The Toro OEM 131 5988 Hydraulic/Drive Flat Idler is manufactured with strong steel alloy and high-quality ball bearings to ensure dependable operation in harsh, wet, hot, and dirty conditions. Built to original specifications, this Flat Idler is designed to maintain correct tension on Hydraulic and/or Traction Drive Belts. 131 5988 OEM Flat Idler is compatible with a variety of Toro models, including the Late 50" Timecutter MX - Snow Blower SnowMaster SnowMAX & SnowThrower Models. Due to Variation Within Model Numbers/Series, please refer to the Images above; Product Specifications and to the Model Fit Chart below for an Accurate Break down of Specific Model Number Usage. For Additional Fastner & Associated Part references for Idler Pulley 131-5988 review the Associated Parts Link Below the Model Fit Chart. If You are Having Trouble Finding the Correct Hydraulic Idler Pulley Combination for Your Model, there is also a Chart with Detailed Break Down with Common Family and Model Numbers with the Correct Idler Pulley Part Number Combination Above in the Images as well as Below the Model Fit Guide and The Associated Part References. If this still doesn't prove helpful feel free to contact us with your questions. Part Number 131-5929 Supersedes to Part Number 131-5988 NOTE: Due to Serial Number and/or Model Design changes it is always Beneficial to Eliminate Confusion by Searching your Part Type and Model Number at the Top of our Website Page in the Search Tab. That in return will search the Model Fit Chart at the Bottom of the Page to Find the correct Model/Pulley Part Number Combo. Specification Product Number: 1315929, 1315988 Brand: Toro Length: NA Width: NA Height: NA Weight: 0.250 LB (0.113 KG) Model Fit: 50” Timecutter – 131-5988 MODEL/SERIES USAGE 50” TIMECUTTER MX Series – Model Numbers – (* Model Numbers 74768, 74778) SNOW BLOWER – 131-5988 MODEL/SERIES USAGE SnowMaster QXE (Traction/Drive Belt) – Model Numbers – (* Model Numbers 36001, 36002, 36003) SnowMaster MAX (Traction/Drive Belt) – Model Numbers – (* Model Numbers 39914, 39915) E-SnowMaster MAX (Traction/Drive Belt) – Model Numbers – (* Model Numbers 31860) SnowThrower (Traction/Drive Belt) – Model Numbers – (* Model Numbers 38710, 38711, 38712) ASSOCIATED PARTS REFERENCES FOR PART NUMBER 131-5988 ONLY CLICK ON THE ASSOCIATED PART NUMBER TO BE REDIRECT TIMECUTTER MODELS 74768 & 74778 ONLY 322-9 - IDLER PULLEY BOLT - (Retains Flat Idler) x1 Per Flat Idler Pulley Fastened to Idler Arm 80-6990 - IDLER PULLEY WASHER - (Enables the Correct Tightening Diameter Against the Flat Idler Bearing Surface) x1 Per Flat Idler Pulley 137-1987 - IDLER ARM - (Retains One Flat Idler Pulley for Belt Tensioning Purposes) x1 Per Unit 104-8301 - IDLER PULLEY NUT - (Retains Flat Idler) x1 Per Flat Idler Pulley Fastened to Idler Arm SNOWMASTER SNOWMAX & SNOWTHROWER SNOWBLOWER ONLY 137-3065 - IDLER PULLEY BOLT - (Retains V-Idler) x1 Per V-Idler Pulley 131-1795 – TENSIONER/TRACTIONER ARM - (Arm to Which V-Idler Remains Fastened to and Enable Traction Drive when Tension is Applied the Traction Belt) x1 Per Unit 121-4600 - IDLER PULLEY NUT - (Retains V-Idler) x1 Per V-Idler Pulley