G'day My sk120 mark v super has a lot of wear in its pins and bushes. The worst are the hitch pins and the boom rams. This may b a newb question but every one talks about changing pins and bushes. Now the pin part I understand but where are these bushes?? I've had all the rams off my machine to get them resealed and I couldn't make out any bushes. There is also side play in each pin which I would assume can b fixed with the correct amount of shims. Cheers
The bushings are what the pins slide into. Normally there will be a bushing on each side of a large pin along with seals to help keep dirt from coming in. If you let the bushing wear out and then start wearing into the bin bosses the repair gets a lot more complicated and costly. Not too bad of job to replace the bushings and pins if need be. Just dont let it go to long and cause yourself a lot more work.
G'day So should I have seen these bushes when I pulled the rams out? I did notice the rubber seals on the rams where the pins goes through but I didn't notice that they could come out. At the end of the dipper arm where the pin connects the hitch to the dipper it looks as though there is a couple of large o rings (say 10mm in diameter), have they come adrift from somewhere or are they normally floating between shims? Cheers
You will need bushing drivers to remove the bushings properly and to insert the new ones back. They are a very tight fit to insure they do not move when the pins are inserted. The O-rings are the seals and they will need to be put back in once the new bushings are installed.