6.1.3.3 Oil Level Control
If the level of oil in the bearing housing (134C) is too high, excessive heat may be generated due to
churning. If the level is too low, excessive heat may be generated due to inadequate lubrication. A liquid
level switch connected to the oil sump can be used to warn of a dangerous oil level condition.
Observe the oil level requirements shown on the assembly drawing furnished with the pump. If excessive
heat is experienced within these levels, consult the factory. Be sure that the shaft centerline is horizontal
through the bearing housing.
6.1.3.4 Normal Bearing Temperature
The running temperature for a bearing assembly depends on many factors such as speed, bearing
loads, lubrication, ambient air temperatures, and condition of bearings. Temperatures higher than the hu-
man hand can tolerate are very satisfactory for good bearing operation and should not cause any alarm.
For a given speed and loading, the bearing housing temperature will stabilize at some temperature, usu-
ally below 200°F (93°C), which will be the normal temperature for the installation. Higher temperatures
than this normal temperature, without any change in speed or loading can mean a lubrication difficulty or
the approach of bearing failure.
6.1.4 Shaft-seal maintenance
6.1.4.1 Mechanical-seal maintenance
WARNING:
The mechanical seal used in an Ex-classified environment must be properly certified.
CAUTION:
Running a mechanical seal dry, even for a few seconds, can cause seal failure and physical
injury. Never operate the pump without liquid supplied to the mechanical seal.
Cartridge-type mechanical seals
Cartridge-type mechanical seals are commonly used. Cartridge seals are preset by the seal manufactur-
er and require no field settings. Cartridge seals installed by the user require disengagement of the hold-
ing clips prior to operation, allowing the seal to slide into place. If the seal has been installed in the pump
by ITT, these clips have already been disengaged.
Other mechanical seal types
For other types of mechanical seals, refer to the instructions provided by the seal manufacturer for instal-
lation and setting.
Reference drawing
The manufacturer supplies a reference drawing with the data package. Keep this drawing for future use
when you perform maintenance and seal adjustments. The seal drawing specifies the required flush fluid
and attachment points.
Before you start the pump
Check the seal and all flush piping.
6.1 Maintenance
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Model AF (42"/1200mm/54"/60"/66") LM/LMR Bearings Installation, Operation, and Maintenance Manual