EBARA EFQT3 - Manual (Page 18)

EBARA Fluid Handling 18
Checking bearing temperatures by hand is
inaccurate. Bearing temperatures can be
measured accurately by placing a contact-
type Thermometer against the housing.
Record this temperature for future reference.
A sudden increase in bearing temperature is
a warning that the bearings are at the point
of failing to operate properly. Make certain
that the bearing lubricant is of the proper
viscosity and at the correct level (see
LUBRICATION in MAINTENANCE AND
REPAIR).
Bearing overheating can also be caused by
shaft misalignment and/or excessive
vibration.
When pumps are first started, the bearings
may seem to run at temperatures above
normal. Continued operation should bring
the temperatures down to normal levels.