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Hoist pin clearances

J

JOB

Member
I have a truck hoist that I am working on. This is a rough drawing of the hoist, and mine is not made exactly like I have drawn it. The pin at point C is froze up, so I have cut the hoist apart and am in the process of making a new pin and sleeve or bushing whichever it is called. At points A and D there is roughly .060 thousands clearance between the pipe and the round stock that goes into the pipe. That .060 could be from wear; this hoist is far from new. Point B I can not measure for you can not get it apart because it is not necessary. There is quite a bit of clearance at point B though. The yoke at the end of the cylinder should have been drawn with dotted lines for it is inside the frame work. All the pipe used on the hoist appear to be schedule 40.
Does anyone know how much clearance is at these points or does it really matter? I was planning on putting .030 to .040 thousands at point C. Any thoughts?

mvphoto21245.jpg
 
have seen it posted where the repair was a round pin in a square tube.
this way can't rust and bind up
not certain which board it was on
sure seemed like a good way to repair it
good luck
Ron
 
I saw that post also. This hoist is off the truck and am rebuilding the entire thing. Thought I would rebuild it the same way it was built.
 
I would bet that they had .050-.060 when they were new. They have quite a bit of slop in them. If you don't they will bind up with rust.

I have had to cut them off and press them apart. Used to get a couple each fall. Guys would dump their wagon and not be able to get it back down.

I usually could just weld the old pieces back on after I pressed them apart and cleaned them up.
 
I had thought about pressing out the shaft also. The way the one I have is made you can not press it apart without a lot of surgery. Then you would have a big mess. I felt it was easier to make new pieces and a new pin and sleeve, then weld it all back together. If I was building hoist's I would build it like the one I drew, not like the one I have.

Maybe .040 thousandths isn't enough but .060 thousandth is right at 1/16 of an inch. It would hold more grease around the pin though.
 
They fit fairly loose, never measured them tho. It
was my post on the round pin/square tube repair.
It's here in tool talk if you want to look it up.
 
The hoist you repaired looks like the one I have. Only yours is bigger. The round stock through mine is maybe inch and a half. The tube it goes through is one and seven eights outside diameter. That is the same dimension as inch and a half pipe. The inside dimension of inch and a half pipe is around one inch and .610 thousandths. If inch and a half round stock is used you would have .110 thousandths clearance which I thought was excessive. I was planning on having a piece of round stock turned down to get a tighter clearance. Maybe I should not and just put in the inch and a half round stock.
 
I would use the 1 1/2" round and machine out the pipe a bit and get a brass bushing to fit the shaft. I linked a company that can fix you up with the bushings if you need.
Untitled URL Link
 
I don't have a band saw so I took the froze up pin and sleeve (pipe) to a guy that does. Cut the sleeve and pin in half and this is what I found.

The sleeve was made out of inch and a half tubing and the pin was one and seven sixteenth cold rolled shaft material. The manufacture did it that way to save machining costs. So points A and D is made from two inch tubing and inch and fifteen sixteenth cold rolled shaft material. That's is why there is .060 thousandths clearance there.

I now have a piece of inch and a half tubing and a inch and a half rod that I will have one sixteenth cut from. Then I should have a pin and sleeve.
 
JD you were on the money with the one sixteenth clearance at the pins. just found that out today.
 
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