ATURIA TK, Instruction Manual

Page: 13 / 32

LTK0E01D 05/2017
13
C
C
H
H
A
A
P
P
T
T
E
E
R
R
6
6
MAINTENACE
6.1 Ordinary Maintenance
Once started the pump, check it as frequently as possible by means of plant instruments like pressure
gauges, vacuum meters and ammeters. The pump needs normally no maintenance, except a periodical
check to:
- Seal operation (either mechanical or packing)
- Bearing operation
- Periodical renew of lubricant grease in bearings
PACKING SEAL
The quantity of leakage of medium should be sufficient to ensure correct cooling and lubrication of the
packing and shaft sleeve; generally 30-60 drops a minute is correct.
If necessary vary the quantity by adjusting the packing follower and, if fitted, check for a correct flow of the
flushing connections. If this adjustment has no effect, all the packing rings should be replaced. If also the
shaft sleeve is worm it should be replaced.
The number and dimensions of new packing rings must be the same of the original.
Replace the packing whenever needed.
Size and quality of the new packing must absolutely suit the service.
It is important to replace all the packing and not only those at the ends.
To replace the packing, remove the gland and then the packing with a flexible extractor, available by seals
manufacturers. Do not over tighten the packing. as that will cause their immediate failure.
Check shaft sleeve: it should be smooth also under the packing. If the sleeve is scratched or shows any sign
of surface roughness, it should be machined again or replaced according to the situation.
MECHANICAL SEAL
During the first running hours the mechanical seal can have small leak but after no leaks should be occur.
The mechanical seal must be checked every 4.000 hours running; in case of leakage check the seal faces
and the seal shaft sleeve that must be perfectly smooth, especially on O-Ring contact zone.
If it is worn it should be replaced.
LUBRICATION
It is very important to check the bearing operation, their temperature and the level.
Check bearing housing temperature: it can raise up to 50°C above the ambient temperature, but it should
never exceed 90°C.
Bearings are grease-lubricated. Every 2,000 running hours, 5-10 grams of grease (depending on the size of
the pump) has to be let in through the grease nipples. Use grease lithium SKF 65-2 or similar.
Replace the bearings only if they are noisy.