AMETEK Pittman GM9213-4 Gearmotor, 12VDC, 13rpm no load, 5.6oz/in tor const, .1/1.44A, 218.4 ratio Overview Pittman brand LO-COG brush-commutated DC Gearmotors offer smooth, quiet operation and long life. LO-COG gearmotors feature sintered steel spur gears and are available with several reduction ratios and torque ratings to provide an economical solution for a wide range of applications..