ORIGINAL MFG. REPLACEMENT PART 41A2817

Item number#3 (See Illustrated parts) Gear Kit

LIFTMASTER
Drive Models 1984 TO CURRENT MODEL Numbers: 1050 1055 1060 1140 1145 1150 1155 1160 1240 1245 1240R 1245 1245R 1245LK 1246 1250 1255 1255R 1260 1265 1270 1280 1280R 2280
2245 2255 2265 985 215WD 220WD 300WD UMBERS 1040 1045 310WD 320WD 2565 2575 2580 2585 2595 ATS211 ATS211R ATS211X

CHAMBERLAIN MODELS
140 150 240 350 450 550 5100 6200 7200 7220 700WHC 710 WHC 1000 1100 1200 2000 2100 2200 4000 4100 4200 PD610 PD612K PD 210 7420

This is a rebuilding kit,remove the entire assembly,remove the lower roll pin from the shaft and replace the worm gear. Inspect the drive gear, if not worn,do not replace.