7120 Kingpins

[highcotton]

Attempting to replace the front hub seals on a 7120. The upper kingpin was tough to get out, but the lower one absolutely will not move. Knuckle is smooth but I need to get it off to replace the small seal where the axle goes in- any tricks of the trade? I’ve assaulted it with multiple hammers, air hammer- nothing. 

[HydroTek]

Put the top one back in to hold things in alignment
loose the bolts on the lower pin
the weight of the tractor will help push it out

sledge down on the axle housing will also help
just dont get all crazy with the sledge 

[highcotton]

I put the top one back in to align everything, that bottom one will not do a thing. I’ll give it some encouragement with a sledge and see what happens. 

[Hudco]

i start with some thin hardened wedges somtimes their is a pry notch on some houseings also what  hydro tech said i do alot off case back hoes and telahandlers some times they can be stubborn

[HydroTek]

4 hours ago, highcotton said:

I put the top one back in to align everything, that bottom one will not do a thing. I’ll give it some encouragement with a sledge and see what happens. 

Let the jack down some so the weight of the tractor is helping
if you have the wheel off -- use some blocking under the hub 

Never had one that would not budge
and use a little anti seize when you go back 

You can run a weld bead inside the cup in the housing to shrink it
easier to remove for replacement if needed

[SDman]

Never fails....its always gotta be that bottom SOB that doesn't move on a Dana/Magnum axle.

I hate doing this....but sometimes it the ONLY way to get those things to move. Turn your wheels all the way in one direction to allow you to get a straight shot at this. Find your ABSOLUTE best air hammer with an air punch bit. Working behind the hub/knuckle assembly just under the u-joint, pound through the bearing cap(item #38 in the picture) on the backside of the kingpin/bearing assembly. In the best-case scenario, you will only have to replace the cap itself and still be able to salvage the kingpin for reuse. However, I have had to replace several kingpins through the years as by the time you get them punched out of the axle housing, you don't have much left of them. 

I've had guys try to jam a chisel in between the kingpin and axle housing, only to have the 4-bolt flange part of the kingpin break off of the bottom part of the kingpin. That's not fun, either.

Once you get them to start to move, they usually will come out without a lot of further grief. But getting them to move.......

[756puller]

Usually have luck taking an air hammer on the bolt holes and start making it turn  than smooth up the holes when I'm done.

[tommyw-5088]

i got mine out by turning it be the square 

part with big pipe wrench and 8 foot pipe on it 

[Cdfarabaugh]

5 hours ago, SDman said:

Never fails....its always gotta be that bottom SOB that doesn't move on a Dana/Magnum axle.

I hate doing this....but sometimes it the ONLY way to get those things to move. Turn your wheels all the way in one direction to allow you to get a straight shot at this. Find your ABSOLUTE best air hammer with an air punch bit. Working behind the hub/knuckle assembly just under the u-joint, pound through the bearing cap(item #38 in the picture) on the backside of the kingpin/bearing assembly. In the best-case scenario, you will only have to replace the cap itself and still be able to salvage the kingpin for reuse. However, I have had to replace several kingpins through the years as by the time you get them punched out of the axle housing, you don't have much left of them. 

I've had guys try to jam a chisel in between the kingpin and axle housing, only to have the 4-bolt flange part of the kingpin break off of the bottom part of the kingpin. That's not fun, either.

Once you get them to start to move, they usually will come out without a lot of further grief. But getting them to move.......

Why no jackscrews to extract them?  Deere has this issue as well

[Gearclash]

1 hour ago, Cdfarabaugh said:

Why no jackscrews to extract them?  Deere has this issue as well

I have wondered this myself.  Deere likes to use a pair of these beastly doubled roll pins as pilots for the kingpins.  They go together OK when everything is new and greased but there is nothing easy about removing them.  

[Kevin in ky]

I had to replace one and couldn’t get it out.Hired a local fabricator repairman to do it. He used torch and hammer possibly porta power to get it out.

[CIHTECH]

Whichever one comes out first, top or bottom. Add a spacer under that king pin, 1/4'' thick and install king pin bolts back in, snug them up and start tapping around the tight one, keep snugging bolts up and it will bring them apart. Have done many this way. Just takes some time and use good penetrating oil. Keeping the one that came out still in place keeps everything in line and helps as well.   

[Hudco]

thats somthing i havent done but i will add that to my bag of tricks on the next one