PEER Agricultural Catalog - PEER Bearing - (Version JPG) - Page n° 19 - PDF Catalogue | Technical Documentation

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Bearing, Roller bearing, Seal, Bearing unit, Radial ball bearing

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ENGINEERING INFORMATION

GREASE:

Grease is a popular form of lubrication used in ball bearings. Greases are composed primarily of three components, base oil, thickener and additives.

-Base oil: Provides virtually all the lubrication function of the grease. •Mineral •Synthetic

-Thickener: Acts as a sponge for the base oil.

•Soap: lithium, calcium, sodium

♦Non-soap: polyurea, silica gel -Additives: Improves desired properties of a grease.

•Rust inhibitors

•Anti-oxidants

The consistency of a grease is described by its NLGI* number. The NLGI number of a particular grease is determined using a standard worked penetration test. Table 2 gives relative consistencies of ball bearing greases based on NLGI numbers.



	1	Very soft
	2	Soft
	3	Semi-firm
	4	Firm

Table 2: Relative grease consistency based on NLGI number.

*National Lubricating Grease Institute

PEER bearings are pre-lubricated with high quality grease suitable for a wide variety of applications, speeds, temperatures and environments. Special greases are readily available. Shown in Table 3 is a sample of the standard and special greases offered.


Product Name	Shell Alvania RL #2	Shell Alvania RL #3	Mobil Polyrex EM	Exxon Unirex N 2
Color	Amber	Amber	Blue	Green
Thickener Type	Lithium	Lithium	Polyurea	Lithium-complex
Oil Type	Mineral	Mineral	Mineral	Mineral
NLGI number	2	CO	2	CM
Base oil viscosity	98	98	115	115
Typical operating temperature	-20 / 250 °F	-10/250 °F	-10/320 °F	-20 / 300 °F
Dropping point	385°F	385°F	550°F	437°F
PEER grease code	L15	L16	L151	L05

Table 3: Grease properties

PEER Agricultural Catalog - PEER Bearing - #19

Bearing, Roller bearing, Seal, Bearing unit, Radial ball bearing