frozen backhoe pins

[meinnovations]

Hi, the saga continues with my L3240. I need to remove the backhoe to get to the rear transmission seal, but there's so much corrosion the pins are frozen. I've managed to free the pins' retention pins to try to rotate the pins themselves, but the pins aren't not budging. I've sprayed Liquid Wrench into all pin crevices and let sit overnight twice but I am unable to hit the pins squarely to drive them out with the rear wheels on. I've done my best to unload the pins with light upward pressure on the outriggers and the bucket, but I don't know of any tricks to determine when they're unweighted. My next step will be to remove the wheels so I can bang on the pins with a sledge. Failing that, I'll take out the torch and then bang some more. Any other tricks to unweight and free up those pins, preferably without removing the wheels?

 

[mikester]

Avoid the torch, get yourself a kit like this and press out the pins with a compact jack

 

[jaxs]

Keep putting oil on them. It's difficult to wiggle, tap on,drive,twist or otherwise attempt to move pins and remove tension at same time when working alone. I've had some success by cobbling up and clamping spring tension on pins while I pry and move arms looking for spot where pins aren't binding.

 

[William1]

WD40 is the wrong stuff. Kroll, PB Blaster or parafin with diesel. Soak, tap. Patience.
When mine are stuck, I try to twist and at the same time work the bucket up and down to find the 'sweet spot'.

 

[Tughill Tom]

Acetone and Type "F" trans fluid and soak it.

 

[GreensvilleJay]

yes 50/50 of ACE + ATF, best choice' decades ago guy did a good controlled study on off the shelf and homemade 'oils' and ACE+ATF was the winner in both application and cost.

I usually gently heat the 'where it has to go end' to help getting the oil to migrate that way. heat end, apply oil, wait a bit repeat several times.

Also, if possible, try( gently ) to rotate the pins,a little, back and forth,more oil, more back and forth. A possible problem is the pins may have become 'egg shaped' ove rthe years of bang,bang,bang ?

 

[Speed25]

I'll use a long-handle pry bar on the retention pins for leverage. I don't put enough pressure on them that they'd bend, but enough that they'll move when I hit the sweet spot. Sometimes I'll need a 1x4 or 2x4 wedged in somewhere for leverage and to not scratch the purdy orange.

 

[Oleracer]

All above good ideas. Dont be afraid to weld a big nut on pins so you can work pins back and forth twisting after heating.Done lots of pins PBlaster is in the service truck. Before welding nuts ream the threads out to get more surface area for welds and remove plating. Good luck.
BFH also

 

[notforhire]

Can you fit a wheel puller outboard to push the pin?

 

[chim]

I've used an air chisel a few times with a pointed bit. Helps to have a dimple in the end of the pin to help keep the bit centered. If there's no dimple and the pin isn't too hard you can drill your own.

 

[GBJeffOH]

Hi, the saga continues with my L3240. I need to remove the backhoe to get to the rear transmission seal, but there's so much corrosion the pins are frozen. I've managed to free the pins' retention pins to try to rotate the pins themselves, but the pins aren't not budging. I've sprayed Liquid Wrench into all pin crevices and let sit overnight twice but I am unable to hit the pins squarely to drive them out with the rear wheels on. I've done my best to unload the pins with light upward pressure on the outriggers and the bucket, but I don't know of any tricks to determine when they're unweighted. My next step will be to remove the wheels so I can bang on the pins with a sledge. Failing that, I'll take out the torch and then bang some more. Any other tricks to unweight and free up those pins, preferably without removing the wheels? View attachment 151837

Put grease fittings on the yellow part. Then force PB Blaster or something in with a Grease Buster.

https://www.amazon.com/Original-Grease-penetrating-hydraulic-pressure/dp/B01CYMY7ZA/ref=sr_1_1_sspa?dib=eyJ2IjoiMSJ9.g4znohW4J5EKakYyZovmdOcw47vUOMktIVqD9YRH7dZUutge8TXSmHUMh-XJK6WeS-8UL--uRXlF4L0sStK2iu2eI9KWStUQPQvEv0p_kbKksBz01pzvbJES4j6Ro_XVUh8HAKlKxdGMuN-AZy3jBFKG1s_MhOWDau53xMomHmEq4Hq8kFRF77H-gfobujb9tPobwqtAqezUJY3DgZQUeQvQhyqShPOtk9cdLSEm3mAjD52rUgK4dOunX1jgyDZxN546o-M-P4ytg255_UXrC-VRqHLpPW4msYc736kyFSk.Z0cP1OcCoQND67YMYEmWRED3A40qYnn7hLDufYsL6kg&dib_tag=se&hvadid=711490765884&hvdev=c&hvexpln=67&hvlocphy=9015267&hvnetw=g&hvocijid=13050540220555608375--&hvqmt=e&hvrand=13050540220555608375&hvtargid=kwd-2363201974508&hydadcr=20438_13507855&keywords=hydraulic+grease+zerk+buster&mcid=08497018528737108426b234de56ec4c&qid=1743868201&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1

 

[meinnovations]

View attachment 151844
Avoid the torch, get yourself a kit like this and press out the pins with a compact jack

Is this a Kubota tool? name and part #? other tool?

 

[RCW]

Is this a Kubota tool? name and part #? other tool?

The generic term is port-a-power. Not a Kubota thing.

 

[whatsupdoc]

I have removed some large stuck cylinder pins from cranes, I would weld a long
bar to the pin and use a porta power, jack or another machine to rotate the
pin.

 

[StephenR]

I tried to take a pin out of hydraulic cylinder on my friend's tractor. If she ever greased them, it was very little and very seldom. I got the other cylinder off for a rebuild. but no amount of PB Blaster and a heavy hammer would budge that one pin. When I reinstalled the rebuilt cylinder, I greased all the pins, however that one pin would not take grease. I have plans to take a tool with me to use to press the pin out. I have high hopes that I can get it to budge.

 

[fried1765]

Keep putting oil on them. It's difficult to wiggle, tap on,drive,twist or otherwise attempt to move pins and remove tension at same time when working alone. I've had some success by cobbling up and clamping spring tension on pins while I pry and move arms looking for spot where pins aren't binding.

KROIl is best!
Kinda pricy though.
Spray it once every da.y
Spray,,,,,,, let it sit for a few hours
wack it with 2lb hammer
whlel spray is syill kinda wwet