The MA2MSUB underslung feed motor is a powerful five piston radial pneumatic motor used to power screw feed assemblies for PR123 and DH123 rock drills. The MA2MSUB motor is designed as a modular unit to fit on various lengths of aluminum guide shells.

The feed motor is lubricated by its own exhaust air which circulates though the motor.

Motor in Feed Assembly 
Feed Assembly in Complete Drill Assembly