Bearing 74550/74850 NACHI

Tapered roller bearings 74550/74850

Bearing number : 74550/74850

Size mm : 139.700x215.900x47.625

Brand : NACHI

Bore Diameter mm : 139.700

Outer Diameter mm : 215.900

Width mm : 47.625

Bearing dimensions and specification in brand catalogue :

d - 139.700 mm

D - 215.900 mm

T - 47.625 mm

B - 47.625 mm

C - 34.925 mm

a - -2.2 mm

r1 min. - 3.5 mm

r2 min. - 3.3 mm

Weight - 6,05 Kg

Basic dynamic load rating C - 320000 kN

Basic static load rating C0 - 565000 kN

Grease Lubrication Speed - 1500 r/min

Oil Lubrication Speed - 2100 r/min

Calculation factor e - 0.49

Calculation factor Y0 - 0.68

Calculation factor Y1 - 1.2

Bearing 74550/74850 NACHI Shielded bearings have a storage life of five years and a further two years operational life following installation. Wash all bearing parts with a noncontaminating solvent. Lightly pack the bearings with grease applying a 33% fill by volume into the bearing and housings. Where Bearing 74550/74850 NACHI space heaters are fitted, and the storage environment has wide humi dity and temperature variations, it is strongly recommended they be energised. Warnings should be placed on the Bearing 74550/74850 NACHI to make operatives aware of the live heaters Supplies are normally 220-240 volt single phase, from a 380-415 volt three phase supply. See terminal box lid for details.

Bearing 74550/74850 NACHI Shielded bearings have a storage life of five years and a further two years operational life following installation. Wash all bearing parts with a noncontaminating solvent. Lightly pack the bearings with grease applying a 33% fill by volume into the bearing and housings. Where Bearing 74550/74850 NACHI space heaters are fitted, and the storage environment has wide humi dity and temperature variations, it is strongly recommended they be energised. Warnings should be placed on the Bearing 74550/74850 NACHI to make operatives aware of the live heaters Supplies are normally 220-240 volt single phase, from a 380-415 volt three phase supply. See terminal box lid for details.

Insulation resistance During extended storage a three monthly insulation test is recommended to avoid possible lengthy drying out periods when installing Bearing 74550/74850 NACHI. Use a 500 volt d.c. Megger.The insulation resistance between phases and between the windings and the frame should be checked. The insulation resistance should be maintained above 10 megohm. If a lower reading is measured, use one of the drying out methods recommended on page 14 until an acceptable reading is obtained. If heaters are fitted but not energised, they should be used in future. Wound rotors Ideally, wound Bearing 74550/74850 NACHI brushes should not be in contact with the slip-rings during storage as there is a risk of corrosion. Brushes should either be lifted off the slip-rings or stored separately. This may not be possible with small Bearing 74550/74850 NACHI.

Insulation resistance During extended storage a three monthly insulation test is recommended to avoid possible lengthy drying out periods when installing Bearing 74550/74850 NACHI. Use a 500 volt d.c. Megger.The insulation resistance between phases and between the windings and the frame should be checked. The insulation resistance should be maintained above 10 megohm. If a lower reading is measured, use one of the drying out methods recommended on page 14 until an acceptable reading is obtained. If heaters are fitted but not energised, they should be used in future. Wound rotors Ideally, wound Bearing 74550/74850 NACHI brushes should not be in contact with the slip-rings during storage as there is a risk of corrosion. Brushes should either be lifted off the slip-rings or stored separately. This may not be possible with small Bearing 74550/74850 NACHI.