Legacy Lionmaster Big Boy Jerks

quote:

Originally posted by RickO:
I had a legacy gp7 where the flywheel with the tach reader came loose on the shaft and produced similar erratic behavior. I retightened the set screw on the flywheel and it runs fine.

quote:

Originally posted by iguanaman3:
Lionel has never used a flywheel tape, Odyssey engines use a magnet on the flywheel and a Hall sensor. You may have a broken magnet, if so you will see it when you take it apart.

Neil

quote:

Originally posted by RickO:

quote:

Originally posted by iguanaman3:
Lionel has never used a flywheel tape, Odyssey engines use a magnet on the flywheel and a Hall sensor. You may have a broken magnet, if so you will see it when you take it apart.

Neil

LEGACY/ODYSSEY II locos have a slotted plastic ring on the flywheel that passes through a reader.

Where can I find the slotted plastic ring on the flywheel that passes through a reader?

P.N. 610-1104-135

Bill

All good advice from the guys.  Whenever crazy situations like yours exist, I always like to pull all the boards and reseat them.  I then pull the plugs out of the motor driver board and do the same.  Most of the time you can get lucky.

Thanks Bill, I now what this looks like.  Once I open up this engine is it easy to find?  I am going to do all the board resets as well. 

I opened it up and check all the connections.  it is still accelerating fast and returning to normal speed.  :-( 

Greg

  I would suspect the motor encoder board.

Bill

Greg, did you check that the brass flywheel with the tach ring on it is not loose on the motor shaft as I metioned above?  Spin that flywheel with your finger and see if it turns the drivers,if it doesn't you need to tighten the set screw in the flywheel. If it slips on the motor shaft the it gets a false slow reading and loco trys to compensate by speeding up the motor.

Do as RickO suggest, I was thinking you had done that but it was KenG that checked his flywheel and it was tight.

Bill

Rick, Bill,

Thanks for the help here.  Rick I missed the brass flywheel point in your prior post.  When you say spin the flywheel and the drivers should turn are you actually talking about the wheels?  Sorry that may seem like a basic question.  In the Legacy LM Bigboy I think there are two flywheels, one for the front set of wheels and one for the back.  I think I saw the tach ring on the back set.   I will open up again tonight and check this.  I think I tried to spin the back flywheel last night almost ½ to ¾ turn and nothing happened.  Maybe this is the culprit. 

If you spin the flywheel 1/2 a turn, something should happen at the driving wheels for that gearbox!

Yes, spin the flywheel (with the tach ring) a few turns and see if that set of drive wheels turn, they will turn very slowly but turn nontheless. If you can, just to be sure, add some resistance to that set of drivers either from the track or hold the a bit with your free hand. If you determine that the flywheel is indeed loose there is a set screw in the recessed hole of the flwheel. You may want to shine a flashlight in that hole there and see if you can figure out what type of screw head it is. I have some that are small metric allen heads and some that are a small flatblade screwdriver, I used a screwdriver from an eyeglass kit for this.

OK, tried that.  The flywheel was tight.  With some resistance both the front and rear wheels turned.  I put it back on the track and it ran well for about 5 minutes then started speeding up and returning to set speed.  I have done all I can do at this point.  I will call Lionel tomorrow. 

John, Rick, Bill - thanks for all your help.

I would email them in the "Contact Us" "Service/Repair question" heading. You'll likely have a reply with the necessary RA# tommorrow AM. It is my impression the "techs" read the emails. Phone calls get answered by the "customer service lady", save yourself a step and go directly to the source.