Digging up this old bone.
I've come into possession of one of these, and it has a bad universal, causing one truck to slip while the other struggles to propel the engine.
The design of the universal is terribly finicky. The little eyelet that is supposed to transfer torque from the flywheel to the worm is awfully fragile.
I've fiddled with it but am ready to give up.
Any tricks or tips to getting this thing to run reliably?
I also have an SD24 that suffers the same malady, but I haven't yet taken it apart to diagnose. Both share the same universal design. It's the "male universal" bit that appears to be the problem. Part 540104, which naturally isn't available. Looks like this -o- very tiny plastic bit. It doesn't take much to shear off one of the - bits.
Talk to me.
Lee