Good Question. I assume you are referring to the Maine Private Ways Statute (PWS), Title 23, Maine Revised Statutes (M. R. S.), Sections (§§) 3101-3106, commonly noted, 23 M. R. S. § 3101-3106.
The mechanism for enforcement resides in § 3102 and § 3104 of the PWS. These sections render the Statute and the rules and procedures set forth therein self-enforcing. I will expand on this statement in an attempt to achieve clarity.
In § 3104, Penalties and process, if your association plays by the rules, using a "fair and equitable" process to assign all owners a share of the costs of road repair and maintenance, then owners who do not pay their fair share will be held responsible and "any money owed pursuant to §§ 3101-3103 is an obligation that is personal to the owners of the subject parcels, ..., and also burdens the parcel and runs with the land upon the transfer of any owner's interest." Heavy stuff!
Further, in § 3102, the compliant owners may recover in a civil action the delinquent owner's portion "of labor, materials or money (owed) together with costs of suit and reasonable attorney fees". (my italics) More heavy stuff with sharp teeth!
Conversely, as the two attorneys who spoke at MARA Conference 2020 emphasized, if the Private Ways Statute is not followed to the letter, a sharp attorney for the delinquent owner may point out to the judge that a "fair and equitable" process (to include minutes within 30 days, commissioner or board "to be sworn") was not followed and his client cannot, therefore, be held to the penalties detailed above.
Playing by the rules within the Statute is "enforced" by the reward of recovering the unpaid maintenance fees, holding the offending owner accountable, and seeing justice prevail!