The E8M motor must be different than my E15. The E15 is a compound wound motor. It has a big thermal cutout switch that interrupts current flow through the series winding/ armature. It has two ring terminals and 8 gauge wire connected to this device.
The push on terminals are for the shunt field which carries very little current. Rod Scott; The two push-on terminals are for the internal thermal cut-out circuit breaker that protects the motor from over temperature. -S