Bob M experienced a loss of assist while riding his E-700. He could hear the motor running, so the problem could have been a defective blue nylon drive gear/Sprague bearing combo in the motor housing. I ordered a new gear a couple of days ago and received it this afternoon. Spent several hours replacing the old gear and greasing the new gear and the big drive gear on the right side of the drive. Seems to be operating normally now.
 
 
 
 
Drive installed on Catrike 700                                                                                                                                        Left housing cover removed, revealing motor and controller
 
 
 
 
Motor removed, revealing blue nylon drive gear                                                                                                               Motor
 
 
 
 
Motor and blue gear removed                                                                                                                                        No obvious damage to gear, but grease around gear contained rust
 
 
 
 
Blue gear lubricating grease recommended by ECO Cycles                                                                                                  Sprocket and main drive gear cover  
 
 
   
 
Sprocket and main drive gear cover removed, revealing gear and large Sprague clutch bearing in gear center                                      Main drive gear lubricant recommended by ECO Cycles        

Thanks, Mike.

Quote from TonyWard on Feb 25^th, 2023, 8:45pm:

 
Thanks, Tony. Still doing well.  
 
The TSDZ2 Tongsheng drive is perfect for the DIYer, because all the individual drive components are readily available online (Amazon, Ebay, and AliExpress).