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-pump are lubricated by the
pumped liquid.
Pumping liquid which contain abrasive materials, or
liquid that is corrosive, will signicantly reduce service
life and call for shorter service intervals.
Wear in the pump will normally show as:
• Vibration
• Noise
• Loss of capacity
• Reduction in ow/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 de-
scribed in the dismantling section, loosen the rear cover
(480) with valve. Screw out the idler rotors backwards.
Internal clearances in the pump, which are vital for its
proper function, may have been aected by wear. Ac-
ceptable 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 anks: 0.4 mm For light
duties (low pressure, medium viscosity) even bigger
clearances may be acceptable but for low visc./high
pressure 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 sha seal are lubricat-
ed by the uid 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 sha seal is not
leaking too much.
Excessively leaking sha seals should be changed with-
out delay, as the leakage normally will grove worse and
cause additional damage.
Follow the instructions in the dismantling/reassembly
session. When working with a sha seal, cleanliness is
of outmost importance. Avoid touching the seal faces.
If necessary, the seal faces should be cleaned immedi-
ately prior to assembly, using a dust free cloth and clean
solvent.
Warranty matters
IMO AB´s warranty obligations covers new pumps for 1
year aer the commissioning of the pump.
Parts that NOT are covered by the warranty are normal
wear details such as the mechanical sha seal, the ball
bearing or the exible coupling.
Precautions prior to starting maintenance on
the pump
2
m
If the pumps operating temperature
exceeds 60°C, let the pump cool o before
any service, maintenance or dismantling
work is commenced to avoid burn injury
3
m
All work carried out on the pump has to be
performed in such a manner that risks for
personal injury are observed!
4
m
When handling liquids that may harm skin,
use gloves and/or protecting clothing!
5
m
When handling liquids which may involve
re hazard appropriate precautions to
avoid danger are to be taken.
6
m
In case of failure for system with elevated
pressure, uid jets may cause injury and/
or damage.
7
m
Oil leakage may make the oor slippery
and cause personal injury.
8
m
Before any maintenance work, ensure that
the driver is deenergized and the pump
hydraulically isolated.
9
c
Connecting and disconnecting of electrical
cables must be done only by personnel
authorized to do such work.
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