Backhoe 4400 tractor with backhoe

[jfakerj]

MJB

With my 47 bh on my 4300 I also only run around 1800 rpms when using the bh. It can still be a little tricky at times. If the flow rate only controles the speed as you say, I wonder if there's any way to reduce the flow rate so the engine can be run at higher rpms there by increasing the hyd pressure and at the same time slow down the boom which in my opinion is way too fast. I really don't know if I need any more pressure though as I can move the whole machine now when bh ing.

Jerry

 

[MJB]

The hydraulic pressure is constant across the RPM range. The hoe has just as much digging force at 1500 RPMs as it does at 2500 RPMs. I know what you mean about the speed of the boom swing. Perhaps the 47 hoe moves faster than the 48 but I found that with some practice I could feather the controls enough to get a nice smooth motion on all the movements of the hoe. Practice is fun./w3tcompact/icons/laugh.gif If you wanted to just slow down the swing motion of the hoe without affecting the other motions you could probably install some in-line orifices to restrict the flow to the swing cylinders. If the other hoe motions are not too slow for you, I would try running at a lower engine speed to slow down the boom swing. Slow and smooth motion is also alot easier on the tractor and hoe. Hope this helps.

72% of all statistics are made up./w3tcompact/icons/smile.gif

 

[keeney]

Based on a couple of posts wishing the side-to-side swing was slower and some others wishing it was more powerful, it sounds like JD should think about changing the bore of the cylinders used. Going to a larger bore cylinder would accomplish both. It would take more fluid to fill the cylinder, so it would move slower, and the larger cross section would produce more force.

Is there enough room to retrofit a larger diameter cylinder?

Of course there are other considerations to worry about such as if the boom is strong enough to handle the higher forces, if the tractor is heavy enough to be stable with higher side-forces, etc.

- Rick

 

[MJB]

Looking at my 48 hoe I don't believe that there is enough room for larger diameter cylinders without doing some major cutting and welding to relocate the mounting plates for the fixed end of the cylinders. I have not felt the need for increased force in the side swing on my hoe. I would worry about tweaking the boom if the swing force was increased by much. I once overheard an old excavator operator instructing a new trainee to never hit anything or try to push anything using the side swing of the machine. He claimed that it was fairly easy to torque the boom of the excavator. He also said that an excavator with a bent boom would never dig quite right again. Old wives tale? Maybe. But I don't use the side swing to backfill with my hoe just in case. I find it is faster to turn the machine around and use the FEL for backfilling anyway.

72% of all statistics are made up./w3tcompact/icons/smile.gif

 

[jfakerj]

MJB
I haven't looked at any specs on this but I know on my machine there is a lot more digging force at higher rpms so this would indicate to me that the hyd pressure is not constant across the rpm range. I've had to up the rpms at times to dig though a root or something that it wouldn't do at lower rpms. I don't run it at the higher rpms any donger than I have to because of the very veryyyyyyyyyyyyy fast swing at those higher rpms. Also I've done quite a bit of digging with the bh and I've found that I can usually controle the boom it's just hard to feather. Some times I hit the swing a little too hard and the boom really takes off and then bounces back and forth when I stop the swing. This can't be good for it. Just wish the swing was a little slower is all. The rest of controles are fine. I have at times moved the tractor all over the place while digging in a hurry so there's plenty of power. I'm wondering if there's some sort of reducer (washer or something) that can be put in at the controle valve to reduce the flow of the swing only thereby reducing the speed. That should still leave the same pressure which is ok (don't know what I'd use more power for) on the swing.

Jerry

 

[MJB]

That seems strange. I am pretty sure I read in the hoe operators manual that the engine RPMs only affect speed and not digging power. I have never run my 48 at more that 1600-1700 RPMs so I can't say for sure if mine works the same way or not. The orifices that I mentioned earlier are what you need to install in the lines to the swing cylinders in order to slow them down. Your friendly Deere dealer should be able to set you up with what you need.

72% of all statistics are made up./w3tcompact/icons/smile.gif

 

[jfakerj]

MJB
Are you saying that deere has these orfices and they would actually know what I'm talking about. Do you know of any one who has had this done. I can live with this as it is but it would be much easier on the machine if it were a little slower.

Jerry

 

[DFB]

Jerry, there are in-line flow restrictor valves available in several different sizes.

The CT Farm and Country catalog has this description of 'em. " One way restrictor valve provides a fast flow in one direction and restricted flow in the other. Ideal for feather touch control of stroke" $14.99.

You can also see them online at Baileynet.com Look under Fluid Power/ Hydraulic Accessories/ Restrictors.

Hope it helps.

DFB

 

[jfakerj]

DFB
I looked at the flow restrictors you're talking about but have some questions about them.
1. It says therei is full flow in one direction and reduces flow on return. Does that mean I'd put one one each side and which way.
2. Where would I put them on.
3. I have no idea what size I'd need. Looked in my cheezy bh opperators manual and there no reference to anything like this.
I guess I'll have to call the dealer and ask them. Thanks for the info.

Jerry

 

[Keoke]

I have a Bradco 408 hoe on my JD 970 and it has a valve that controls swing speed. Maybe that valve could be plumbed into the JD hoes.

george