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Check local temperature, slow down and rectify,

Check the lubrication level, check for metal in oil, oil pressure

Check the shoes,

Reasons:

• Not enough lubrication Improper lubricant selection
• Inadequate lubricant supply
• Interrupted fluid film
• Insufficient bearing clearance
• Excessive load
• Over speed
• Harsh operating environment

 

Clearance

allow formation of an oil film in the wedge shape between the collar and the thrust pads 

pads are prevented from overheating and premature wear by fluid film of oil between them and collar,

This clearance is also needed to allow for expansion as parts 

Depends on dimensions of pads, speed, thrust load and the type of oil employed.

 High bearing temperature, power loss and failure can result if axial clearance is too small.

The accepted method of checking thrust clearance, involves jacking the shaft to the end of its travel in one direction and then back to the limit of travel in the other.

Total movement of the thrust shaft (about 1 mm being typical) is registered on a dial gauge. Feelers can be used as an alternative, between thrust ring and casing. 

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