Nordson VDK-MIDI TYPE 6, Operating Instructions Manual

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Type 6
5
E
2010
Gear Pump
Operation of new pumps
Pumps are supplied in oiled condition in order to protect them against
corrosion. To avoid dry run of the rotating parts during the start--up to the
point where the self--lubricating polymer provides the necessary lubrication,
driving arbor, stud and gears should be oiled by a few dropsof high
temperature resistant silicon oil (f.i. AP 500 stab Messrs. Wacker--Chemie,
Munich/Germany).
After starting, the pump should operate as soon as possible with polymer.
If the pump cannot be turned before working, it is recommendable to
disassemble the pump and to clean it carefully from any pollution.
Before mounting all parts must be completely clean and dry. When
mounting, apply again some drops of silicon oil to the a/m. parts.
It is very important for the precision function that the surface of the spinning
head are clean and plain.
We recommend:
Flatness appr. 2
µ
m
Surface roughnes R
a
=
0,2
µ
m (R
t
=1
µ
m)
If the surface of the spinning head is not plain enough, the pump can be
distorted when screwing, or the metallic sealing between pump and the
surface of the spinning head can no longer be guaranteed.
Before start--up make sure, that the pump is sufficiently filled with
polymer!
In order to have a pump exchanged very quickly and have only small loss
production, it is recommendable to heat the pumps in an electric oven up to
operating temperature. With this method the pump has nearly the same
temperature as the spinning head when mounting. The polymer does not
freeze and can be delivered easily.
After mounting, check the easy running of the pump.
When driveing the pumps with extended shaft, the following points have to
be observed:
1. coupling has to balance eccentricity and deviation in angle,
2. if possible apply universal shaft with length compensator,
3. avoid axial and radial pressure on driving arbor of the pump.