Lately I understood something about the bearings JD8665. Those seem to be used on a lot of JD products and they are somewhat weird.
If you look closely you can see that the inner race is protruding from the bearing and that it has a non-concentric shape. Looks like a weird and complicated design doesn't it?
Well there is a reason and it's in fact quite nice. Those bearings are NOT meant to be press-fit, they are slide fit. The downside to this is that the inner race might have a tendency to spin on the shaft which is definitely not a good thing.
If you look closely with those bearings there is always a round "spacer" with them, JD8554. This part is called an Eccentric Locking Collar.
Those parts are meant to work together! The Eccentric Locking Collar's goal is to slip over the inner race and keep it from rotating by being locked to the shaft with a grub screw (set screw).
This concepts make sure the bearing can easily be installed on the shaft and that it will never spin on the shaft!
I had a hard time understanding this since my snowblower and my snowthrower were both really worn out when I bought them and most of the bearings sized in the past and when this happens the inner race of the bearing will machine the collar to the point that it will no longer have the eccentric feature.
Those collars are inexpensive, if you replace a bearing and the collar is worn or the grub screw is stuck or the Allen is stripped, don't waste your time and replace them!
BTW... When you are installing the bearings and they are giving you a hard time sliding on the shaft... Make sure the eccentric collar and the inner race of the bearing are aligned, if you use a hydraulic press and those are not aligned you will "wedge" the collar on the shaft and the inner race. In tight spaces it will be quite hard to remove. Ask me how I know that ):
Hopefully this information can help someone else!
If you look closely you can see that the inner race is protruding from the bearing and that it has a non-concentric shape. Looks like a weird and complicated design doesn't it?
Well there is a reason and it's in fact quite nice. Those bearings are NOT meant to be press-fit, they are slide fit. The downside to this is that the inner race might have a tendency to spin on the shaft which is definitely not a good thing.
If you look closely with those bearings there is always a round "spacer" with them, JD8554. This part is called an Eccentric Locking Collar.
Those parts are meant to work together! The Eccentric Locking Collar's goal is to slip over the inner race and keep it from rotating by being locked to the shaft with a grub screw (set screw).
This concepts make sure the bearing can easily be installed on the shaft and that it will never spin on the shaft!
I had a hard time understanding this since my snowblower and my snowthrower were both really worn out when I bought them and most of the bearings sized in the past and when this happens the inner race of the bearing will machine the collar to the point that it will no longer have the eccentric feature.
Those collars are inexpensive, if you replace a bearing and the collar is worn or the grub screw is stuck or the Allen is stripped, don't waste your time and replace them!
BTW... When you are installing the bearings and they are giving you a hard time sliding on the shaft... Make sure the eccentric collar and the inner race of the bearing are aligned, if you use a hydraulic press and those are not aligned you will "wedge" the collar on the shaft and the inner race. In tight spaces it will be quite hard to remove. Ask me how I know that ):
Hopefully this information can help someone else!
