I've not had a lot of exposure to the model you refer to, so I'm not familiar with its internal workings. My limited information on this model indicates these were made as a spin-off, or licensee arrangement, with the original Allis-Chalmers Hydrocone model crushers. The A-C machines were quite reliable relative to the area where you're experiencing problems.

Bearing failures in any crusher of structural substance involve lubrication, alignment, or clearances. The issues of proper lubrication focus on proper temperature, cleanliness and pressure.

If lubrication matters are known to be in order, machined fit alignments and clearances become the subject. Continual loss of bearing fit or proper clearance will eventually affect basic machined alignments and finish tolerances.

Start with the oil and then go to the measuring. I understand that the Jaques line of equipment is now a Terex property -- they should be in a position to help you with the details of your ongoing problem.