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The GPz900R rebuild page was getting quite slow to download, so I seperated out some of the content to this page to make it a bit easier to load and follow.
If you have not read the previous page, the swingarm has been vapour blasted back to bare alloy and clear coated with a marine grade clear coat. the old bearings were shot since there is no way to grease them.
On the left is the needle roller bearing (one of four) that the GPz900R swing arm pivots on. On the right is a special tool that I have had made to push the bearings in.
The needle roller bearing sits over the end of the tool. There is a lip to retain the bearing and a lip machined to the depth and a ridge to stop the tool on the outer edge of the swingarm. On the other end is some extra length if the bearing needs to go in deeper for any reason.
Step one is to do a dry run of setting up the swing arm in the press with enough clearance for the tool to fit. Once you have worked out that you can push the bearing in with no unforeseen disasters put a light coating of oil on the bearing surface and then setup the swingarm into the press. Put the tool in place and gently lower the press down onto the tool.
The oil will help it glide in straight. If it starts to tilt sideways then something is dramatically wrong, stop and make sure the rod, tool and swingarm are in alignment.
Once you start pressing the bearing in, the whole assembly should be self supporting.
The run of photos below show the bearing going in and where the tool stops. The press is a 6 ton and the task is effortless for it. If the bearing makes snapping noises as it goes in then just use a piece of timber between the ram and the tool to reduce the stresses.
When the ram is lifted the tool sits in place, when removed the bearing is at the correct depth and in perfectly working order. Only three more to do. The outside bearings are easy to push in.
Doing the inside bearings takes a bit more effort with the small press, if the ram is to large you can't get it through the existing bearings. Once done, turn the swing arm over and do the other inside bearing and your done!
The completed swingarm ready for installation. The arms are installed, the bearings for them were pressed in a week earlier. The outside seals are installed, I will put grease in when I am ready to install it. The arms are greased and hold themselves in place with no play.
