[Lifetime Warranty] M174994 Mower Deck Belt Replacement - for 42-inch Deck John Deere X330 X350 X354 X370 Lawn Mower | Heavy-Duty Aramid Cord | 1/2" x 144.8"
M174994 heavy-duty aramid mower deck belt in branded packaging for John Deere lawn mowers.
M174994 mower deck belt specifications chart showing dimensions and close-up of 144.8-inch length marking.
M174994 mower deck belt compatibility chart for John Deere X330, X350, X354, and X370 lawn mowers.
Infographic guide for identifying M174994 mower deck belt application and compatibility for John Deere lawn mowers.
M174994 mower deck belt replacement for John Deere 42-inch decks with maintenance compatibility chart.
M174994 mower deck belt features and material composition infographic for John Deere lawn mowers.
M174994 mower deck belt replacement for John Deere X330 lawn mower with troubleshooting guide.
BlueStars M174994 mower deck belt comparison chart showing heavy-duty aramid cord construction for John Deere mowers.
M174994 mower deck belt installation guide showing inspection tips for pulleys and tensioner springs.
M174994 heavy-duty aramid mower deck belt in branded packaging for John Deere lawn mowers.
M174994 mower deck belt specifications chart showing dimensions and close-up of 144.8-inch length marking.
M174994 mower deck belt compatibility chart for John Deere X330, X350, X354, and X370 lawn mowers.
Infographic guide for identifying M174994 mower deck belt application and compatibility for John Deere lawn mowers.
M174994 mower deck belt replacement for John Deere 42-inch decks with maintenance compatibility chart.
M174994 mower deck belt features and material composition infographic for John Deere lawn mowers.
M174994 mower deck belt replacement for John Deere X330 lawn mower with troubleshooting guide.
BlueStars M174994 mower deck belt comparison chart showing heavy-duty aramid cord construction for John Deere mowers.
M174994 mower deck belt installation guide showing inspection tips for pulleys and tensioner springs.
Lifetime Warranty

[Lifetime Warranty] M174994 Mower Deck Belt Replacement - for 42-inch Deck John Deere X330 X350 X354 X370 Lawn Mower | Heavy-Duty Aramid Cord | 1/2" x 144.8"

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M174994 Mower Deck Belt Replacement - for 42-inch Deck John Deere X330 X350 X354 X370 Lawn Mower | Heavy-Duty Aramid Cord | 1/2" x 144.8"

Key Features

  • Belt Dimensions: 1/2-inch width x 144.8-inch outer circumference
  • Material: Constructed with high-tensile strength aramid fiber cords for enhanced durability and resistance to stretching
  • Function: Transmits power from the engine pulley to the mower deck spindles to rotate the cutting blades

Replaces / Cross-Reference Part Numbers

  • John Deere: M174994

Compatibility & Fitment

  • Brand: John Deere
  • Deck Size: 42-inch Accel Deep (42A) Mower Decks
  • Tractor Models: X330, X350, X354, X370

When to Replace

  • Visible signs of wear such as cracking, fraying, glazing, or splitting
  • Audible squealing or chirping from the mower deck during operation
  • Noticeable decrease in blade speed or cutting performance
  • Belt slipping or failing to engage the blades properly

Installation Tips

  • Always disconnect the spark plug wire before performing maintenance
  • Refer to your lawn tractor's owner's manual for the specific belt routing diagram
  • Ensure the belt is correctly seated in all pulley grooves
  • Verify proper tension after installation; the belt should not be too loose or too tight
  • Reinstall all safety guards and shields before operating the mower

FAQ

M174994 is the mower deck drive belt for John Deere X330, X350, X354, and X370 lawn tractors equipped with the 42-inch mower deck. This belt is specifically designed for the 42-inch deck application and is not compatible with 48-inch or 54-inch decks.
This belt replaces John Deere part number M174994 and is also compatible with the A-M174994 reference. When verifying fitment, ensure you match the deck size, tractor model, and the M174994 part number.
Typical symptoms include poor blade engagement, blades slowing down in thick grass, squealing from the deck area, uneven cutting, excessive belt cracking or glazing, frayed belt edges, or a belt that has stretched enough to slip. If the deck suddenly stops driving while the PTO is engaged, the belt may be broken or have jumped off a pulley.
This is a moderate repair that typically takes 30 to 60 minutes, depending on deck access and whether you choose to remove the deck from the tractor. Common tools required include work gloves, a socket or wrench set, and a breaker bar or belt-routing tool to relieve idler tension. We recommend taking a photo of the old belt routing before removal to ensure correct installation.
Inspect the spindle pulleys, idler pulleys, belt guides, tensioner arm, and spring before fitting the new belt. Spin each pulley by hand to check for rough bearings or wobble. Clean all packed grass from the deck, as debris buildup can overheat the belt and cause tracking problems. If the old belt failed suddenly, inspect the spindle and pulleys for signs of seizure or damage.
Common causes of failure include normal wear, heat, pulley misalignment, weak tensioners, debris packed around pulleys, and bearing drag from worn idlers or spindle assemblies. Belts also wear faster if the deck is regularly engaged at high load, if the underside of the deck is clogged, or if the belt has been slipping due to a loss of tension.