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1973 MF40 pivot pin

H

Hrobertson1

New User
I am hoping someone can offer knowledge. I bought a 73 MF40 industrial at a yard sale, had to hire a crane to get it loaded. It hadn't ran since about 1980. Amazingly with cleaning the tank and few other little things it fired right up. Now the problem is the hydraulic steering. Neither wheel would turn. After rebuilding the pump it turns out the left side Pivot pin is stuck, the right will turn with the tractors wheels off of the ground and tie rod and cylinder removed by hand easily. The left is just stuck solid. I tried pumping grease in until the pressure was trying to put it back in the gun. Put a chain to the bucket, around the front, to the back of the tire. the chain was so tight I could play notes. Put a 48" pipe wrench, feet against a wall, body off of the ground. Tried heating the outside until it was hot. Took the tie rod part off of the top so it was just the pin, and spent about 20 minutes going at it with a 12lb sledge. Never moved even 1/100 of an inch. I have never seen anything stuck like this. Any help/tricks at all will be greatly appreciated.
 
I would try more heat hr, but not quite so much torque :lol: the kingpin is seized solid to the spindle so using the torch heat the spindle evenly all the way around it until it is almost red hot, remove the heat and wait 20 minutes for it to cool and bust the rust grip, then using your 48" pipe wrench see if you can get it to move, if not repeat. I have used this method with seized pins in tipping sills on dump boxes and some times it takes 3 or 4 trys to get it. john c.
 
You realize Harbor freight will not have the tanks or the gas. Only the controls and hoses and I don't know if tips are avaible or not. My torch dates to 1979 long before I ever heard of a Harbor freight. Bought tanks and outfit all from local outfit that sold the torch and tanks and gas.
 
So I have tried more heat cycles than I can count, with slow and quick cool downs. I filled and tapped an additional 7 grease fittings, and during heating, grease and smoke would come from the top and bottom. Soaked the top in pb blaster, and WD-40 for weeks now, and still stuck solid.
 
17709.jpg
 
I can still see paint is still on the axle indicating it hasn't been nearly hot enough. I would also recommend putting the pipe wrench on the bottom to avoid chewing up the top anymore. Torches and tanks are expensive, but pay for themselves if you do much work.
 
(quoted from post at 20:58:48 06/03/18) So I have tried more heat cycles than I can count, with slow and quick cool downs. I filled and tapped an additional 7 grease fittings, and during heating, grease and smoke would come from the top and bottom. Soaked the top in pb blaster, and WD-40 for weeks now, and still stuck solid.
Click to expand...
good morning h.robertson, what kind of torch set up are you using? as 47 fivewindow said it doesn't look like your using an oxy/aceltalean torch, it looks like you've been using a propane torch, not near enough heat. if you heat that spindle to nearly red hot there will be no paint left for sure.
 
No where near enough heat for sure, that is a lot of metal, its going to take a whole bunch heat, and its going to take a long time to get all that hot enough.
 
No where near enough heat for sure, that is a lot of metal, its going to take a whole bunch heat, and its going to take a long time to get all that hot enough.
 
Thanks all, went out and got an Oxy/Ace torch, going to give it a shot with that. Wish it wasn't 106 degrees out today :( , lol
 
Success!!!! well somewhat. Heated it with the oxy/ace for about 30 minutes, put the 48" pipe wrench, with 3 foot of pipe on it and got it to move about 4" back and forth :). Not fixed, but more than I've gotten in the last 2 months. Thanks all for your knowledge!
 
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