Problem with 7722

[Bison]

I have a 7722 set, and when I go flip the switch the train sometimes doesn't start up. I have to hit it on top of the train to get it to run for a while, but then it's back to not working. Please help.

Thanks.

[JopieK]

Could you be a little more specific?! What does the motor do if you connect it to a cable (directly from the transformer?!).

[Bison]

The motor runs off and on in the forward setting, in the reverse setting it runs just fine and a little faster.

[JopieK]

yes that is what you said, but... you don't mention how you test the motor, only on the tracks, or also using the output from the motor connecting it to the transformer, touching wires to the copper contacts and see how it reacts then... we can not see in your LEGO room, so if you don't give us very specific details it will be very hard to guess the problem. It might be the brushes, but I'm not sure since you don't give us enough details.

[rsb0204]

yes that is what you said, but... you don't mention how you test the motor, only on the tracks, or also using the output from the motor connecting it to the transformer, touching wires to the copper contacts and see how it reacts then... we can not see in your LEGO room, so if you don't give us very specific details it will be very hard to guess the problem. It might be the brushes, but I'm not sure since you don't give us enough details.

well actually he gave plenty of details, see 7722 is a 4.5v set, no transformer, no brushes, just direct battery power. it appears as though you have it confused with a 12v set. now as for the problem your having, its probably the battery box car. the switches don't ever seem to work quite right on them, most of the time the insides of the switch isn't making proper contact due to corrosion or the contacts are just worn out. this is one of the reasons I changed my 7722 to a tender battery box (much like a 122 would have) as it has been my experience that they are more reliable. not to mention 7722 looks better with a tender. if you really want to keep the original battery box car id recommend taking it apart and giving it a good cleaning, and wile you have it apart check for defects and wear. ofcourse if it is badly worn you will probably have to replace it.

[JopieK]

yups, sorry about that, I indeed just imagined that it was a 12V set!

Then you should take a different approach:

- use a multimeter to check what comes out of the battery box!

- check a different motor if possible

[Bison]

I used a multimeter and got a reading of 4.3 volts. Tried a new motor a it worked just fine, a little high pitched but some 3&1 oil fixed her right up. Thanks for all the help guys.