Page 571 - SKF-bearing-housings

Lubrication

Lubrication Relubrication
Relubrication is possible via two G 1 /4 or G 1 /8
Standard PD two-bearing housings are grease fittings (depending on size), one on
designed for grease lubrication. Housings for each end of the housing († fig. 10). There is
oil lubrication are available on request. minimal risk of over-greasing because excess
The lubricant should be selected based on grease is collected in the large space in the
the operating conditions of the bearings. For middle of the housing. When applying grease
additional information about lubricant selec- via the grease fittings, the shaft should be
tion, refer to the product information available rotating.
online at skf.com. SKF recommends replenishing the housings
with SKF LGMT 2, a high-quality mineral oil
based grease with a lithium thickener and
Flinger rings good rust inhibiting properties. For vertical
PD housings are supplied with inboard flinger shaft arrangements, SKF LGMT 3 grease
rings made of grey cast iron († fig. 9). The should be used with half the interval required
flinger rings serve to retain grease at the for a similar horizontal application.
bearing position and to prevent over-lubrica- To calculate the relubrication interval and
tion. The excess grease is collected in the large the quantity of grease needed for replenish-
space in the middle of the housing. ment, refer to the SKF catalogue Rolling bear-
ings or skf.com/bearings.
Initial grease fill
If no other requirements exist, the free space Oil lubrication
in the bearings should be completely filled with Where high speeds preclude the use of grease
grease and the free space between the cover as a lubricant, large PD housings can be modi-
and flinger ring should be filled to 100%. fied for oil bath or circulating oil lubrication
systems. The housings are fitted with special
Initial grease fill for PD units oil seals. For additional information, contact
PD units are greased at the factory with SKF the SKF application engineering service.
LGMT 2, a high-quality mineral oil based
grease with a lithium thickener and good rust
inhibiting properties. The operating tempera-
ture range of the grease is –30 to +110 °C
(–20 to +230 °F).
12
Fig. 9 Fig. 10

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