Industrial Bearing Maintenance Manual

As WARNING Failure to observe the following warnings could create a risk of serious injury. Proper maintenance and handling practices are critical. Failure to follow installation instructions and to maintain proper lubrication can result in equipment failure. Never spin a bearing with compressed air. The rolling elements may be forcefully expelled. As CAUTION Failure to observe the following cautions could create a risk of injury. Do not attempt to disassemble unitized bearings. Remove oil or rust inhibitor from parts before heating to avoid fire or fumes. If a hammer and bar are used for installation...

index a Timken - Where You Turn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 b General bearing handling and inspection . . . . . . . . . . . . . . . 9 c internal Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 d Shaft and housing requirements . . . . . . . . . . . . . . . . . . . . . . . . 31 e Shaft and housing tolerances abma Standard 7 . . . . . . . 37 f Tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 g spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . ....

A Ti m ke -W he re Yo uT urn A n a Timken - Where You Turn

TIMKEN - WHERE YOU TURN TIMKEN - WHERE YOU TURN Maintenance professionals around the world turn to Timken to help improve the performance and extend the life of their equip- ment. The information in this manual will help you follow proper in- dustrial maintenance practices to get the most out ofyour Timken products and the equipment in which they operate. You will find practical information describing how to install, adjust, lubricate and maintain all of the primary types of anti-friction bearings. We have also included additional information on maintenance tools ENGINEERING EXPERTISE Timken...

al b be ar in gh an d lin g b General bearing handling and inspection General Bearing Handling And Inspection. . . . . . . . . . . . . . . . 11 . Bearing Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Removing Bearings From Equipment. . . . . . . . . . . . . . . . . . . . . . 12 Damaged Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

GENERAL BEARING HANDLING AND INSPECTION GENERAL BEARING Bearings are a vital component in major industrial equipment. Bearing problems can result in costly downtime, equipment dam- age and breakdowns. In addition, large industrial bearings repre- sent a significant capital investment. To attain reliable operation with high equipment performance and the lowest possible maintenance costs, it is essential to follow proper handling practices. This includes bearing storage, removal, cleaning, inspection and installation. The useful life of any bearing depends to a great extent on the care and maintenance...

GENERAL BEARING HANDLING AND INSPECTION REMOVING BEARINGS FROM EQUIPMENT Each type of bearing design has a unique removal process. Regardless ofthe bearing type, the bearing must be removed with extreme care. If done incorrectly, you can damage the bearings, shafts or housings, requiring expensive repairs. For smaller bearings, there are a variety of pullers available to as- sist with bearing removal (Fig. 1). Information concerning special pullers or other removal devices can be obtained by contacting yourTimken representative. Fig. 1 Pullers for bearing removal For bearings installed with a...

GENERAL BEARING HANDLING AND INSPECTION Fig. 4 Tanks are heated with electric coils and a pump is used to Fig. 3 Smaller bearings can be cleaned in a wash tank agitate the cleaning solution A WARNING Failure to observe the following warnings could create a risk of serious bodily harm. Proper maintenance and handling practices are critical. Failure to follow installation instructions and to maintain proper lubrication can result in equipment failure. Never spin a bearing with compressed air. The rolling elements Alkali cleaners, such as trisodium phosphate (TSP) mixed two or three ounces per gallon...

GENERAL BEARING HANDLING AND INSPECTION between face of bearing bearing seat Fig. 5 It is important to check for burrs on the inner and outer ring seats and backing surfaces In addition to examining the bearing, a full inspection should in- clude the housing and shaft. Check for burrs or metal chips on the inner and outer ring seats and backing surfaces (Fig. 5). Burrs or chips can be removed by scraping or filing the damaged Inspect the shaft for proper size, roundness, burrs or other dam- age. A 12-point check of the shaft with a micrometer is suggest- ed (see page 33). If there is evidence...

GENERAL BEARING HANDLING AND INSPECTION Fig. 6 Bearings can be heated in a pan or metal container filled Thoroughly clean all machine components near where the bearing will be installed, giving special attention to the mounting surfaces and housings. Housings should be cleaned, including blowing out the oil holes. If the equipment has blind holes where air is ineffec- tive, use a magnetic rod to remove metal chips that might have become lodged there during machining or maintenance. Shaft surfaces that will support and contact the bearing must be clean and free from nicks or burrs. Shaft shoulders...

GENERAL BEARING HANDLING AND INSPECTION A CAUTION Failure to observe the following cautions could create a risk of injury. If the bearing is to be reused or returned for repair, do not use heat from a torch. Extreme heat from a torch can alter the bearing hardness and metallurgical structure, resulting in irreparable damage. Keep the bearings away from any localized high-heat source that may raise the bearingtemperaturetoo high, resulting in race hard- ness reduction. When heating bearings, be sure thatthey have enough time to ful- ly heat. Bearings typically require 20 to 30 minutes of soak...