Bent Cylinder Rod

[Believer]

Can a slightly bent rod be repaired? If so, what is the procedure? Thanks.

 

[AKKAMAAN]

Can a slightly bent rod be repaired? If so, what is the procedure? Thanks.

Please post a few pictures of the "mess"...

Usually the procedure will end up with a visit at the MACHINE SHOP, and have the to make a new rod....so best advice is to take the rod to the machine shop before putting more damage into the rod......

If I would DIY it....take the cylinder apart, disconnect piston from rod....

I would use some straight hard wood lumber for bracing, and a hydraulic press (or a sledge hammer) ....then roll it on my granite kitchen counter top (which is 100% flat or it would be cracked) to check it is straight...
I think there are experienced hydr-shop guys here that can fill in with details

 

[SpringHollow]

Maybe V-blocks in a hydraulic press would work.

Ken

 

[dfkrug]

Can a slightly bent rod be repaired? If so, what is the procedure?

I have done it 3 times myself, and have another JD cyl that needs
attention. (Those JD loaders use only 25mm rods!)

I just use my 20T press and check with a straight edge. Just don't
dent it or scratch it.

The last one I did, I posted here:
http://www.tractorbynet.com/forums/parts-repairs/146974-john-deere-4300-complete-rebuild-6.html

post #235

 

[SPYDERLK]

If on a loader, sometimes you can use the tractor hydraulics to straighten it w/o disassembly. A wooden v block to cause a pinch point as you articulate it.
larry

 

[MarkV]

If on a loader, sometimes you can use the tractor hydraulics to straighten it w/o disassembly. A wooden v block to cause a pinch point as you articulate it.
larry

Yep, worked for me one time on a backhoe cylinder.

MarkV

 

[wdchyd]

I know some of you guys have been lucky straightening them out w/o taking them apart, that's great....... but you do risk junking the barrel, gland and/or piston head......the safest way not to do anymore damage is to pull apart and straighten on hyd press.....use aluminum to protect chrome and a dial indicator for a visual so you don't overbend.......

Be carefull cuz some hardened rods do not want to be straight again.....

Don't ask me how I know!!!!!:ashamed:

 

[dfkrug]

......the safest way not to do anymore damage is to pull apart and straighten on hyd press.....use aluminum to protect chrome and a dial indicator for a visual so you don't overbend.......

I agree...take the cylinder apart first. You can rotate the rod in the
press to the best point (max bend) to place the force. It is not always
exactly perpendicular to the cross tube axis.

 

[Ford tractor]

Agree! Take the suckers apart. False economy to try with them together.

On the hydraulic press, you need to bend PAST straight slightly to get it to stay straight. The bend back pretty easy. If you take care with the seals, you may be able to put it back with them. (I never could, but you might)