NIDAIFEI mower idler pulley kit for Hustler Raptor decks — 3-piece set (604231, 605512, 604219) direct-fit OEM sizes

NIDAIFEI’s three-piece idler pulley set replaces Hustler part numbers 604231, 605512 and 604219 to restore smooth belt routing on 48" and 52"–54" mower decks.

When a mower deck whistles, slips belts, or develops uneven blade speed, worn idler pulleys are often the cause. This kit provides all three pulleys used on many Hustler Raptor and similar models so you can replace every idler in one maintenance session. Each pulley matches the original outside diameter, inside bore, and height specifications to fit existing shafts and fasteners without modification.

Which pulleys are included and what are their dimensions?

The set contains one 604231, one 605512 and one 604219 idler pulley. Each wheel is engineered to match Hustler OEM sizing so installation is straightforward.

• 604231: OD 5.74" × ID 0.5" × Height 1.32"
• 605512: OD 4.87" × ID 0.5" × Height 1.17" (flat OD 4")
• 604219: OD 4.88" × ID 0.5" × Height 1.18"

How does this kit simplify deck repairs?

Instead of removing and reinstalling multiple individual pulleys over separate visits, this three-piece set lets you change all idlers during a single disassembly. That reduces labor, avoids repeated belt tensioning steps, and restores consistent pulleys across the deck for balanced performance.

• All three pulleys included to complete a full idler refresh
• Sized for direct swap with Hustler OEM locations—no machining required
• Single-removal replacement minimizes downtime and repetitive work

Which Hustler mower models and manuals list these parts?

The pulleys fit a broad range of Hustler Raptor and Raptor SD model decks listed in Hustler parts manuals for 48" and 52"–54" variants. Cross-reference your deck parts manual to confirm part numbers match before ordering.

• Fits Hustler 48" Raptor SD and Raptor SD EX series as listed in parts manuals
• Fits Hustler 52"–54" Raptor, Raptor Limited and many Raptor-series decks
• Compatible with numerous Hustler manual numbers like 934547US, 934513US, 937789 and others

What should I check during installation to ensure long service life?

Inspect mounting shafts, bushings and belt alignment before fitting the new idlers. Proper belt tension and clean mounting hardware help prevent premature wear and keep belts tracking correctly across the deck.

• Confirm shaft diameter is 0.5" and clear of burrs
• Replace fasteners or bushings if worn or corroded
• Set belt tension per your mower’s service manual after installation

Who is this for: This NIDAIFEI pulley set is designed for owners, fleet managers and service technicians who maintain Hustler Raptor-series decks or similar commercial/consumer mower models. If you need a convenient, accurate replacement for the three most commonly worn deck idlers—saving time on repetitive tear-downs—this kit supplies OEM-compatible dimensions and a complete repair solution to get decks back to reliable operation.