3-2 Maintenance & Troubleshooting
MN605
Lubrication & Bearings
Bearing grease will lose its lubricating ability over time, not suddenly. The lubricating ability
of a grease (over time) depends primarily on the type of grease, the size of the bearing, the speed at
which the bearing operates and the severity of the operating conditions. Good results can be obtained if
the following recommendations are used in your maintenance program.
Type of Grease
A high grade ball or roller bearing grease should be used. Recommended grease for standard
service conditions is Polyrex EM (Mobil).
Equivalent and compatible greases include:
Texaco Polystar, Rykon Premium #2, Pennzoil Pen 2 Lube and Chevron SRI
−
2.
−
Maximum operating temperature for standard motors = 110
°
C.
−
Shut
−
down temperature in case of a malfunction = 115
°
C.
Lubrication Intervals
Recommended lubrication intervals are shown in Table 3-2. It is important to realize that the
recommended intervals of Table 3-2 are based on average use.
Refer to additional information contained in Tables 3-3 and 3-4.
Table 3-2 Lubrication Intervals *
NEMA / (IEC) Frame Size
Base Speed - RPM
>2500
1750
1150
<800
Up to 210 incl. (132)
5500 Hrs.
12000 Hrs.
18000 Hrs.
22000 Hrs.
Over 210 to 280 incl. (180)
3600 Hrs.
9500 Hrs.
15000 Hrs.
18000 Hrs.
Over 280 to 360 incl. (225)
* 2200 Hrs.
7400 Hrs.
12000 Hrs.
15000 Hrs.
Over 360 to 500 incl. (300)
*2200 Hrs.
3500 Hrs.
7400 Hrs.
10500 Hrs.
* Lubrication intervals are for ball bearings. For roller bearings, divide the listed lubrication interval by 2.
Table 3-3 Service Conditions
Severity of Service
Ambient Temperature
Maximum
Atmospheric
Contamination
Type of Bearing
Standard
40
°
C
Clean, Little Corrosion
Deep Groove Ball Bearing
Severe
50
°
C
Moderate dirt, Corrosion
Ball Thrust, Roller
Extreme
>50
°
C* or
Class H Insulation
Severe dirt, Abrasive dust,
Corrosion
All Bearings
Low Temperature
<-30
°
C **
All Bearings
*
Special high temperature grease is recommended (Dow Corning DC44). Note that Dow Corning DC44 grease does
not mix with other grease types. Thoroughly clean bearing & cavity before adding grease.
** Special low temperature grease is recommended (Aeroshell 7). Different brushes may also be required.
Contact your local Baldor district office or an authorized Baldor service center for technical assistance.
Table 3-4 Lubrication Interval Multiplier
Severity of Service
Multiplier
Standard
1.0
Severe
0.5
Extreme
0.1
Low Temperature
1.0
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