Rear Axle Noise in My Kubota "B" Series Tractor 

You probably suspect that an axle bearing is going bad. Nope. What is causing the noise is the fact that one (or both) of your rear wheel hubs is loose and is being allowed to "wiggle around" on the axle. It will sound just like a bearing that is being "ground up". You better tighten the hub retainer bolt before you wear out the hub and the axle. If it will not stay tight, the hub may already be worn past the point of no return. Also if you have one of the early style hubs with a bolt/spring arrangement, you may want to consider replacing these with a new style that has a heavy duty "wedge bolt" clamping design. Please be aware that the pin that goes completely through the hub and axle is not there to hold the hub in place. It is strictly a "safety" device to keep your wheel from coming off the tractor if the hub does come loose.

"Screaming" Noise coming from the engine area

The fan belt tension pulley has a sealed ball bearing in it. After several "billion" revolutions, the grease in the bearing disappears and the bearing starts screaming for mercy! After you replace the bearing, be careful that you don't over tighten the fan belt. This is a major cause of alternator and/or water pump failure.

Clutch is making loud Noise when I push the clutch pedal in

This information applies to "B" series tractors. This job is not for the "faint of heart". It will require "splitting" the tractor into two big "chunks" in order to get at the clutch. (Sorry). The "noise maker" is the clutch shaft pilot bushing that is mounted in the crankshaft. Something has occurred to wear it out. That "something" could be a bent adapter plate that is bolted to the back of the engine. Also there is a flex coupler at the rear of the pilot shaft that has some little steel balls in it that wear out over time. When this occurs, the shaft loses it's support at the rear causing an "oscillation" effect at the front end of the shaft. If the failure has progressed far enough, it may not be possible to install a new pilot bushing because the crankshaft itself is worn where the bushing resides. We have overcome this by having the flywheel machined to accept a sealed ball bearing. You will not find a bearing that is the same size as the pilot shaft, so be prepared to have the new pilot shaft machined to fit the bearing. This is not a Kubota approved repair, so proceed carefully and at your own risk! It's worth a try. Sure beats replacing the crankshaft! It is always a good idea to replace the pilot shaft and flex coupler assembly in the course of any clutch repair job.