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If you have the mostly used AUF301/AZX1308 with points you should not worry as
these are dual polarity. However if you have an electronic version (EN or EP
added to the model number, e.g. AZX1308EN = AZX 1308 Electronic Negative earth)
you should not reverse polarity as this will damage the electronics.
If you do not know what SU-pump you have remove the Bakelite pump cover. If
there is a small metal or grey/yellow cylinder with 47uF printed on it
(capacitor) it is dual polarity and you will be OK.
If there is a green disk with electronic components and no points it is
polarity sensitive
If there is a small disk shape component between the feed screw and the small
screw for the blades it is a diode and the pump will be polarity sensitive.
Pos. earth pumps should have a red tape around the coil body.
If it is a late pump there could be a very small more or less ball shaped item
fitted to one of the pedestal screws to earth and the screw that holds the
points blade which probably is a sort of bidirectional Zener diode or transil.
Such a pump should be dual sensitive.
When I rebuild my pumps I replace the original transil or diode with a 18V
transil according to my own specs. The transil is fitted to one of the pedestal
screws to earth and the screw that holds the points blade. If the pump has a
capacitor fitted I fit an extra transil in parallel with the capacitor. So all
my rebuild pumps are dual polarity.
Kees Oudesluijs
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<html><head>
<meta charset=3D"UTF-8">
</head><body>If you have the mostly used AUF301/AZX1308 with points you sho=
uld not worry as these are dual polarity. However if you have an electronic=
version (EN or EP added to the model number, e.g. AZX1308EN =3D AZX 1308 E=
lectronic Negative earth) you should not reverse polarity as this will dama=
ge the electronics.<br>If you do not know what SU-pump you have remove the =
Bakelite pump cover. If there is a small metal or grey/yellow cylinder with=
47uF printed on it (capacitor) it is dual polarity and you will be OK. <br=
>If there is a green disk with electronic components and no points it is po=
larity sensitive<br>If there is a small disk shape component between the fe=
ed screw and the small screw for the blades it is a diode and the pump will=
be polarity sensitive. Pos. earth pumps should have a red tape around the =
coil body.<br>If it is a late pump there could be a very small more or less=
ball shaped item fitted to one of the pedestal screws to earth and the scr=
ew that holds the points blade which probably is a sort of bidirectional Ze=
ner diode or transil. Such a pump should be dual sensitive.<br>When I rebui=
ld my pumps I replace the original transil or diode with a 18V transil acco=
rding to my own specs. The transil is fitted to one of the pedestal screws =
to earth and the screw that holds the points blade. If the pump has a capac=
itor fitted I fit an extra transil in parallel with the capacitor. So all m=
y rebuild pumps are dual polarity.<br>Kees Oudesluijs<br></body></html>
=20
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