AD 56454484 Electric Drive Motor for Nilfisk Advance Riding Floor Scrubbers. A 36V, 4hp electric drive motor. This motor mounts to the transaxle assembly and drives the unit forward/reverse. Fits many older Advance models including Hydro Retriever 5000B (Battery Model), 5010B (Battery Model), HydroCat 5015, Hydro Retriever 2052 (Hydro-Max II Battery Model), and Nilfisk CR 1300 (Hydro-Max II Battery Model). Priced Each. Replaces Nilfisk Advance 56454484. Our Part Number AD 56454484