Backhoe Jinma LW-6

[TheSheriff]

I don't know the answer to your problem, but I was considering your BH when I bought my 284. During my research, I recall reading a thread much like this one. The "Experts" in that thread determined the poster was supplied the wrong pump with the BH.

Here's an example of a PTO pump if that helps.

https://affordabletractorsalesco.co...d=&PHPSESSID=2f33eaf8638216e9c977f3234ec353b9

Brad

 

[Rich Waugh]

Trelli,

As I understand it, there are two options for supplying hydraulic pressure to the backhoe. First is a pump that attaches to the PTO output shaft (the 6-splined one for implements). That type of pump is usually physically larger than the hydraulic pump that handles the your TPH, loader, etc, since it has internal gearing to get up to speed from the 540 PTO rpm. The other method of supplying power to the hoe is by using a hydraulic pump that looks pretty much like your regular CBN-type pump, but it is mounted directly to the rear of the lift box just above the PTO output shaft. There is a cover there with 4 bolts that you remove and install the pump in its place. The pump has a tang that engages a slotted shaft inside the lift box. That shaft turns at engine rpm so the pump delivers full pressure.

From what you've said, it sounds like you're using a pump designed for direct drive on the low-rpm PTO shaft. That ain't gonna work.

Hope this clears things up.

Rich

 

[TheSheriff]

And though it's not relevant to this thread, the third option is to use your existing engine mounted hyd pump... which works for me.

Brad

 

[RonMar]

Thanks Ron for the reply but I must admit that I'm getting confused, the pump that was supplied with the backhoe simply fits onto the PTO shaft at the back of the tractor, The four bolts and that bracket is simply to stop it from moving and twsiting with the PTO shaft. This shaft that I connect the backhoe's pump to is not ahead of the gear box becasue I can disengage it and change its speed from 540/750. It's the same shaft that I connect every thing to - flail mower slasher etc. There isn't two shafts , just the single one at the back of the tractor. Am I missing something?

I was under the understanding that the PTO shaft will acheive the speeds of 540 or 750 at a given RPM, I just checked my manual and it's 2200rpm on the JM354.

So that means that the pump from the backhoe that fits on the PTO shaft is supposed to be spinning at 2000rpm to acheive 16mpa, which means that currently It's jsut not spinning fast enough becasue at most I am giving it 750+rpm.

sorry for my ignorance if I am missing something.

The pump in this pic that YOU posted slips over the splined PTO shaft?
http://www.tractorbynet.com/forums/.../166116d1274425886-jinma-lw-6-back-loader.jpg

 

[Red55]

The pump in this pic that YOU posted slips over the splined PTO shaft?
http://www.tractorbynet.com/forums/.../166116d1274425886-jinma-lw-6-back-loader.jpg

Sure looks like the one I have mount to the shaft behind the plate. Not all tractors are shipped with the tabbed shaft for the direct mount pump

 

[trelli]

I think you guys have solved it for me. I took off the four bolts of the cover above the pto shaft and saw a splined female shaft with many splines. I then rand the PTO and noticed that it spun faster than the lower PTO shaft. This must be what you guys are talking about, that the pump should have been connected to this all along. However i've been trying to get it going with the lower PTo shaft because when it was sent from the factory the pump was mounted onto a bracket that slotted over the bottom shaft. I jsut assumed that that was the correct match. The company I got the backhoe off was not Jinma but another mob that makes loaders, the also modify backhoes etc. So really, it was the factory's mistake to even make that bracket that fitted over the lower PTO shaft and matching it with an incorrect pump.

I'll now be fabricating something to fit over that tang on that upper shaft and modifying the pump shaft to fit.

I'll keep you all posted.

thanks so much for the help.

 

[erj]

I'll now be fabricating something to fit over that tang on that upper shaft and modifying the pump shaft to fit.

Does this mean that the pump that you showed back in post 20 does not simply bolt onto the spot where you removed the plate?
RonJ

 

[Nuno]

If i understand it right, you have a Pump without Gearbox and with a Shaft that doesn't fit to the Shaft behind the Plate above the 6 splined PTO Shaft.

maybe it will help if you show some pictures of the Pump Shaft and the Shaft inside the Transmission Box.

My BH have an PTO Pump like this one

with an heavy weight cast iron Gearbox.

The Pump have an tang style drive shaft so that i can remove it from the Gearbox and install it to the Backside of the Tractor when i remove the plate above the PTO Shaft.
Your Pump Shaft must look like the right one in the following picture


if not, than i am sure they have send you the wrong Pump but if yes, they must fit without any modifications.

i am not sure but i think, the LW Series have an PTO Pump with Gearbox and the Pump without Gearbox that must be mounted fix to the Tractor is only for the Framemounted HW-03 Series Bachkoe.

 

[Nuno]

Just got a few photos here, it's been raining so I had tarps over them. There are a few items on that I cannot identify or recognise.Any help is greatly appreciated. The manual does not identify these.

thanks

ok,
the BH Valve is similar or maybe the same as mine and if i am not wrong the two extra RVs are for the Swing Cylinders but maybe the plumbing is not correct.
I have these 2 extra RVs also but not at the same place.

This is the Spool for the Dipper and i have caused by the RVs a minimal Breakforce when i pull the Dipper in.
The Plumbing is incorrect and different then showed in the Manual and the BH self.

 

[trelli]

here are some pics of the pump. It's definitely the wrong thype of pump to fit on the 6 splined PTO shaft.