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5.8. Clearing a blockage
When the impeller cannot turn freely anymore,
the pump must be switched off and the valves
on the suction and the pressure side must be
closed. Let the pump return to ambient tem-
perature, empty, take out of the piping system
and decontaminate if necessary. Disassemble
the pump casing according the disassembly
instructions in chapter 8. Remove the source of
the blockage and reassemble the pump casing.
Before reinstalling the pump back into the piping
6. Maintenance, spare parts and cleaning
6.1. Maintenance of the motor
Smaller motors are equipped with bearings
greased for life and need no maintenance.
From frame size 180 onwards (from 22 kW on
3000 rpm or 18.5 kW on 1500 rpm) motors are
equipped with grease nipples for greasing the
bearings. For some motor brand names, the fre-
quency of greasing is indicated on the nameplate
of the motor and must be followed. For motors
where this is not mentioned, it is best to grease
every 2000 operating hours when the ambient
temperature is 25°C. If the ambient temperature
is 40°C, the interval must be halved.
6.2. Mechanical seal
Check the mechanical seal for leakage every
week. When starting up a new pump, a few drops
of liquid leakage per hour are possible because
the seal surfaces need to be run in. This leakage
should fully disappear after ten operating hours.
In case of any damage to the mechanical seal,
it should always be replaced, both the station-
ary part, rotating part and rubber parts. When
opening the pump casing, the pump casing seal
should also be replaced at the same time.
In order to replace the seals, clean the stainless
steel pump parts.
system, check with your hand in the inlet of the
pump, (for MSP types: on the ventilator of the
motor) that the impeller is free to rotate in the
pump housing. If this is not the case, the pump
must be completely disassembled and checked
for any damaged components, which must then
be replaced by original Packo parts. When the
cause of the blockage has been found and is pre-
vented for the future, try again to assemble the
pump according to the instructions in chapter 8.
For pumps on a pedestal with an oil bath, check
the level of the oil once a week. Change the oil
after 3000 operating hours and at least once
a year. The grease in the pedestal bearings
cannot be changed as they are sealed for life
with a lifetime expectancy of about 20000
operating hours. This value is only an indica-
tion. The best option is to replace the bearings
when they seem to be worn (signs of wear are
noise, vibrations,...).
For ATEX pumps with single mechan-
ical seal, the seal has to be replaced
at least after 3000 operating hours
(see chapter 2.4)
For pumps with quench, check, and regulate if
necessary, the flow of the quench fluid every
week.
For pumps with a quench reservoir, check the
level in the reservoir every week. Add liquid if
necessary.
For VDK pumps with mechanical seal in an oil
bath, check the level in the oil bath weekly and
add liquid if necessary. Change the oil bath every
3000 operating hours and at least yearly.
89
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