M169485 / UC39236 Deck Belt for John Deere X330 X350 X570 X590

Overview

This aftermarket M169485 / UC39236 mower deck drive belt fits select John Deere X300-Series and X500-Series tractors using compatible mower-deck configurations.

The supplier lists this polyester replacement belt at approximately 74-3/4 inches long, 0.60 inch wide, and 0.47 inch thick.

On compatible multi-belt mower decks, M169485 / UC39236 is commonly used as the primary deck-drive belt that transfers power from the PTO clutch to the mower deck. A separate secondary belt may be required to drive the spindle-pulley system.

Important: The supplier associates this belt with select 48-, 54-, and 60-inch mower-deck applications. Not every mower or deck within the listed model families uses the same belt. Match the original belt number before ordering.

Key Features

• Aftermarket mower-deck drive V-belt
• Primary Replacement Number: M169485
• Additional Replacement Number: UC39236
• Supplier Reference: BT476A1001AA
• Supplier-Listed Length: Approximately 74-3/4 inches
• Supplier-Listed Width: Approximately 0.60 inch
• Supplier-Listed Thickness: Approximately 0.47 inch
• Material: Polyester
• Color: Silver
• Quantity Included: One belt
• Used on select John Deere mower-deck drive systems

Replaces These Belt Numbers

• M169485
• UC39236

Supplier Reference Number

• BT476A1001AA

Search-Friendly Number Formats

• M169485
• 169485
• UC39236
• 39236
• BT476A1001AA

Belt Specifications

• Component: Mower-deck drive belt
• Length: Approximately 74-3/4 inches
• Width: Approximately 0.60 inch
• Thickness: Approximately 0.47 inch
• Material: Polyester
• Color: Silver
• Quantity: One belt

Published belt measurements can vary depending on how the belt is positioned and measured. Use the original M169485 or UC39236 part number as the primary fitment check.

Compatible John Deere Models

The supplier associates the M169485 / UC39236 belt with select mower-deck configurations on the following John Deere tractors.

John Deere X300 Series

• X330
• X350
• X354
• X370
• X380
• X384
• X390
• X394

John Deere X500 Series

• X570
• X580
• X584
• X590

Fitment note: These are supplier-provided model examples. This belt fits only the mower-deck and belt-routing configurations using M169485 or UC39236.

Compatible Deck-Size Paths

The supplier associates this belt with select:

• 48-inch mower decks
• 54-inch mower decks
• 60-inch mower decks

Deck width alone does not confirm fitment. The same tractor family may be available with more than one mower-deck size, belt system, or production configuration.

Confirm that the original belt is marked M169485 or UC39236 before ordering.

Primary Deck-Belt Position

Many compatible John Deere mower decks use separate primary and secondary belts:

• The primary deck belt transfers power from the engine-mounted PTO clutch to the mower deck.
• The secondary deck belt routes through the spindle and idler pulleys to turn the mower blades.

M169485 / UC39236 is commonly used in the primary deck-drive position on compatible multi-belt mower decks.

This listing includes one M169485 / UC39236 belt only. It does not include a separate secondary spindle-drive belt.

John Deere X330 Fitment Note

The supplier lists the M169485 / UC39236 belt for select John Deere X330 mower-deck configurations.

The X330 can be equipped with more than one mower-deck type. Confirm that the original primary deck belt is marked M169485 or UC39236 before ordering.

John Deere X350, X354 and X370 Fitment Note

The supplier associates this belt with select X350, X354, and X370 mower-deck applications.

These tractors may use different belt paths according to the installed deck. Match the original belt number, deck size, belt position, and routing rather than ordering from the tractor model alone.

John Deere X380, X384, X390 and X394 Fitment Note

The supplier lists select X380, X384, X390, and X394 mower-deck configurations among the compatible applications.

Confirm that M169485 or UC39236 is the belt being replaced. A separate secondary spindle-drive belt may also be used on compatible decks.

John Deere X570, X580, X584 and X590 Fitment Note

The supplier associates M169485 / UC39236 with select X570, X580, X584, and X590 mower-deck configurations.

These tractor families may use different 48-, 54-, or 60-inch mower decks. Confirm the original belt number and belt position before ordering.

Common Symptoms of a Worn Primary Deck Belt

• PTO clutch engages but the mower deck does not begin turning
• Secondary belt and mower blades turn slowly under cutting load
• Belt squeals when the PTO clutch is activated
• Belt slips between the PTO clutch and mower deck
• Visible cracking, glazing, fraying, or burned belt surfaces
• Belt repeatedly jumps off the clutch or deck input pulley
• Loose belt tension with the tension system engaged
• Burning-rubber smell near the engine or front of the mower deck
• Intermittent blade operation even though the clutch engages

Installation Notes

• Park the tractor on a level surface and remove the ignition key.
• Disconnect the spark-plug leads before working near the PTO clutch or mower deck.
• Photograph or sketch the original belt routing before removal.
• Identify the primary and secondary deck belts before disassembly.
• Inspect the PTO clutch pulley and deck input pulley for wear or damage.
• Inspect all idler pulleys, tension springs, tension arms, and belt guides.
• Confirm that the V-shaped and flat sides of the belt contact the correct pulleys.
• Make sure the replacement belt is completely seated inside every pulley groove.
• Rotate the mower-deck pulley system manually before starting the engine.
• Replace seized pulleys or damaged tension components before operating the new belt.

Quick Ship Fulfillment

This item may ship directly from one of our trusted U.S. distribution partners to help reduce transit time. Packaging, labeling, or warehouse origin may vary, but the part will match the replacement numbers, fitment notes, and supplier specifications shown in this listing.

Why Buy From PTO Direct USA

• Part-number-first listings to help reduce fitment mistakes
• Focused mower-deck and PTO replacement parts
• Clear belt-position and model-fitment notes
• Practical support when you need help checking compatibility

FAQ

What does the M169485 belt replace?

The supplier cross-references this aftermarket belt to John Deere numbers M169485 and UC39236.

Is M169485 the same replacement path as UC39236?

Yes. The supplier lists this belt as a replacement for both M169485 and UC39236 when the mower-deck configuration and dimensions match.

How long is the supplier-listed M169485 belt?

The supplier lists the belt at approximately 74-3/4 inches long.

How wide is the supplier-listed M169485 belt?

The supplier lists the belt at approximately 0.60 inch wide.

How thick is the supplier-listed M169485 belt?

The supplier lists the belt at approximately 0.47 inch thick.

What material is the belt made from?

The supplier describes the belt as a polyester replacement belt.

How many belts are included?

This listing includes one M169485 / UC39236 belt.

Is M169485 a primary or secondary deck belt?

On many compatible multi-belt John Deere mower decks, M169485 / UC39236 is used as the primary deck-drive belt.

Does this listing include the secondary deck belt?

No. This listing includes one M169485 / UC39236 belt only. A separate secondary spindle-drive belt may be required.

Does M169485 fit the John Deere X330?

The supplier associates the belt with select X330 mower-deck configurations. Confirm the original M169485 or UC39236 number before ordering.

Does M169485 fit the John Deere X350?

The supplier lists select X350 mower-deck applications. Match the original belt number and installed deck.

Does M169485 fit the John Deere X380?

The supplier associates this belt with select X380 mower-deck configurations. Confirm the original belt number and belt position.

Does M169485 fit the John Deere X390?

The supplier lists select X390 mower-deck applications using the M169485 / UC39236 belt path.

Does M169485 fit the John Deere X570?

The supplier associates this belt with select X570 mower-deck configurations. Match the original belt number and installed deck before ordering.

Does M169485 fit the John Deere X590?

The supplier lists select X590 mower-deck configurations. Not every deck used on the X590 uses this belt.

Does M169485 fit every 48-, 54-, or 60-inch John Deere deck?

No. The supplier associates the belt with select applications only. Match the original belt number, deck configuration, belt position, dimensions, and pulley routing.

Is this the tractor traction-drive belt?

No. This listing is for a mower-deck drive belt. The traction-drive belt that moves the tractor is a separate part.

Can I order this belt using only the tractor model?

No. Confirm the original M169485 or UC39236 number, installed mower deck, belt position, dimensions, and pulley routing before ordering.

Need a different belt? Browse the full mower deck belts collection.