Skip to main content

I have a Lionel GP35 (6-38975) that needs a new rear motor (6208860600).  I have a spare rear motor (6308942101) from an ES44AC (6-82205) that I could use.  The GP35 motor does not have a circuit board on it.  The wires are hooked directly to the motor.  The motor from the ES44 does have a circuit board on it that has a plug for the 2 wires to connect.  Can I use the ES44 motor in the GP35?  They look the same other than the circuit board.  I am thinking I would have to connect the wires directly to the motor instead of going to the leads on the circuit board.  Soldering wires to that motor will not be easy because the flywheel is there.  I tried to remove the flywheel but it's on there pretty good.  I'm about ready to order a new motor but thought I would ask first.

Original Post

Replies sorted oldest to newest

gunrunnerjohn posted:

The motor connections to the circuit board go direct to the motor, just connect to those and ignore the connector for the tach.

So these motors are interchangeable?  I’m not sure what you mean by connector for the tach. Do you mean the speed controller?  If so this motor doesn’t have that. It’s on the front motor. 

You stated you wanted to use the motor with the tach PCB for a replacement.  I was just addressing the issue you brought up putting the one with the tach PCB in place of the bare one.  I don't know without seeing them if the worm is compatible.  The motor drive connection on the motor with the tach go to the PCB, and they go directly to the motor terminals. 

Below is a picture of both motors. The one on the left is from the ES44 and the right was from the GP35.  I swapped out the motor and on the bench the rear motor is slow to start turning at slow speeds. The front one starts turning before the rear one.  They both spin at faster speeds. On the track it runs a little choppy at low speeds then smooths out. 4C54A0F2-F406-4F6E-9505-E47064F25300

Attachments

Images (1)
  • 4C54A0F2-F406-4F6E-9505-E47064F25300
Tanner111 posted:

 I swapped out the motor and on the bench the rear motor is slow to start turning at slow speeds. The front one starts turning before the rear one.  They both spin at faster speeds. 

The dual motors on legacy diesels do not spin at the same speeds unless under load. 

 I believe the "trailing motor" will always spin slower in an "unloaded " situation like in a cradle.

This is by design of the speed control.

The nice thing about at least *some* of the Legacy diesels, is that the gears are back-drivable.  In other words, the wheels can turn the motor, and therefore the faster motor can "help" the slower one.  Adopting back-drivable gears went a long way toward taming the infamous Odyssey "lurch."  It also improves coasting and the sense of mass when running the train.  BTW, most if not all of Lionel's postwar locos were built this way.

Another nice thing about the LionDrive system is that they all use the RS-385 motor with a horned ball type universal coupling.  So you don't need to find an exact donor motor with a worm gear of the same pitch, diameter, and length.

Last edited by Ted S

sd70ace 6-28333  Rear motor will not start with front motor. replaced with new Lionel motor, did not solve the problem. voltage is the same as the front motor, drive gears and gear box runs free. changed RF board, did not help. New motor controller board?? Front motor runs strong. replace wiring on rear motor. Rear motor acts like its not getting enough amps. any ideas?

Yes sir...on bench wheels free, rear motor starts after front motor at 1 volt. parallel wiring from front motor circuit board, run speed control up and down... seemed OK.. On track engine preformed pretty good for a few minutes... than at different low, medium, high momentum, rear truck wheels continued to drag or not turn when front truck wheels where spinning to move forward or reverse. rear motor would finally start at a higher velocity, about 4 or 5 volts....Thanks

Add Reply

Post

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

×
×
×
×
Link copied to your clipboard.
×
×