6
MAINTENANCE
The timing for maintenance of the pump is
established primarily on past performance. Each
installation is different. Therefore detailed
maintenance records of past performance can be
invaluable for determining future preventative
maintenance intervals. For motor maintenance
instructions consult the motor manufacturer.
CAUTION
Before performing any maintenance requiring
pump disassembly, be sure to flush and drain
pump/magnetic drive thoroughly with a
neutralizing fluid. Wear protective clothing and
handle equipment with proper care.
or otherwise abnormal operation, first refer to
the troubleshooting section. If the problem
cannot be resolved the pump must be
inspected for wear or damage. Isochem pumps
can be easily opened for cleaning and
inspection without disturbing piping connections
by removing the pump rear housing.
Where inspection shows wear, rebuilding the
pump using an Isochem KOPkit is strongly
recommended. Where pumps are equipped
with two metallic or plastic gears, replacement
with a new set is preferred. Pumps having a
metallic drive gear and plastic idler gear can
often be restored to original performance by
replacing the idler gear alone.
Note: Extended life bearings must be used
only with extended life shafts.
1. When changing a pump from one service to
another, be sure to check that all wetted parts
of the pump are compatible with the fluid to be
handled and that the motor is sufficiently
sized for the application. If in doubt contact
your Isochem representative.
2. All Isochem pumps transmit rotation from the
motor shaft to the pump shaft by means of a
magnetic drive coupling. The principle of
operation of the magnetic drive coupling is that
an encapsulated driven magnet assembly is
mounted on the end of the pump shaft. It is
then contained by a closed end "can" which
seals against the pump front housing with a
static Teflon O- ring. Then a drive magnet
assembly attached to an electric motor shaft
rotates around the containment can. When the
drive magnet assembly rotates, lines of
magnetic force cause the driven magnet
assembly to rotate which in turn causes the
pump shaft to rotate.
All magnetic drive couplings have a specific
maximum torque limit. If this torque is
exceeded the drive will decouple. Operation in
the decoupled mode should be avoided as high
temperatures could be generated.
3. Whenever gear pumps exhibit reduced flow
rates, inability to maintain pressures, noisy
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