603805 idler pulley replacement for Exmark mower decks.

603805 Idler Pulley Replacement for Exmark Mower Decks

1 Pack
$31.95
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603805 idler pulley replacement for Exmark mower decks.
  • 603805 idler pulley replacement for Exmark mower decks.
603805 Idler Pulley Replacement for Exmark Mower Decks

603805 Idler Pulley Replacement for Exmark Mower Decks

$31.95
Pack Quantity

Overview

This aftermarket 603805 idler pulley is a replacement mower deck pulley for compatible Exmark mower deck applications.

Use this listing when your original pulley number matches 603805 or one of the replacement numbers below. This pulley has 119.8 mm outside diameter, 9.88 mm bore, 23.7 mm pulley width.

Key Features

  • Product Type: Idler Pulley
  • Outside Diameter: 119.8 mm
  • Bore / Center Hole: 9.88 mm
  • Pulley Width: 23.7 mm
  • Aftermarket replacement pulley for mower deck belt-drive systems
  • Use for compatible Exmark mower deck applications

Compatible Brands & Model Series

Common compatible model paths include:

  • Exmark: FMD52 - Exmark 52-inch Turf Ranger Front Mount Mower (SN: 070000 - 079999) (1992)
  • Exmark: FMD52 - Exmark 52-inch Turf Ranger Front Mount Mower (SN: 080000 - 089999) (1993)
  • Exmark: FMD52 - Exmark 52-inch Turf Ranger Front Mount Mower (SN: 090000 - 101999) (1994)
  • Exmark: FMD52 - Exmark 52-inch Turf Ranger Front Mount Mower (SN: 102000 - 114999) (1995)
  • Exmark: FMD52 - Exmark 52-inch Turf Tracer Hydro Walk-Behind Mower (SN: 070000 - 079999) (1992)
  • Exmark: FMD52 - Exmark 52-inch Turf Tracer Hydro Walk-Behind Mower (SN: 080000 - 089999) (1993)
  • Exmark: FMD52 - Exmark 52-inch Turf Tracer Hydro Walk-Behind Mower (SN: 115000 - 129999) (1996)
  • Exmark: FMD52 - Exmark 52-inch Turf Tracer Hydro Walk-Behind Mower (SN: 102000 - 114999) (1995)
  • Exmark: FMD522 - Exmark 52-inch Turf Ranger Front Mount Mower (SN: 115000 - 129999) (1996)
  • Exmark: FMD523 - Exmark 52-inch Turf Ranger Front Mount Mower (SN: 150000 - 189999) (1998)
  • Exmark: FMD523 - Exmark 52-inch Turf Ranger Front Mount Mower (SN: 190000 - 219999) (1999)
  • Exmark: FMD523 - Exmark 52-inch Turf Ranger Front Mount Mower (SN: 220000 - 259999) (2000)
  • Exmark: FMD523 - Exmark 52-inch Turf Ranger Front Mount Mower (SN: 260000 - 319999) (2001)
  • Exmark: FMD523 - Exmark 52-inch Turf Tracer Hydro Walk-Behind Mower (SN: 130000 - 149999) (1997)
  • Exmark: FMD523 - Exmark 52-inch Turf Tracer Hydro Walk-Behind Mower (SN: 150000 - 189999) (1998)
  • Exmark: FMD523 - Exmark 52-inch Turf Tracer Hydro Walk-Behind Mower (SN: 190000 - 219999) (1999)
  • Exmark: FMD523 - Exmark 52-inch Turf Tracer Hydro Walk-Behind Mower (SN: 220000 - 259999) (2000)
  • Exmark: FMD523 - Exmark 52-inch Turf Tracer Hydro Walk-Behind Mower (SN: 260000 - 319999) (2001)
  • Exmark: FMD524 - Exmark 52-inch Turf Ranger Front Mount Mower (SN: 320000 - 369999) (2002)
  • Exmark: FMD524 - Exmark 52-inch Turf Ranger Front Mount Mower (SN: 370000 - 439999) (2003)
  • Exmark: FMD524 - Exmark 52-inch Turf Ranger Front Mount Mower (SN: 440000 - 509999) (2004)
  • Exmark: FMD524 - Exmark 52-inch Turf Ranger Front Mount Mower (SN: 510000 - 599999) (2005)
  • Exmark: FMD524 - Exmark 52-inch Turf Tracer Front Mount Deck (SN: 000600000 - 000669999) (2006)
  • Exmark: FMD524 - Exmark 52-inch Turf Tracer Front Mount Deck (SN: 000670000 - 000719999) (2007)
  • Exmark: FMD524 - Exmark 52-inch Turf Tracer Front Mount Deck (SN: 000720000 - 000789999) (2008)

Replaces OEM Part Numbers

  • 603805
  • 99-4638

Common Symptoms of a Worn Deck Pulley

  • Mower deck belt squealing, slipping, or jumping off track
  • Visible pulley wobble or uneven belt tracking
  • Grinding, rattling, or bearing noise near the deck pulley
  • Reduced blade speed or inconsistent cut quality caused by poor belt tension

Why Buy From PTO Direct USA?

  • Fast USA shipping
  • Fitment-focused replacement parts support
  • Clear part-number matching to help reduce wrong-part orders
  • Replacement mower deck parts for homeowners, shops, and landscape crews

Need Help Confirming Fitment?

If you are not sure this is the correct pulley, send us your mower model number, deck size, and the part number from your original pulley. We can help compare the replacement path before you order.

FAQ

How do I confirm this pulley fits my mower?

Start by matching the OEM pulley number on your original part. Then compare the outside diameter, bore or center-hole size, pulley width, belt profile, deck layout, and mower model.

Can I order by appearance alone?

No. Similar-looking deck pulleys can have different bore sizes, offsets, belt profiles, and deck applications. Match the part number and dimensions first.

What causes a mower deck pulley to fail?

Common causes include worn bearings, belt misalignment, impact damage, seized hardware, or long-term wear from deck belt tension.

Need another pulley? Browse the full mower deck pulley collection for additional replacement options.

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