A walk-behind floor scraper machine for removing floor covering from a floor surface; the walk-behind floor scraper machine comprising: a) a subassembly for a walk-behind floor scraper machine for removing floor covering from a floor surface; the subassembly comprising: a base frame defining an open channel with an end wall extending between a pair of sidewalls (32b, 32c), the base frame extending between a first end and a second end, the end wall defining: a first opening and bolt pattern for accepting one of a plurality of different electric motor sizes; a second opening and bolt pattern for accepting one of a plurality of different hydraulic pump sizes; a third opening and bolt pattern for accepting one of a plurality of different scraper assemblies configured for orbital or reciprocating movement with respect to the base frame; a tank-frame assembly including a mounting location for a hydraulic motor and defining an interior volume for storing hydraulic fluid of a hydraulic circuit, the tank-frame assembly being welded to the first end of the base frame; a support arm structure for supporting a handle assembly, the support arm structure being welded to the tank-frame assembly; and a mounting bracket welded to the second end of the base frame, the mounting bracket including at least one through hole extending in a direction parallel to a length of the base frame and being configured to secure one of a plurality of differently weighted front weight assemblies; b) an electric motor secured to the base frame; c) a scraper assembly movably secured to the base frame and driven by the electric motor; d) a rear wheel arrangement including a pair of wheels having a rotational axis; and e) a hydraulic circuit including: i) a hydraulic pump driven by the electric motor; and ii) a hydraulic motor powered by the hydraulic pump, the hydraulic motor having a drive axle coupled to each of the pair of wheels, wherein the drive axle is coaxially aligned with the rotational axis. a) a subassembly for a walk-behind floor scraper machine for removing floor covering from a floor surface; the subassembly comprising: a base frame defining an open channel with an end wall extending between a pair of sidewalls (32b, 32c), the base frame extending between a first end and a second end, the end wall defining: a first opening and bolt pattern for accepting one of a plurality of different electric motor sizes; a second opening and bolt pattern for accepting one of a plurality of different hydraulic pump sizes; a third opening and bolt pattern for accepting one of a plurality of different scraper assemblies configured for orbital or reciprocating movement with respect to the base frame; a tank-frame assembly including a mounting location for a hydraulic motor and defining an interior volume for storing hydraulic fluid of a hydraulic circuit, the tank-frame assembly being welded to the first end of the base frame; a support arm structure for supporting a handle assembly, the support arm structure being welded to the tank-frame assembly; and a mounting bracket welded to the second end of the base frame, the mounting bracket including at least one through hole extending in a direction parallel to a length of the base frame and being configured to secure one of a plurality of differently weighted front weight assemblies; a base frame defining an open channel with an end wall extending between a pair of sidewalls (32b, 32c), the base frame extending between a first end and a second end, the end wall defining: a first opening and bolt pattern for accepting one of a plurality of different electric motor sizes; a second opening and bolt pattern for accepting one of a plurality of different hydraulic pump sizes; a third opening and bolt pattern for accepting one of a plurality of different scraper assemblies configured for orbital or reciprocating movement with respect to the base frame; a first opening and bolt pattern for accepting one of a plurality of different electric motor sizes; a second opening and bolt pattern for accepting one of a plurality of different hydraulic pump sizes; a third opening and bolt pattern for accepting one of a plurality of different scraper assemblies configured for orbital or reciprocating movement with respect to the base frame; a tank-frame assembly including a mounting location for a hydraulic motor and defining an interior volume for storing hydraulic fluid of a hydraulic circuit, the tank-frame assembly being welded to the first end of the base frame; a support arm structure for supporting a handle assembly, the support arm structure being welded to the tank-frame assembly; and a mounting bracket welded to the second end of the base frame, the mounting bracket including at least one through hole extending in a direction parallel to a length of the base frame and being configured to secure one of a plurality of differently weighted front weight assemblies; b) an electric motor secured to the base frame; c) a scraper assembly movably secured to the base frame and driven by the electric motor; d) a rear wheel arrangement including a pair of wheels having a rotational axis; and e) a hydraulic circuit including: i) a hydraulic pump driven by the electric motor; and ii) a hydraulic motor powered by the hydraulic pump, the hydraulic motor having a drive axle coupled to each of the pair of wheels, wherein the drive axle is coaxially aligned with the rotational axis. i) a hydraulic pump driven by the electric motor; and ii) a hydraulic motor powered by the hydraulic pump, the hydraulic motor having a drive axle coupled to each of the pair of wheels, wherein the drive axle is coaxially aligned with the rotational axis.