Bent the Hoe Boom Cylinder

[Eagleview]

As the picture clearly shows , the rod was not fully extended , taking into account the paint line on the ram and the length of the tube . Nor is it possible that it could have been as you say the bucket was below grade by 4' . The boom could not have been fully up . Is it possible the ram came into contact with the spoils from the hole ? Did the ram bend up or down ?

 

[Wayne_Freeman]

I think the rod was fully extended when the damage occurred and would pull in a few inches.

 

[Eagleview]

That would mean the boom was at full height when the damage occured .

 

[Wayne_Freeman]

The boom cylinder was fully extended and the bucket was down in the hole. I had to take the cylinder loose at one end just to drag the bucket up to ground level because the bent cylinder would not retract.

 

[Eagleview]

You may have found your problem . It must be a very strange arrangement that would have the boom fully up , and the bucket 4' down a hole instead of being at least 2 feet in the air .

 

[Wayne_Freeman]

What I meant to say was when the boom cylinder is extended the boom is down. To raise the boom fully the boom cylinder is fully retracted

 

[john_bud]

You may have found your problem . It must be a very strange arrangement that would have the boom fully up , and the bucket 4' down a hole instead of being at least 2 feet in the air .

The BH boom cylinder is above the boom, not below it. It is designed to give higher digging forces at the expense of lower lift force.

My boom cylinder is like yours, UNDER the boom and is extended to raise. The small hoe's are the other way around to maximize dig with small cylinders. Obviously, they are engineered right to the edge.

jb

 

[Eagleview]

Ahh , i see it all , thank you . So any effort that would try and lift the rear of the machine would try and bend the ram . I do'nt understand why they would use the back side of the piston with it's lower capacity to do the heaviest task , lifting .
Please accept my apology Wayne , i was'nt aware the ram was on top .

On edit , i wonder why it would not work the same as other backhoes , the ram underneath should have enough downforce .

 

[Wayne_Freeman]

No problem. Thanks for your input!

 

[john_bud]

On edit , i wonder why it would not work the same as other backhoes , the ram underneath should have enough downforce .

In a word --> Marketing driven low cost engineering.


They use a smaller cylinder to get the cost down but use the "big end" to get the force numbers up to impress the buyers.


jb