Bearing demolition and installation of the same carefully. Note that no damage to TIMKEN bearings and parts, especially the interference with the disassembly of the bearing, the operation is difficult. So, at the design stage to be considered in advance to facilitate the demolition, demolition tools required design is also very important. Demolished, according to the drawing research and demolition methods, sequence, and investigated the co-ordination conditions in order to obtain the demolition job foolproof.

Demolition of interference fit of the outer circumference of the shell in advance to set several outer extrusion screw with a screwdriver, side equally tighten the screw, while the demolition. These screw holes are usually covered with blind plugs, separation of bearings, tapered roller bearings in the housing block on the shoulders to set up a few incisions, the use of pads, use press demolition, or tapping the demolition.

The demolition of the inner pressure mechanical pull out the latest simple. At this time, pay attention to the inner ring to withstand the pulling force.

Large bearing inner ring disassembly hydraulic method. Oil pressure through the hole in the shaft, so that easy to pull. The width of TIMKEN bearings hydraulic drawing fixtures and the demolition job.

NU-NJ type cylindrical roller bearing inner ring disassembly by induction heating. Local heating in a short period of time, so that the inner expansion after drawing.

The demolition of the small band tight sleeve bearings, the file block support inner fastening to the shaft, the nut back several times, use the pad with a hammer to beat the demolition.

Large bearings, the use of hydraulic demolition easier, sending oil pressure in the tapered bore axis of the hole, so that the inner expansion, the demolition of the bearing. Operation, the bearing may suddenly emerge, best use the nut as a file block as well.

TIMKEN bearing raceways or rolling surface, under alternating load effect of the surface metal of the contact surface was exfoliated, and gradually expand the formation of pits. Continue to operate, will form an area of ??flaking region. Due to improper installation or the local area will enable the bearing of the centerline of the bearing bore and shaft tilt reason to bear a greater load to early fatigue failure.

Material defects and improper heat treatment, with the amount of interference is too large, the combination of poorly designed, such as the bearing surface grooves caused by the stress concentration, etc., will form a ring crack and fracture.

Outside durum substances into TIMKEN bearings, and pressure between the rolling element and raceway to the scroll formed on the surface of the indentation. In addition, too much impact load can make the contact surface produce localized plastic deformation and the formation of pits. When the bearing is stationary, even if the load is small, due to the vibration of the surrounding environment will also be uniformly distributed pits formed in the raceway.

Rolling sealed well, so that dust or particulate matter from entering the bearings, or poor lubrication will cause more serious contact surface scratches or wear, and bearing vibration and noise increase.
Current through the bearings, will produce a small spark, resulting in contact with the surface partial annealing pits or black bright spot. In serious condition into the larger pit.

Water or acids, alkalis, salts and other invasive bearings or lubricants, improper selection of the reference bearing corrosion, precision bearings, even if slight corrosion will also allow the bearing scrap.

TIMKEN bearings, especially high-speed bearings, cage and rolling element contact or ring at the wear, due to lack of lubricant, so that collision, and even lead to cage fracture.



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