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Service intervals
The intervals for inspection and replacement of wear
parts vary greatly with the properties of the pumped
liquid and can only be determined by experience. All
internal parts of the ACF/UCF-pump are lubricated by
the pumped liquid.
Pumping liquid which contain abrasive materials, or
liquid that is corrosive, will significantly reduce service
life and call for shorter service intervals.
Wear in the pump will normally show as:
▪
Vibration
▪
Noise
▪
Loss of capacity
▪ Reduction in flow/pressure
• Leakage
We recommend planned inspection and overhaul at
regular intervals, not exceeding 3 years.
It is recommended to always have the spares included
in minor spare part kit G053 available for a planned
inspection.
Inspection of rotors
To reach the idler rotors in a quicker way than described
in the dismantling section, loosen the rear cover (480)
with valve. Screw out the idler rotors backwards. Inter-
nal clearances in the pump, which are vital for its proper
function, may have been affected by wear. Acceptable
wear can be determined only by experience of the
actual application. As a rule of thumb the following max
clearance values may apply: Between rotor and bores:
0.2 mm, Between rotor flanks: 0.4 mm For light duties
(low pressure, medium viscosity) even bigger clear
-
ances may be acceptable but for low visc./high pres-
sure duties the limit will be lower. Also watch if there are
major scratches on these parts.
Inspection of shaft seal
As the seal faces of a mechanical shaft seal are
lubricated by the fluid a certain leakage will always
be present. Ten drops per hour can be considered as
acceptable. An external visual inspection of the pump
is advisable at least every two days to assure that the
shaft seal is not leaking too much.
Excessively leaking shaft seals should be changed
without delay, as the leakage normally will grove worse
and cause additional damage.
Follow the instructions in the dismantling/reassembly
session. When working with a shaft seal, cleanliness is
of outmost importance. Avoid touching the seal faces.
If necessary, the seal faces should be cleaned imme-
diately prior to assembly, using a dust free cloth and
clean solvent.
Warranty matters
IMO AB´s warranty obligations covers new pumps for 1
year after the commissioning of the pump.
Parts that NOT are covered by the warranty are normal
wear details such as the mechanical shaft seal, the ball
bearing or the flexible coupling.
Precautions prior to
starting maintenance on
the pump
2
If the pumps operating temperature
exceeds 60°C, let the pump cool off before
any service, maintenance or dismantling
work is commenced to avoid burn injury
3
All work carried out on the pump has to be
performed in such a manner that risks for
personal injury are observed!
4
When handling liquids that may harm skin,
use gloves and/or protecting clothing!
5
When handling liquids which may involve
fire hazard appropriate precautions to
avoid danger are to be taken.
6
In case of failure for system with elevated
pressure, fluid jets may cause injury and/
or damage.
7
Oil leakage may make the floor slippery
and cause personal injury.
8
Before any maintenance work, ensure that
the driver is deenergized and the pump
hydraulically isolated.
9
Connecting and disconnecting of electrical
cables must be done only by personnel
authorized to do such work.
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