Märklin 60903 Handbuch Seite 7

Preconditions for the retrofitting of a
locomotive with 60903:
1. The locomotive must be classified as retrofittable
in the attached list of locomotives.
2. For locomotives requiring a relatively large amount
of conversion work, we recommend that the con-
version be carried out either by an authorised
repair workshop or by the Märklin Repair Service.
3. The model must be in good technical condition.
Worn bearings or brackets or too much play in the
transmission may be the cause of malfunctions in
the new, high-precision motor.
4. The model must be in factory configuration.
Retrofitted parts from other manufacturers may
make the conversion impossible.
Remove the existing, the armature and the field coil.
Test the mechanism to make sure that it works
properly.
Mount in succession the new permanent magnet
field, the new armature and the new brush plate.
Important: The older motors have in part a consider-
ably higher tolerance for assembly than the present
models. When the assembly has not been done
properly this can lead to poor motor performance
and greater consumption of power. The permanent
magnet field must be adjusted for position if neces-
sary when mounting the brush plate on it.
2. New Light Bulb Socket
When using the brown ground wire as a ground for
the headlights, you may observe an irritating flicker-
ing of the intensity for the lights. This flickering will
disappear when you use the orange ground return
wire for the headlights. The orange ground return
wire must however never come in contact with the
frame of the locomotive (contact may destroy the
decoder!). Where the headlight bulbs have a screw-
in or bayonet base the ground return for the light
bulbs is permanently connected to the locomotive
frame!
Two insulated light bulb sockets and two light bulbs
with plug-in contacts that fit into them are included
with this conversion kit to keep the headlights from
flickering with these locomotives. In many cases this
type of light bulb holder can simply be inserted from
above in the existing light bulb socket, without any
electrical contact being made. The two wires to the
new light bulb are drawn through the hollow mount-
ing rivet for the old light bulb socket.
7