1. Maximum fill
2. Minimum fill
Figure 20: Recommended sight glass oil level
– Add oil if the oil level is at or below the minimum fill line. Drain excess oil from the
bearing cavity if the oil level is at or above the maximum fill line. Operating the
pump at oil levels outside of the indicated range will cause bearing damage.
Change the oil during routine maintenance to remove dirt and debris from the
bearing cavity. For more detailed lubrication instructions, refer to Lubricate the
bearings on page 39.
– In installations with moderate temperature changes, low humidity, and a clean
atmosphere, the oil should be changed after 1000 hours of operation. Conditions
may permit extended oil change periods anywhere from an additional 200-4000
hours. Inspect the oil frequently for moisture, dirt, or signs of breakdown especially
during the first 1000 hours of operation.
Bearing operating temperatures
The maximum operating temperature for ball bearings should not exceed 250°F (121°C).
If the temperature inside the bearing housing rises above this limit, shut down the pump
and determine the cause. Use the appropriate and properly calibrated equipment, such
as RTDs or thermocouples, when obtaining measurements
Note: Hand-held infrared thermometers are not recommended for accurate temperature
measurements of bearings or the bearing housing. IR measurements are highly sensitive
to surface properties, measurement distance, humidity, and proper emissivity calibration.
Furthermore, IR thermometers will only provide the surface temperature of the bearing
housing. Conditions inside the bearing housing may be hotter than the surface
temperature indicated by an IR thermometer
Coupling lubrication
Coupling type Lubrication requirements
Grid couplings Grid or gear tooth couplings (Falk Grid Steelflex or Falk Crowned Tooth
coupling for instance) are initially lubricated with Falk Long Term Grease
(LTG) and do not require relubrication for up to three years. If coupling leaks
grease, or is exposed to extreme temperatures or excessive moisture, more
frequent lubrication may be required.
Use coupling manufacturer’s recommended grease to provide trouble free
performance.
Polymer and elastomeric element-
type
Polymer and elastomeric element-type couplings are maintenance-free and
do not require lubrication. If other types of couplings are used, follow
maintenance instructions of coupling manufacturer.
6.2.1 Lubricate the bearings
Grease lubrication
Before you begin this procedure, make sure that you have these items:
6 Maintenance
e-XC INSTRUCTION MANUAL 39
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