After you get the bearings in then reassemble in the reverse of how you took the wheels out. Driving the bearings back into the new wheels, make sure you press them in using a press or if you want to do it the old school way and drive them in using a hammer and a flat steel plate just make sure they go in straight not damaging the inside of the wheel. You can drive the bearings out of the wheels and try to reuse them but if they have excessive play or the seals are damaged you should probably replace the bearings, check the washers or shims also and replace if they are worn any. Pay attention to each side of the wheel because they usually have washers or shims or both so make sure you keep track of them and how they are placed inside each side. Once the axle is removed the wheels should drop down, you can then pull them out of the outrigger. Once you get the roll pin removed use a brass punch or rod to drive the axle out. Make sure you use the same size roll pin driver tool so you will not damage the hole in the axle. This pin is usually a roll pin recessed inside a groove on the side of the outrigger leg where the axle pin is. Once you have the lift wheels raised off the floor and stablized then you can drive out the roll pin. Have some blocks ready and set the outrigger down on top of the blocks to stablize the lift. you will need to get a forklift jack that will fit underneath the outrigger or the side of the lift so you can jack up that side of the lift to get the wheels off the floor.

Most of the time i just replace them all so there will be no problems. Replacing just one side or just a front or back wheel will cause uneven travel or uneven pressure on the loadwheel assy and only one wheel in the pair will touch the ground.

This has to do with level and stablility of the lift so it is a good practice to do. One important note about replacing load wheels, they have to be replaced in pairs if there is much wear on them. If your speaking of the outrigger loadwheels they are fairly easy to change.

Jungheinrich load wheels