Backhoe bh75 dipper rod bent

bigballer · Mar 26, 2012

the dipper rod on my bh75 was damaged (bent) and i am wondering if i need to have some special tools to replace it? has anyone done this or is it best to take it to a shop to have them swap the rod out? could the bent rod cause damage to any of the internal parts on the piston, cylinder, or seals?

you get bonus points if you can guess correctly how it was damaged. the hoe was not digging when this happend, in fact the tractor was not even running.

wdchyd · Mar 26, 2012

Lemme guess.....Someone back into it??

If the rod gets sucked in, it could do more damage to the gland, piston head or barrel

look and see if the gland is cracked from the outside...... with the rod extended all the way out off the machine, see if the rod is sloppy in the gland, you shouldn't see any slop

Best to take apart to determine if it just a routine rod/seal change or more...

Deano · Mar 27, 2012

Don't hook the backhoe to something, ie. root, and try to drive the tractor to pull it. A friend of mine did that and bent his piston on the dipperstick.

Deano

Baby Grand · Mar 27, 2012

Sorry to hear about the dipper rod. Did you ding a tree limb while trailering?

radioman · Mar 27, 2012

technically, you don't need special tools. it depends on the shape on inside. If you are not sure, I'd remove it from your BH with standard wrenches and take whole thing to hydrualic shop and ask for opinion. As long you didn't try to retract it, I would just leave as it till its looked at. some cylinders need spanner groove wrench or pin type wrenches or its welded shut.

Chances are a shop will prefer to replace rod, they could try to put it in a press and straighten, but they will tell you it can leak and no gaurantees.

Why not post a picture of it before taking it off? make sure you post pics of ends too.

bigballer · Apr 5, 2012

here are some pics it does not look as bad as i think it is..

wdchyd · Apr 5, 2012

This would be a good case for straightening.......if you decide to do it, a shop press with thick alum sheet metal chunks will protect the chrome from damage and a dial indicator helps to see when you get it close to straight

A seal kit and you're off on your way.....

CHDinCT · Apr 6, 2012

So do we have a winner yet on how it got bent? Curious to know so I don't make the same mistake. And I hope you can have a hydraulic or machine shop straighten it out for you. Looks to me that it can be bent back into position.

Herkypilot · Apr 6, 2012

Deano said:
Don't hook the backhoe to something, ie. root, and try to drive the tractor to pull it. A friend of mine did that and bent his piston on the dipperstick.

Deano

Yup! Brother in law did this very thing also. Same result and very obviously bent. He had a B75 or B77 BH, not sure which. About a $2k mistake as I recall. He let the dealership fix it. Ouch!:ashamed:

bigballer · Apr 6, 2012

it's about $450 for the rod and seal kit + 30 minutes of shop time. if i decide to buy a complete new cylinder it's around $600. i think i'll try to have the local shop put in in a press and see if they can straighten it. it is not leaking currently and the outer ring looks OK.

wdchyd was correct on how it got bent, someone (not me) backed into it and let me tell you if anyone actually tried to do this would not be successful. i know how it happened but still don't beleive it. the receiver hitch on the truck entered right between the dipper arm and the rod and the ball wedged between the two. they tried to pull the truck out but it would move the entire tractor. anyway a call was placed and i rushed home to assess. i had to start up the tractor and fanagle the hoe around for it to let loose as it was in such a perfect angle it did not want to let go of the ball.