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Tool Talk Discussion Forum

Hinge pin material

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MNBob

11-21-2007 11:01:49




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Need new hinge pins. Have a PJ dump box trailer that has always been stiff and noisy to open the gates. Loaned it to relative, he did not lock the gate back and lifted the bed. Broke the gate off. Both hinge pins snapped. Just got them out, 4 hour job. They are brass. Closed top and bottom and fitted in tight. What is best material to replace them? I intend to put in oil holes on top and drain hole on bottom. Good idea or? Thanks Bob

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cannonball

11-22-2007 06:06:55




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 Re: Hinge pin material in reply to MNBob, 11-21-2007 11:01:49  
You did not say what size the pins are...but chromed hyd cylinder rod works good for all pins, use then in loaders all the time..press out the pin in a lever (steering arm in some jd tractors) and press in new ones out of chromed rod...



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dobber

11-21-2007 12:37:29




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 Re: Hinge pin material in reply to MNBob, 11-21-2007 11:01:49  
When there wasn't room for threads for a grease fitting on something like that I tack welded on a nut the zerk would thread into or a small 1/8" pipe fitting too just don't warp the hinge tube. You could always expoxy or JB weld a zerk or oiler cap on too. If it has to sit outside for storage I'd go back with brass or stainless shaft for the hinge.



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MNBob

11-21-2007 12:45:07




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 Re: Hinge pin material in reply to dobber, 11-21-2007 12:37:29  
Dobber; Great idea. I can weld on a nut and use grease. Thanks for the idea. It will be outside and that will be better than oil. Bob



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nballen

11-21-2007 11:38:13




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 Re: Hinge pin material in reply to MNBob, 11-21-2007 11:01:49  
Steel will work.

If you bought the trailer new, the pins are probably brass for a reason - so that the hinge pins (replaceable) takes the wear instead of the hinge tubes (probably welded, therefore harder to replace).

Are the pins solid?

The "stiff & noisy" sounds like the pins were a) bent, b) dry; or the hinge tubes were not properly aligned from the beginning.

I think the grease zerks sound like a good idea - if there is enough room in the hinge for grease.

You might try a factory replacement (if you haven't tried that yet).

Nathaniel

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MNBob

11-21-2007 12:39:13




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 Re: Hinge pin material in reply to nballen, 11-21-2007 11:38:13  
Nathaniel; I did buy it new, its always been a pain with the hinges, hydralics are ok but marginal for lift when loaded. May be hinge on the bed lift. Brass dont rust but it sure froze up in there. I do believe you are right about the alignment. Will put in a slightly undersized pin and use oil regular. Thanks, Bob



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old

11-21-2007 11:08:41




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 Re: Hinge pin material in reply to MNBob, 11-21-2007 11:01:49  
If it where mine I would use round stock for the pins, (steel) and I would also drill holes for grease zirks instead of oil holes. Grease will stay in place better and for that job work a lot better



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MNBob

11-21-2007 12:33:20




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 Re: Hinge pin material in reply to old, 11-21-2007 11:08:41  
Thanks Old. I would like grease zerk but dont see how unless I replace everything. If it continues to give trouble I will replace the hinges and pins. Bob



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old

11-21-2007 13:32:20




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 Re: Hinge pin material in reply to MNBob, 11-21-2007 12:33:20  
I agree with Gerald. If the pin size is 1 inch use a 1/16 inch drill bit. If the pin is smaller use a smaller bit for the grease holes. Or you might find some premade pins with the grease fitting already made into them



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Gerald J.

11-21-2007 12:49:20




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 Re: Hinge pin material in reply to MNBob, 11-21-2007 12:33:20  
Put the zerk and grease passages IN the pin. Drill a SMALL cross hole at the middle of the pin and a SMALL hole from the end of the pin to intersect that cross hole. Then open up the hole at the end of the pin to thread 1/4-28 for a zerk. I emphasize small especially for the cross hole because that hole weakens the pin. I did a 3/16" or 1/4" cross hole in a 1" pin and it broke at the cross hole. Probably should have made the cross hole 1/16" and I think I did for the replaceement on a back hoe and haven't broken that pin yet.

Gerald J.

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