Need wiring diagrams for GE Spindle DC drive

[Banzai11]

We are in the process of a Lucas Horizontal Mill retrofit.
I need the diagrams and any info on the wiring for the spindle drive aka GE "Speed Variator"

From the GE plate:
36c766071 360867561

Model: 6V30F3213 or 6V50F3186
SN: DJ727-1-1
Drive code: DC3031R


Photos are attached of the control.

Any suggestions one where I can get or find these diagrams?
We are using MACH3 and all was going good until this.