Defeated by roll pin

Messages
472
Location
Alabama, USA
Thread starter
Lawn boy 10685 approx. 15 years old. Grinding from self propelled gearing on rear axle. Check YouTube on removing and replacing the gears. Came apart ok but unable to remove drive pin holding gear to rear axle. Disassemble rear further and put axle on the vise. No luck. Liquid wrench, let soak overnight, buy new set of punches. No luck. I counted 50 blows with a 2 lb mini sledge hammer and punch....would not budge. This assembly has lived in grease it's entire life...never dry. Counted 100 blows with a small ball peen hammer and punch. No good. Finally hit it with the ball peen and no punch and could drive it flush but no further using any combination of punches and hammers. You could see the liquid wrench "sink" around the pin but it simply would not budge. Gave up and put it on the bench grinder and ground it and the gear down about 1/8 inch. Ground so slick you could hardly see the pin. More liquid wrench, punch, and hammer.....nothing..... I don't think I learned anything......just a disappointing experience..🦨🦨
 
Messages
320
Location
Reno, Nevada
I had a similar experience with a roll pin on a very used Craigslist pallet jack. Defied big hammers and assorted punches. Finally burned it out with a torch and even then it fought the whole way. I still don't have an explanation.
 
Messages
1,325
Location
texas
drill a small hole through the middle much smaller than the pin itself to allow it to collapse away from the ID of the hole.
 
Messages
1,859
Location
Minnesota
Originally Posted by danez_yoda
drill a small hole through the middle much smaller than the pin itself to allow it to collapse away from the ID of the hole.
Bet answer yet. The pin probably got muchroomed on the end, making it nearly impossible to remove.
 
Messages
10,425
Location
Cincinnati, OH, USA
Be careful drilling it, if you break a bit off in it, it'll be even harder to remove. Mount it in a vise if possible, get it good & hot with a torch, hose down the pin with Deep Creep or similar, start hammering-as long as it's not mushroomed it should come out.
 
Messages
8,871
Location
Marshfield , MA
Using a hammer directly without a punch may have mushroomed the ends. Drill with an over size bit to make a sort of countersink.. Use the right size punch. Too small will just swage the pin in tighter
 
Messages
8,871
Location
Marshfield , MA
That's a solid pin. Roll pins are hollow. Some sorta spring steel bent into a hollow tube. I would use an under sized but just barely punch and pound the snot out of that pin. At the slightest movement,reverse direction, Rinse and repeat. Please post a follow up. grin2
 
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Messages
697
Location
MN
That's a solid pin and may have been put in with a shrink fit. They either heat up the assembly before driving a cold pin or they freeze the pin and drive it into an air temp assembly, sometimes they do both.
 
Messages
8
Below are results from 50 blows with a small sledgehammer and 50 blows with a ball peen hammer. No discernible movement. I’ve ordered a replacement transmission (with gear mounted on axle) and will replace it as a unit.....
I’ll probably try something more drastic in the future unless someone wants it to try themselves.....:cool:

thanks to everyone who responded.......
425F72BA-3F01-43B7-9D00-6BB7FAA16F12.jpeg
 
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