Drive-End Bearing Heats Up

Check the alignment

What is the type of coupling you are using ?

Ensure there is sufficient axial clearance (as recommended) in the coupling and the balancing of the system.

The Motor DE bearing is the one which has to absorb maximum of the load un-balance and the thrust. Eliminate those

Alignment is your biggest concern and the proper coupling. I've also seen techs use the wrong length bolt (as per the others) because he was too lazy to go to stock and get matching sizes. (after loosing one) and throwing off the balance. Wasn't a good idea.

If only the motor was replaced check for wear in the pump. Bearings, bushings, shims, etcetera. Torque to specs and test again.

Quickly put the two most common causes will be;

1-Alignment/Coupling issues (self explanatory)

2-Lubrication issues (its important to remember over lubrication will overheat and damage bearings as well as insufficient lubrication)

Define "heat up" please note temp rise on BOTH ends in a reply for a more informed answer.

check alignment,

use flexible type coupling,

install journal bearing on the other motor DE,

check for vibrations (maybe)

,This is further to good advices posted, Your inputs doesn't specify what type of bearings it is i assume it is Ball bearings and suggest check the Clarence specified on the original bearing it will be marked along with Bearing Number followed by C1,C2,C3.C4 etc this is the Clarence between the Balls and outer race of the ball bearing for specific application, by machinery manufacturer based on Operating temperature of your machine bearings approach your machines Ball bearing manufacturer or his Technical Rep who will give you right advice.

crm

Hello All,

I have managed more than 10 Years the filed services of a slide bearing maker - and have seen/handled many suffering bearings: any understanding of a problem is based on the quality of related information.

At this point I would join in the previous comment: the CR4 community is missing any useful information/observation except the fact, a DE-bearing does generate abnormal heat. No info about the bearing technologie and possible type (bearing probably equipped with a makers tag), the operational conditions (speed, journal size, lubrication, lubricant, coupling type and principle - all these essential data are available at site without special efforts for deriving them.

Sorry, but leave us a chance for thinking about the problem instead poking around in the space of possible effects, thus you and we have an advantage from spending our time in CR4.

Please come up with mentioned information - or contact the motor maker directly.

I guess we're all assuming the OP would know the normal operating temperature variances. I at least assumed he was experiencing abnormal ranges and was aware of this. If the motor bearings were replaced improperly that would also cause higher temps. That along with not removing grease plugs before greasing and overfilling race. Could be quite a few reasons for overheating. We're just stating the most common. If he had the equipment (both audible and thermal imaging) he could find the problem post haste.

Pull the motor and replace both bearings. Make sure they are packed or coated with lube right after you take them out of the box. Pull the coupling and make sure the shaft is aimed at the center of the motor shaft the carefully (shim if needed) reinstall everything making sure to check the motor rotation before installing it on the coupling.

Run the pump for a couple of hours and record the bearing temp on bith bearings and write it down and file it somewhere and write it on the motor.

Don't screw with a bearing that heats up. It could cause seripous damage to everthing.

You really need to watch how you reply in most cases. Although you might take for granted that a "aimed" shaft may include both axle and parallel alignment, the original poster might not.

This also goes for packing the bearings. ( how much and what type )

Please don't take this as an insult, its just a little constructive criticism between friends.

Geeeehh! I will install a "Heat Sink Collar" to it. This way it will disipate the extra operation heat product. Or probably by direct an spray mist of water and glycol solution direct to the "Heat" area, just enougth to avoid from overheating. This solution will be run by an small pump and recirculate it for continuous use during machining operations. Keep it running! There ya' go!!!!!!!!!!!!!!!!!!!!!!

Keep it Cool,

MC

Aside from alignment issues,lubrication and dirt may be a problem. The number one cause of premature bearing failure is over lubrication.If the bearing has a grease fitting,make sure the drain plug on the opposite side is removed and the motor run in for at least 5 minutes after lubing.If the grease has no place to go, it will churn between the bearings,causing excessive heat and premature bearing failure. good luck HTRN

Hi

1)Why don't you check the concentricity of the Bearing housing bore

2) Coupling and motor - Alignment

3) concentricity of motor prime mover shaft

4) The Bearing at this end should be a Cyl Roller N type with C3 Clearance - with High Temp Grease - what cage material are you using J - Steel or B - Brass

Rgds

Doug