2 Pack 605512 Pulley Replaces Hustler 605512 Idler Pulley, Hustler Raptor Pulley 603986 Pulley for Hustler Raptor SD 54 60 inch, Hustler Raptor 52 42 inch 938605 937854 939223 937847 Decks

What It Is

This is a 2-pack of aftermarket idler pulleys (part number 605512) designed to replace the factory pulleys on Hustler Raptor zero-turn mowers. It routes and tensions the deck belt to keep the blades spinning, and it’s intended for Hustler Raptor models with 42-, 52-, 54-, and 60-inch cutting decks.

Fitment & Compatibility

Before buying, confirm your mower model and deck size. These pulleys replace OEM Hustler part numbers 605512, 603986, 938605, 937854, 939223, and 937847. They fit Hustler Raptor SD 54” and 60” decks, as well as Raptor 42” and 52” decks. Measure the pulley diameter (typically 4.0” or 4.5”) and verify the bearing bore size (usually 5/8” or 3/4”) matches your spindle shaft. Check your deck’s belt routing diagram to ensure the pulley offset and groove profile are correct. If your mower uses a different OEM number not listed, compare physical dimensions.

Key Things to Know

• Quality: These are aftermarket, not OEM. They’re typically made of stamped steel with sealed bearings. Expect decent durability for residential use, but may not hold up as well under heavy commercial duty.
• Installation: Easy DIY job. Remove the deck belt, unbolt the old pulley (usually a single center bolt), and bolt the new one on. A socket wrench and maybe a breaker bar are all you need.
• Gotchas: The bearing may be pre-greased but not serviceable—if it fails, replace the whole pulley. Check the belt tension after installation; a loose belt can cause slippage or poor cutting.
• Pairing: Since it’s a 2-pack, you can replace both idler pulleys at once. This is smart because if one fails, the other is likely close behind.

Should You Buy It

If you have a Hustler Raptor with a 42–60-inch deck and need a budget-friendly, direct-fit replacement for a worn or noisy idler pulley, this 2-pack is a solid choice. It’s best for homeowners or light commercial users who want to save money over OEM parts and don’t mind swapping two pulleys at once for preventive maintenance.