Dipper Stick snapped in half

[JFS2295]

And as mentioned before, altering the relief pressure setpoint may be a good course of action.

 

[wedge40]

Eddie this has been in our news for a while now. Maybe you needs these guys to fix your dipper stick.

I-64 bridge crack has been mended | The Indianapolis Star | indystar.com.

Wedgge

 

[two_bit_score]

Yesterday, I was taking down a dead (almost dead) water elm tree beside a creek. (Sorry, no pictures. . . I know, I know...) Anyhow, my LB75B has fairly new teeth and I was ripping out feeder roots so I could just ease the tree over. I found some roots 4"-6" in diameter and they were stong enough that I popped the front wheels and loader bucket into the air with my backhoe. I didn't have the bucket loaded, but my 4wd front end is a bit heavier than a 2wd. Anyhow, I used the teeth to "chew" the roots a bit so they were weak enough to pop out of the ground. Because of Eddie's problems, I was very conscious of the shock loads to the BH and especially the pivot bearings right at the tractor. Once I got the tree pushed over, it had huge root ball filled with dirt. I used the bucket to clear out some of the dirt and then got the bright idea to hook my bucket over the root ball near the base of the tree trunk and bury the teeth. Then, I turned my seat, lifted the outriggers, and drove my tractor while towing the tree and rootball impaled on the BH bucket. It made the front wheels so light that I couldn't steer, so I used brake steering to hold my line.

Looking back, I suspect my dipper was under some tremendous stress to break just like Eddie's. I think "stunts" like that and slamming the bucket into hard soil are probably pretty hard on these machines. It's so easy to move a control stick that you just don't realize how much force is being applied by the hydraulics.

Right. This thread has made me rethink some of the same issues.

 

[LD1]

Looking back, I suspect my dipper was under some tremendous stress to break just like Eddie's. I think "stunts" like that and slamming the bucket into hard soil are probably pretty hard on these machines. It's so easy to move a control stick that you just don't realize how much force is being applied by the hydraulics.

Not to mention the EXTREME pressure the cylinder and hydraulic lines were under. You are lucky you didnt blow a hose. I just discussed this in another thread about pulling with something attached the the BH. IF the hydraulics wont move it under its own power, pulling with the tractor will put the hydraulics under MORE pressure than your pump can generate and NO relief valve either. The tractor has more power pulling that the hoe. So I advise NOT pulling from any point on the hoe. Rather hook to something ridgid on the tractor NOT connected to a hydraulic cylinder:thumbsup:

 

[RickB]

Not to mention the EXTREME pressure the cylinder and hydraulic lines were under. You are lucky you didnt blow a hose. I just discussed this in another thread about pulling with something attached the the BH. IF the hydraulics wont move it under its own power, pulling with the tractor will put the hydraulics under MORE pressure than your pump can generate and NO relief valve either. The tractor has more power pulling that the hoe. So I advise NOT pulling from any point on the hoe. Rather hook to something ridgid on the tractor NOT connected to a hydraulic cylinder:thumbsup:

Backhoe valves have circuit relief valves in key circuits to prevent damage from external forces on those protected circuits.

 

[jinman]

IF the hydraulics wont move it under its own power, pulling with the tractor will put the hydraulics under MORE pressure than your pump can generate and NO relief valve either.

The tractor moved the stump easily with the hydraulics, but only about 10' at a time and I had to reset the position and outriggers. I decided to leave the bucket sticking in the stump and drive the tractor instead. It worked well with the limitation that I had to use brake steering. Had the stump hit something firm while in motion, it could have been a different thing, but I was just dragging it through the sand.

I wouldn't recommend this with a compact tractor and backhoe, but with my full-size TLB, it worked well.

 

[LD1]

Backhoe valves have circuit relief valves in key circuits to prevent damage from external forces on those protected circuits.

Not ALL backhoes have that. So my point is just that it isnt good practice to pull with something chained or hooked to the hoe.

And even those BH's that have them reliefs, their is no guarentee that they will vent fast enough to prevent rupturing a hose. It all just depends on the geometry of the hoe, where the load is hooked, and how fast you are pulling.

I am not trying to be a "nag" or "saftey police" here. Just pointing out the real and present danger that some people may never give a thought about. And that is the fact that almost ALL BH's and trackhoes have the ability to pull MORE under wheel or track power than they do with the hydraulics.

Blown hoses are no fun for anyone

 

[RickB]

Not ALL backhoes have that. So my point is just that it isnt good practice to pull with something chained or hooked to the hoe.

Your point is well taken so far as it goes.
The backhoe in question IS protected by circuit reliefs, as is any full size or CUT sized backhoe I have experience with. I suppose there are exceptions, but they would be few. There are only a handful of valve manufacturers, and any backhoe builder would be pretty foolish to look far and wide for an off-the-shelf valve without circuit protection in order to place their fabricated booms and sticks at risk.

You are welcome to provide examples of valves to support your statement. Valves installed on Woods, New Holland, Bradco, Kubota, Arps, John Deere, CaseIH and Kelly machines and without doubt other major brands support mine.

 

[LD1]

Your point is well taken so far as it goes.
The backhoe in question IS protected by circuit reliefs, as is any full size or CUT sized backhoe I have experience with. I suppose there are exceptions, but they would be few. There are only a handful of valve manufacturers, and any backhoe builder would be pretty foolish to look far and wide for an off-the-shelf valve without circuit protection in order to place their fabricated booms and sticks at risk.

You are welcome to provide examples of valves to support your statement. Valves installed on Woods, New Holland, Bradco, Kubota, Arps, John Deere, CaseIH and Kelly machines and without doubt other major brands support mine.

I am talking more of the older backhoes. 1960's:thumbsup:

 

[RickB]

I am talking more of the older backhoes. 1960's:thumbsup:

Well there certainly was a point where a couple engineers scratched their heads and said "Holy crap! We need some kind of protection here!" and developed circuit relief valves.