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RailKing SD-90 MAC Operating Manual
over the wheel. If a twist occurs, the tire will have to be removed and
reinstalled or a noticeable wobble in your engine will occur when operating
the locomotive. In addition, it is important to make sure that the tire is
fully seated inside the groove. Any portion of the tire extending out of the
groove can cause the engine to wobble. A razor blade can be used to trim
away any excess tire that doesn’t’t seat itself inside the groove properly.
Once the new tire(s) are in place, reassemble the truck sides to the truck
blocks and then reassemble the chassis to the body. Replacement tires are
available directly from MTH Electric Trains.
HEADLIGHT REPLACEMENT
The SD-90 MAC locomotive contains one bayonet 18v headlight bulb that
is controlled by the track voltage. The headlight bulb simply plugs into its
lamp socket and can be easily removed should the bulbs expire. To remove
the bulbs, follow the cab removal instructions found in the lubrication
section on the preceeding pages. Once the cab has been removed from the
chassis, gently twist and push the bulb to unlock it from its lamp housing.
Once unlocked, the bulb will pull out of the socket. Replacement bulbs are
available directly from MTH Electric Trains.
