It sounds like you are having a problem with the wheel bearings on your Kawasaki Mule 4010 diesel 4x4. This is a relatively common problem with these vehicles, and there are a few possible causes:
The wheel bearings are not being installed properly. This is the most common cause of wheel bearing failure. If the bearings are not installed properly, they will not be able to support the weight of the vehicle and they will eventually fail.
The wheel bearings are defective. This is less common, but it is possible that the wheel bearings you have been using are defective. If the bearings are defective, they will not last very long and they will need to be replaced.
The wheel bearings are being damaged by something else. It is also possible that the wheel bearings are being damaged by something else, such as rocks or debris. If the wheel bearings are damaged, they will not last very long and they will need to be replaced. You can get it here at https://en.tradebearings.com/clist_184.html