If the plate creeps when the control lever is centered, the neutral adjustment is off.
If you want, I can:
This article summarizes the key contents and how to use a service manual for the BOMAG BMP851 (single drum vibratory roller). It’s intended to help maintenance technicians, fleet managers, and owners understand what to expect in the manual and how to apply it for safe, efficient repairs and preventive maintenance. service manual for bomag bmp851