Backhoe Hinge Pins

[rock_breaker]

Finally got two of the seized pins out (thought I had one loose but the retaining pin had fallen out). They are made of 1018 or similar metal that a file will cut so I am thinking of cutting a groove around the circumference and a longitudinal groove opposite of where the grease comes in.
I would certainly appreciate comments about the feasibility of doing this.
Have a good day.
Ray

 

[Weldingrod1]

Should be ok. Radius groove, please! Also, I'd go for a radius much larger than the depth. Like a 1/4" ball nose and just kiss the surface. 0.05" deep, maybe?

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[Packard V8]

What is the diameter?

jack vines

 

[Nutfarmer]

Around our farm the backhoe is probably the most neglected peace of equipment. No one wants to take the proper time to grease it. What I have found very useful for plugged grease fittings and frozen pins is a cylinder with bore of about 3\8 inch with a close fitting rod for a piston. On the exit end of the cylinder is a grease coupling . The cylinder is filled with penetrating oil and the piston is hit with a hammer while the coupling is hooked up to the frozen pins grease fitting. It has saved me from having to disassemble seized pins. Will post a picture when back at the farm. I wouldn't cut a grove around the circumference of the pin because it will make a stress pin where the pin could brake. If you want to make sure that the grease flows to the whole pin try a spiral grove around the pin or bushing . On the bliss punch presses I worked on the bronze bushings were spiral cut with a carbide burr to keep the grease evenly distributed. I have quit loaning out the backhoe because of problems like you have had. If it leaves the farm I go with it. I have found that it's better for me to donate a couple of hours than to spend a couple of days repairing.

 

[markba633csi]

Good idea- do you fit an o-ring on the piston or just make it close fitting?
-Mark

 

[Nutfarmer]

Most of the ones I have seen have an oring on the piston. It is surprising how much pressure the oil can build up

 

[Scruffy]

I really hate to comment but I will . I'm taking it's a old hoe? In the last few years, I've probably made 25 or 30 pins for old loaders, hoes, excavators, ect.
I always cut a radius groove around where the zerk is, if it's old and worn it's the only way you will ever get grease all the way around the pin.
For the pin use a steel softer than the castings, not the bushings. It's easier to change pins ,than build up, and linbore castings.
I have a old 310 jd hoe that one pin on the boom was a pain in th but to grease, I drilled from the end to the center of the cross drill and it hasn't broke in ten years of abuse. Just my thoughts after being around old wore out junk for ever.
Thanks scruffy Ron

 

[brino]

I really hate to comment but I will . I'm taking it's a old hoe? In the last few years, I've probably made 25 or 30 pins for old loaders, hoes, excavators, ect.
I always cut a radius groove around where the zerk is, if it's old and worn it's the only way you will ever get grease all the way around the pin.
For the pin use a steel softer than the castings, not the bushings. It's easier to change pins ,than build up, and linbore castings.
I have a old 310 jd hoe that one pin on the boom was a pain in th but to grease, I drilled from the end to the center of the cross drill and it hasn't broke in ten years of abuse. Just my thoughts after being around old wore out junk for ever.
Thanks scruffy Ron

Ron,

Please do NOT hesitate to comment, EVER.
It is the input from guys that have "been there and fixed that" that make this all worth while!

We need the input from seasoned guys like you to keep this all going.

-brino

 

[rock_breaker]

The pins are 1" diameter with a hint of machining on one.
and fit into 1" tubing and there are no o-rings. The hoe is an attachment that can be removed from the tractor when the three point lift is to be used. I believe it was made in South Korea. There are some good ideas here and I do have a lathe and 2 mills in my shop!

Brino is certainly right about making constructive comments and contributions to this website. Thanks to each and every one of you responders!

Have a good day
Ray

 

[Liljoebrshooter]

My old case 580c doesn't have enough power to break pins.
Joe