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KAH Operation & Maintenance Guide
Page: 46 of 88
SECTION 3 - MAINTENANCE (CONTINUED)
If the AHU is equipped with a grease plug, use the following instructions to replace the grease:
1. Be sure that the grease you are adding to the motor is compatible with the grease already in the motor. Consult a
distributor or an authorized service center if grease other than the recommended type is to be used.
2. Clean all grease fittings.
3. Remove the grease relief plug.
4. If motor is stopped, add the recommended amount of grease.
5. If the motor is to be greased while running, add a slightly greater quantity of grease slowly until the new grease
appears at the shaft hole in the end plate or relief plug hole.
6. Clean off any grease from the grease fitting.
7. Run motor for 15-30 minutes with the relief plug removed to warm up the grease.
8. Wipe off any grease that was pushed out of the relief plug.
9. Reinstall the grease relief plug.
SEVERITY OF SERVICE
MULTIPLIER
Standard
1.0
Severe
0.5
Extreme
0.1
Low Temperature
1.0
TABLE 14 - MOTOR BEARING LUBRICATION INTERVAL MULTIPLIER
NEMA / (IEC) FRAME SIZE
RATED SPEED - RPM (HOURS)
10,000
6,000
3,600
1,800
1,200
900
UP TO 210 INCL. (132)
**
2,700
5,500
12,000
18,000
22,000
OVER 210 TO 280 INCL. (180)
-
-
3,600
9,500
15,000
18,000
OVER 280 TO 360 INCL. (180)
-
-
*2,200
7,400.
12,000
15,000
OVER 360 TO 5800 INCL. (180)
-
-
*2,200
3,500
7,400
10,500
TABLE 12 - MOTOR BEARING LUBRICATION INTERVALS
*
Lubrication intervals are for ball bearings. For roller bearings, divide the listed lubrication interval by 2.
Relubrication interval for 6205 bearing is 1550 hrs, and for 6806 bearing is 720 hrs. (Using grease lubrication)
**
For 6205 and 6806 bearings. For 6807 bearings, consult oil mist lubrication (MN410).
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
All Bearings
Low Temperature
<-30°C**
Corrosion
-
TABLE 13 - MOTOR BEARING SERVICE CONDITIONS
*
Special high temperature grease is recommended. Note that high temperature grease may not mix with other grease types.
Thoroughly clean bearing and cavity before adding grease.
**
Special low temperature grease is recommended.
