Replacing shovel bushings

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  I'm soon to have to replace the boom end bushings on my HD7G. Any advice on this. I was wondering if the bushings are strong enough to be driven in without distorting them. Do they need to be reamed to size after installation? What is on there now are ruined, likelly by not having grease fittings. On the B model, they had grease fittings on the boom ends,  as it should be. I think these on my tractor were supposed to have rifle drilled pins to grease them. Anyway, I'd appreciate any advice on preparing for this job as I'm doing this job in the middle of nowhere. Corey

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doctorcorey Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 17 Jul 2011 Location: S. KC Missouri Points: 570	Post Options Post Reply Quote doctorcorey Report Post Thanks(0) Quote Reply Topic: Replacing shovel bushings Posted: 15 Nov 2011 at 1:32pm
	I'm soon to have to replace the boom end bushings on my HD7G. Any advice on this. I was wondering if the bushings are strong enough to be driven in without distorting them. Do they need to be reamed to size after installation? What is on there now are ruined, likelly by not having grease fittings. On the B model, they had grease fittings on the boom ends, as it should be. I think these on my tractor were supposed to have rifle drilled pins to grease them. Anyway, I'd appreciate any advice on preparing for this job as I'm doing this job in the middle of nowhere. Corey

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Coke-in-MN Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Afton MN Points: 41211	Post Options Post Reply Quote Coke-in-MN Report Post Thanks(0) Quote Reply Posted: 15 Nov 2011 at 2:30pm
	If your lucky the boss area has not been distorted or there is old bushing left so the hole is not deformed . Have found in the old machines the areas under the bushings are worn and makes new bushings a job to get tight , I have welded up some and then ground back to fit bushing , then used a plastic steel to fill areas where i could not get hole back to spec or where there were low areas the reamer would not smooth. Its not as good as having the arm or hole re-machines ot spec but it works. Most of the steel bushings are to size when driven into position. Rifle drilling of the ppins was a common way of greasing pins and bushings. I have cut gruve from the grease hole around the pin so grease can flow around the pin also as the single hole can plug if not greased often . Have also drilled and tapped grease zerk into frame at buchet end then welded a nut over the zerk area big enough to allow grease gun to get to zerk but protect the zerk from dammage.
	Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful."

orangeman Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Points: 1681	Post Options Post Reply Quote orangeman Report Post Thanks(0) Quote Reply Posted: 15 Nov 2011 at 6:06pm
	Corey: Recommend you go to a Kaman Bearing store near you, if possible and ask for bunting bronze bushings. Spend some time with your micrometer and favorite measuring device and take the total length of all the holes that you wish to re-bush. You will need to mic. your PIN Outside diameter or OD. The mic the ID of the hole where the bushing exists. Purchase one length of bronze bushing and if you have a metal lathe cut the bushings to length and then press them in. I found that an OTC ball joint press works real well, but expensive. A more cost effective solution is to go to Harbor Freight and buy a Chinese rip off of the OTC Ball joint press. I re-bushed my Dynahoe backhoe with Bronze bushings and it works well. Agree that you would be wise from a PM stand point to install grease fittings if none exist. Good luck - Orangeman

doctorcorey Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 17 Jul 2011 Location: S. KC Missouri Points: 570	Post Options Post Reply Quote doctorcorey Report Post Thanks(0) Quote Reply Posted: 15 Nov 2011 at 6:26pm
	I do have a good ball joint press, although it might not have the length capacity for these bushings. Maybe if I press them in with the pin together it will help stabilize the bore. At any rate, I've got to first get my hands on the parts and then I can tear it up. Right now 'til hard winter, I've got to work the machine and finish my pond. Thanks for the advice, good food for thought.

Coke-in-MN Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Afton MN Points: 41211	Post Options Post Reply Quote Coke-in-MN Report Post Thanks(0) Quote Reply Posted: 15 Nov 2011 at 7:33pm
	I would make sure you can't find original sizes before going to bronze or oil lite bushings . the areas of high impact or load can do in brass real fast . I used oil lite and brass in my Henry loader at the bucket to size down the original 1.5 " pin size to smaller shaft but the tractor takes no where near the stress or load of bucket on crawler.
	Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful."

Rawleigh Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 14 Sep 2009 Location: White Stone, VA Points: 421	Post Options Post Reply Quote Rawleigh Report Post Thanks(0) Quote Reply Posted: 16 Nov 2011 at 10:51am
	Mcmaster Carr has a great selection of bushings. You can get bronze or steel shell bushings from them. Edited by Rawleigh - 16 Nov 2011 at 10:51am

doctorcorey Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 17 Jul 2011 Location: S. KC Missouri Points: 570	Post Options Post Reply Quote doctorcorey Report Post Thanks(0) Quote Reply Posted: 16 Nov 2011 at 11:14am
	Thanks, everyone.