Troy Bilt Tiller PTO Pulley Shim part# 1138-1 is used between the step in the crankshaft and the Engine PTO Pulley to allign it with the pulley on the tiller transmission. Following is a listing of models that utilize this part; 12055, 12056, 12057, 12058, 12059, 12060, 12061, 12062, 15006, 15008, 15009, 15010, 21A-510-081, 21A-511-181, 21A-520-081, and 21A-5821-081. There are models that use this shim that we have not listed here, so please check your owners manual for the correct part number for your particular model. Superseded to part #73604187.
