Be sure to use a bar that is larger than the internal diameter of the bush but smaller than the outside diameter. We have pulled together a few tips and tricks from plant fitters to help you out!ġ) Brute Force! A good old hammer and bar is often enough on smaller excavators especially if the bushes are quite worn out. Typically if you are at the point of removing them, then they are worn out so it doesn't matter what damage you do to the old bushes but you really want to preserve the integrity of the excavator arm at all costs. The first challenge when replacing the bushes in the arm of your excavator is to remove the old bushes. We always recommend replacing both the pins and the bushes together as both will wear together over time so only replacing one part can often lead to bigger problems. Once the pins are removed it is time to work on the bushes. Often if you are removing the boom to replace the kingpost bushes you will need an overhead crane or a sling on a forklift to assist with removing it and getting it back into position again. With the pins at the dipper end of the machine, removing them is normally fairly easy but as you get further up the dipper arm and through the boom to the kingpost you need to start to ensure that the arm is well supported before you start to remove the pins. Whatever the type on your excavator this needs to be removed, and then the pin should be able to be removed. Other machines have a thread in the end of the pin which a bolt is screwed into. Takeuchi excavator tend to have a large nut and washer on the end of the pin, Kubota and JCB excavator often have a hole drilled in the end of the pin and a bolt is secured down through it. How to replace excavator link pins / boom pins / ram pinsĪll pins will be secured into their position but the way this is done varies from machine to machine. For this reason we put together a seperate resource which can be found here: How to change the bucket pins for ecavator The bucket pins on a excavator are used to hold the bucket to the excvator. These are replaceable wearing parts and the following article gives some advice around some of the challenges around replacing them. Seems like 0.28-0.35 mm clearance is a lot for something of this scale.As excavators get older the constant use means that regularly wearing parts such as the pins and bushings start to wear out. Does that make sense or is it wishful thinking on my part? I've attached the drawing from Bobcat. I'm thinking that if I can get a new pin and/or bushings with tighter tolerance that it will stay tight longer. I find it hard to believe that Bobcat designs these with that much play. So I installed them and it seemed a little tighter but didn't take long to get loose again (yes I do use grease ). ![]() I measured and they were within tolerance. So I contacted the dealer to make sure I hadn't gotten improperly sized parts, and they sent me tech drawings of the pin and bushings. I'm no mechanic, but I usually work on my own equipment when I can and it seemed way too loose to me. So I ordered them from Bobcat and when I got ready to install them I slipped the brand new bushings over the brand new pin and there was a fair amount of slop. I bought the machine almost 4 years ago and when I got it, I thought it needed new pin and bushings for the arm to boom joint. ![]() I don't post here often but I'm having a bit of trouble with my mini excavator.
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