Ball Bearing Housed Unit Page A-22 Ball Bearing Housed Units-Engineering

A-22 TIMKEN BALL BEARING HOUSED UNIT CATALOG Download 3D Models and 2D Drawings at cad.timken.com BALL BEARING HOUSED UNITS INSTALLATION Ball bearing housed units are available in a wide variety of types and sizes to accommodate a complete range of operating conditions. These units generally have cast-iron housings and are designed for mounting on straight shafts with a slip fit. The self-locking collar and the set screw inner bearing design provides ease in mounting. 1. Ensure that the shaft is clean, free from burrs, straight and of proper diameter. The bearing should not be mounted on a worn section of the shaft. Using shafts with hardness greater than HRC 45 will reduce effectiveness of locking devices. See table A-15 on page A-23 for recommended shaft tolerances. 2. Align the bearing in its housing and slide the unit into position on the shaft. 3. Bolt housing tightly to its mounting supports using an appropriately sized fastener (table A-17 on page A-23). Flat washers should be used when installing any kind of housed unit. Washers should be properly sized to bolt diameter and should not be an SAE grade, which is smaller. BALL HOUSED UNITS MAY BE LOCKED INTO POSITION ON SHAFTS USING EITHER OF THE FOLLOWING METHODS 4. Eccentric locking-collar bearings: Slide collar over cammed end of inner ring. Rotate collar to engage cams and lock by lightly tapping with drift pin in the direction of shaft rotation. Tighten set screw to recommended torque levels as shown in table A-16 on page A-23. In cases where the units are mounted vertically or where they are to assume considerable thrust loading, the unit should be placed so that the collar is forced against the inner ring by the thrust rather than away from it. In these cases, it may be advisable to spot the shaft under the set screw. To disassemble, loosen set screw and lightly tap collar in direction opposite shaft rotation. 5. set screw locking bearings: Lock bearing to the shaft by tightening each inner ring set screw incrementally to recommended torque levels as shown in table A-16 on page A-23. For concentric collar units, tighten each collar set screw to recommended torque levels in tables. To disassemble, loosen set screw. INSTALLATION PROCEDURE FOR HIGH-SPEED OR HIGH-TEMPERATURE SAL/SAOL BEARINGS 6 a. Remove housing cover gasket, bearing, spacer ring, endplates and packings. Use care when handling gasket and packings. Slide housing and one endplate along shaft. Ensure that the overflow cup, located at the base of the pillow block, is placed on the downward side of shaft rotation. Slide bearing onto shaft and into housing, with cam side outward (facing open end of housing). fixed mounting: Position bearing against housing shoulder and place spacer ring between bearing aligning ring face and housing cover shoulder face. float mounting: Position bearing in center of its floating space between housing and housing cover shoulder faces. Do not use spacer ring. In general, it is preferable for the fixed bearing to be closest to the drive position. b. Follow step 4 or 5 on this page to secure bearing to shaft. c. Replace gasket and housing cover. d. Install packings and endplates. Tighten screws holding endplates to force packings into contact with shaft. This creates an effective seal. e. To disassemble, reverse the above operations to remove bearing from the shaft. Failure to observe the following warnings could create a risk of death or serious injury. Proper maintenance and handling practices are critical. Always follow installation instructions and maintain proper lubrication. WARNING NOTE Do not overtighten packings. If considerable heat develops during operation, loosen packings by loosening the screws holding endplate.

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