... ) Note:1,Housing material,Zinc alloy. 2,Backlash,at no-load: ≤2° 3,Bearing at output: sleeve bearings 4,Radial play of ... RF-370 motors. 7,When the motors using at low speed,high gear ratio will cause gear motor ... torque more than 30kgf.cm.At this torque the gears will be broken easily. ... 30.3No.of teeth1215Pressure angle20°Hole diameter1.98, 2.28, 2.98Reduction ratio4,19,22.5,90,107,304, ...