freefall on JD 410J

notretiredyet · Apr 5, 2023

I had an older JB that I used to put fence posts in. Upgraded to this 410J, nice machine but no freefall. Harder to put in posts.
Is there a way to disable the holdback so I can put posts in, then re-enable?
thanks John

Jim.ME · Apr 5, 2023

Someone may have a way, but I can't think of a practical way to have true free fall on either the loader or hoe of a 410J TLB. Pushing the loader lift valve into float is as near free fall as it would have, the hoe cylinders are all powered in both directions. Exactly what was the older machine you were using? Single or double acting hydraulics? Were you driving posts with the front bucket or the backhoe?

notretiredyet · Apr 6, 2023

The older machine was a JD 310C, I used the back bucket curled under to drop down on the posts.
Worked great!

Jim.ME · Apr 6, 2023

I would guess it is a difference in the valving of the two which allowed higher flow in relation to cylinder volume so the 310C lowered faster. I don't think the 310C had a free fall position, the cylinders were double acting.

WilBury · Apr 11, 2023

Some hoes have a valve to adjust for boom fall. Look for one in the boom circuit.

Jim.ME · Apr 12, 2023

Have you checked your operator's and technical manuals to see if they have info on such an adjustment WilBury mentioned? I would expect instructions on making such an adjustment to be in one of the manuals, if it has that option. You could ask your local JD Construction dealer service department staff.

WilBury · Apr 12, 2023

On my very old Warner & Swazey 110 backhoe attachment the valve is called a Flow Restrictor Valve and is plumbed between the main valve bank and the rod end of the boom cylinder. It can be adjusted by its single screw to regulate the speed of boom fall at the cost of hesitation when lowering the boom further. Handy for trying to hammer some rock or posts in your case but for regular use, return it to a setting that eliminates the hesitation. Pretty old invention but a good one so I'd expect there to be something similar on modern equipment unless maybe it's handled by a secondary relief valve on the main bank or some such. Mine is sized to handle a large fast flow so is likely a separate valve on yours too. Don't confuse it with the other relief valve that should be plumbed to the other end of the boom cylinder. The difference being there is no return-to-tank line on the valve you're looking for. If you find it, feel free to experiment, no special instructions needed.

This post was edited by WilBury on 04/12/2023 at 07:14 am.

Jim.ME · Apr 12, 2023

I doubt he has such a valve or adjustment point for the boom circuit but will be glad to learn about it if he does have one. I have seen adjustable flow controls on circuits for auxiliary attachments like hammers.

WilBury · Apr 12, 2023

It was such a nice feature, I'd be surprised if it isn't standard. Mind you, dents in yer bucket are a real consequence.

This post was edited by WilBury on 04/12/2023 at 07:31 am.

WilBury · Apr 12, 2023

Could this be your boom control valve? Maybe one of the optional relief valves?

https://spare.avspart.com/catalog/deere/1575/46550/389166/

If so, advice from a dealer would be helpful.

freefall on JD 410J

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