DOUBLE PUMP CW KEYED (CUSTOM) , and use a valve that direct from pumping around and gradually out in circuit with my hydraulic pedal. I have the frontward/backwards electrical. Must there be an expensive axial piston pump or is this cheaper solution with gear pump possible?

 

[J_J]

I think you would be better off getting something like this and adapting it to the engine if the coupling is not correct.

[Surplus Center - 2.30 cu in VARIABLE TANDEM PISTON HYD PUMP DANFOSS

since you only have a 15 GPM pump total capacity to work with, I selected these displacements if you are going with a gear pump

,Burden Surplus Center

Since the HP on the Kubota is about 30, you only have HP for about 15 GPM, and that includes all three pumps,

Drive/VSP

PTO

Steering and Lift

Did Terry happen to say what the displacement on the VSP pump was?

 

[SpringHollow]

JJ, that is a 50 GPM pump!

 

[J_J]

I know, I changed it to a smaller one, but even that is to big.

I tried to compute the displacement for the double gear pump and posted.

He has to stay with in the 15 GPM total at 3000 psi

I don't know if Terry is giving him his best shot, as the pump from the 1430 should be close, which has a 30 HP diesel.

Matching the splines to the Kubota engine might be difficult.

 

[PowerT1850]

No, Terry could not help me more. No documentation from that time. Does it work ok with gearpump and control like my suggestions? Is it some drawback with gearpump? My pump have 3/4 inch axel and with parallel key. Is 14-15 cu in with 150-300 rpm for wheel motors ok?

 

[J_J]

There are some things that are not correlating. The label on the engine says it is a V-1200, and the HP is about 30 HP.

You say you have a 14 cu in pump, but you don't have the HP to run that pump.

A 6.0 cu in pump turning at 2500 rpm would pump 65 GPM.

To pump 65 GPM's at 2500 psi would require about 111 HP.

A gear pump would pump the fluid, but controlling the flow to the motors might be a little difficulty.

You will need larger hoses, larger filters, large GPM type valve, large fittings,etc.

You will need flow control for hyd motor speed and a way to switch the flow.

I would ask Terry why you can not use a 1430 VSP pump.

If someone on the forum has a 1430, they might be able to tell you the cu in displacement.

Running all the pumps, you only have 30 HP.

Several manufacturers make the VSP pumps, Eaton, Sauer-Danfoss, Sunstrand.


This type valve will control the speed of the motors in one direction .

This is the type valve I have on my 1445 for the PTO.

http://www.surpluscenter.com/item.asp?item=9-064-50&catname=hydraulic

 

[PowerT1850]

I mean the wheel motors should have 14-15 cu inc. What is the size of wheel motors for a PT 1445 with 45 hp?
Questions for a 1430:
1. Pump for wheel motors, flow and pressure and rpm.

2. Wheel motors cu inc, rpm.

3. Pump for lift and tilt, flow, pressure and rpm.

 

[SpringHollow]

A local hydraulic shop might be able to identify and replace/repair the existing pump.

Ken

 

[PowerT1850]

I have tried, but with no id plate and ( in Sweden rare) /old Hydura pump with all the piston shoes in very ,very small pieces.Se earlier in this thread...