Bearing 4T-HM88542/HM88510 NTN

Tapered roller bearings 4T-HM88542/HM88510

Bearing number : 4T-HM88542/HM88510

Size mm : 31.75x73.025x29.37

Brand : NTN

Bore Diameter mm : 31,75

Outer Diameter mm : 73,025

Width mm : 29,37

Bearing dimensions and specification in brand catalogue :

d - 31,75 mm

D - 73,025 mm

T - 29,37 mm

B - 27,783 mm

C - 23,02 mm

ra1 max. - 3,3 mm

a - 6 mm

Da - 59 mm

db - 42,5 mm

ra max. - 1,3 mm

da - 45,5 mm

Db - 70 mm

Weight - 0,622 Kg

Basic dynamic load rating C - 72 kN

Basic static load rating C0 - 97 kN

Grease Lubrication Speed - 5 400 r/min

Oil Lubrication Speed - 7 100 r/min

Calculation factor e - 0,55

Calculation factor Y0 - 0,6

Calculation factor Y2 - 1,1

Bearing 4T-HM88542/HM88510 NTN 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 4T-HM88542/HM88510 NTN 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 4T-HM88542/HM88510 NTN 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 4T-HM88542/HM88510 NTN 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 4T-HM88542/HM88510 NTN 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 4T-HM88542/HM88510 NTN 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 4T-HM88542/HM88510 NTN. 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 4T-HM88542/HM88510 NTN 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 4T-HM88542/HM88510 NTN.

Insulation resistance During extended storage a three monthly insulation test is recommended to avoid possible lengthy drying out periods when installing Bearing 4T-HM88542/HM88510 NTN. 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 4T-HM88542/HM88510 NTN 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 4T-HM88542/HM88510 NTN.

Insulation resistance During extended storage a three monthly insulation test is recommended to avoid possible lengthy drying out periods when installing Bearing 4T-HM88542/HM88510 NTN. 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 4T-HM88542/HM88510 NTN 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 4T-HM88542/HM88510 NTN.