LEFT SPROCKET GEAR TRACTION LAWN MOWER ORIGINAL LAWN MOWER AS-MOTOR TECHNICAL SPECIFICATIONS MODELS 21 AH1 , 21 165 , 26 AH9 , 28/4 , 45 B4 , 45 B3 , 45 B4 , 53 B1 , 53 B3 , 53 B4 , 53 B5 , 53 B6 , 480 , 530 NUMBER TEETH 9 CODE: 822E03125 ORIGINAL CODE: G06125010 , E03126 SR