Stuck pin on 9250 backhoe (need advice!)

JAY AND EBBEN · Post by **JAY AND EBBEN** » Thu Jun 30, 2011 9:02 am

My son and I are struggling to install a new "dogbone" swing link on our backhoe. We cannot for the life of us remove the main pin that is the pin on the right in the following link. Look at the fourth photo in from the left. https://picasaweb.google.com/1088890998 ... directlink

The pin appears to be the same type as others we have removed - tapered pin (on both ends) with tapered split collars with bolts on the ends. We removed the bolts and washers fine. The pin can drive up and down ok but neither of the collars will drop out. They both jam tight prior to coming out.

Question; should the pin or collars be able to be driven out either way? Are there flanges that prevent the collars from coming out? We are afraid to drive the pins/collars harder for fear of breaking a big casting.

We now have the bucket swung to one side and the upper arm is supported with a tractor bucket for safety. We can see down the pin hole and it LOOKS like the assembly is clear to come out - but when we drive it from underneath it jams and same from top.

Any advice is appreciated!

Thank you.

Jay and Ebben

JAY AND EBBEN · Post by **JAY AND EBBEN** » Thu Jun 30, 2011 9:04 am

ps.

We are trying to pull apart this main assembly as that seems the only way to remove the broken dogbone. Are we on the right track?

Thank you.

J

dozingdozer · Post by **dozingdozer** » Thu Jun 30, 2011 9:15 am

i would strongly suggest you check out the online parts diagrams and make sure you dont have any retaining rings, clips, pins, bushing etc that might be the problem. if there are none- you might just have to 'worry' it out with a deadblow or brass hammer.dd

JAY AND EBBEN · Post by **JAY AND EBBEN** » Thu Jun 30, 2011 10:11 am

Thank you... I have looked at the on-line parts diagrams but it seems like they only show a later model backhoe. My best guess is that this is a 70's model. When I look directly at the castings I can't see any way to access retaining pins or such. I do know I can see the outside ends of the cups and I do not see any retaining clips on the inside. What I wonder most... are the cups or pin shaped to prevent going up or down all the way? I can lift the top collar up with magnets but it seems to hit something else (that I can't see). The collar itself is loose in the hole.... just won't lift out!

J

KenP · Post by **KenP** » Thu Jun 30, 2011 10:19 am

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JAY AND EBBEN · Post by **JAY AND EBBEN** » Thu Jun 30, 2011 11:41 am

So it sounds like we should be OK if we pound as hard as humanly possible with a dead blow hammer on an extended rod? no retainers that we need to worry about? We never thought of a wear ring that might be catching.

J

Reminder; there is a photo link on the first post of this thread - to see the problem.

KenP · Post by **KenP** » Thu Jun 30, 2011 1:32 pm

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dozingdozer · Post by **dozingdozer** » Thu Jun 30, 2011 1:36 pm

the only thing you should beat is the odds! a hammer in the wrong hands is a brutal tool! be careful!dd

Tigerhaze · Post by **Tigerhaze** » Thu Jun 30, 2011 1:41 pm

Is there a reason you can't torch out the end of the pin to remove it (assuming new pins are available and you can do so without burning through other parts).

dozingdozer · Post by **dozingdozer** » Thu Jun 30, 2011 1:51 pm

i just looked at 350c parts for your assembly and i dont know if they are the same. if they are similar i suspect that the excessive tourque and stress on the steel bracket has probaly led to the dogbone failure and has probably tourqued the pin, and caps, and pin housing severely out of alighnment and maybe deformed the housing. heat and then cold might work, but again i would not expect to have any usable parts to the assembly after that. go easy with the hammer. maybe if you tried to put some force on the hoe arm it might give. safety first. dd

JAY AND EBBEN · Post by **JAY AND EBBEN** » Thu Jun 30, 2011 4:38 pm

Victory!

I knew the alignment was good, and even wiggled the hydraulics a little to see if there was a "sweet spot" - no luck. I must have driven the pin/caps up and down 50 times and always they would lock. Then I noticed the bottom end was bunged up by a former "mechanic". I hated to do this but I could think of nothing else... I took a 1 1/2" drum sander and got up in the last 1" or so where it was hanging up every time. Nothing. Nothing. Nothing... and then on the fourth try it zipped right by clean as can be! I think we should be fine.... I removed almost very little material and it is below the final landing of the pin/caps.

I used hardwood HD dowels and a 2 1/2 lb hammer with limited swings. No heat needed.

Thank you so much for helping us through this and our other 350B hurdles. It gives us some new hope that we can do this after the loss of the two coolest men in our family... tough winter.

ISSUE RESOLVED

God bless you all!

dozingdozer · Post by **dozingdozer** » Sun Jul 03, 2011 6:33 am

way to go and congrads. its always a good feeling when something works its way out!dd

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Stuck pin on 9250 backhoe (need advice!)

Stuck pin on 9250 backhoe (need advice!)

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