Importing and modifying a new mini excavator from China

[dfkrug]

So, has anyone upgrade their Pump yet? I figure there is room for more flow.

18L/m @ 2300 PSI only requires around 4.7hp, where a 23L/m pump from say a 1600 machine is only 6hp. And it shows with the likes of a Diggit 15, still running the same 13.5hp B&S

An upgrade to the pump would be to lower flow unit, not higher. This would make the machine less jerky, as I discussed above. The boom, dipper, bucket, and house all move plenty fast now.

I do not know the size of the pump in the Diggit, but it looks larger than the 6.8cc units found in most of the 1-ton minis. Some of the flow goes to the servos, however.

With a 6.8 cc pump, the gasoline engine, running at 3000RPM, will put out about 5.4 GPM. Below 3000RPM, the engine will bog as it does not make much power at lower revs.

If you think you have plenty of power, then crank up the RV pressure to 2600 or more psi.

 

[D'oh]

Thanks, it wasn't power as much as Travel Speed, and Multi Operations at 1 time. And of course, Flow would help Cooling some.

HP is at 3000 rpm but Torque is already decreasing at 2400 rpm.

 

[Fredrik]

So, has anyone upgrade their Pump yet? I figure there is room for more flow.

D'oh, if you find one that will swap out with the briggs coupling I'll try it. Be nice to slow the jerkyness down. Burdans Surpluss may have one I"ll look.
You'll need to replace all motor and valve hose fittings to ones that have larger id constrictors. You might get better travel speed.

 

[dfkrug]

D'oh, if you find one that will swap out with the briggs coupling I'll try it. Be nice to slow the jerkyness down. Burdans Surpluss may have one I"ll look.
You'll need to replace all motor and valve hose fittings to ones that have larger id constrictors. You might get better travel speed.

How are you going to slow the jerkiness down with a higher flow rate pump and an engine that bogs below 2500 RPM?

Have you determined what the volume of your pump currently is, either by reading the label or opening it up and measuring?

Have you determined that there are existing flow restrictors in any of the work-port circuits? Remember that flow restrictors may slow things down, but they also add heat.

 

[D'oh]

How are you going to slow the jerkiness down with a higher flow rate pump and an engine that bogs below 2500 RPM?

Have you determined what the volume of your pump currently is, either by reading the label or opening it up and measuring?

Have you determined that there are existing flow restrictors in any of the work-port circuits? Remember that flow restrictors may slow things down, but they also add heat.

Yes, good point about the "Heat" but they would also help with Prioritizing a Circuit/Route. So they may have Multi Rolls.

All I am pondering is a 1.0T unit has 18L/m pump while a 1.5T unit might have a 22L/m pump. Same 13.5hp B&S XR engine transplanted into it, Same or very similar Hydraulic Cylinders, Valve Bank, Travel Motors and so on.

I think the Power is there, the Jerkiness might be increased, but would there be enough benefits?

 

[D'oh]

Anyone measure the size of the Grease Nipple of the Main Boom Pin. Again, spaz move, thought it was the same size as the Cylinder Fittings, easy out to take it out, tossed it and then found out it wasn't the same size, it is bigger threads.

 

[Rich B1]

Seems I “acquired” an AGT mini yesterday at an auction. Let the fun begin

 

[MattB4]

Perhaps someone can tell me if this is normal. On the operation of my Typhon mini I have noticed that it puts a heavier load on the hydraulics and engine when pushing the boom downwards, more so than any other hydraulic action. It is almost like it is held back from dropping. Is there a valve check and is it adjustable?

Thanks for any comments.

 

[dfkrug]

On the operation of my Typhon mini I have noticed that it puts a heavier load on the hydraulics and engine when pushing the boom downwards, more so than any other hydraulic action.

I have detected no constriction orifice fittings on any circuit of my Rhino (Xiniu) mini. However, that does not mean that no maker has installed them.

I do find that the work circuit for my AUX feature does have more restriction to flow than the others. I run a hydraulic thumb with fairly small diameter hoses. The Oking units had a larger hose fitting for the AUX.

A restrictor in the boom down circuit may reduce jerkiness a bit, but check to see if you have one. You will have to open the console to access the stack valve, which you will have to do anyway if you want to change the control pattern.

 

[Fredrik]

How are you going to slow the jerkiness down with a higher flow rate pump and an engine that bogs below 2500 RPM?

dfkrug, you are correct . Pardon my brain fart.
If one wanted to slow down the jerkiness you would go from a 4.75 gpm pump to something like a 3.25 gpm at 2500 RPM.