M154897 / M172924 Primary Deck Belt for John Deere X300 X320 X500 | 66.5 Inch

Overview

This aftermarket M154897 / M172924 primary mower deck belt fits select John Deere X300-Series and X500-Series mower-deck applications using the listed replacement belt-number path.

The supplier lists this polyester replacement belt at approximately 5/8 inch wide by 66.5 inches long.

On compatible two-belt mower decks, M154897 / M172924 is commonly used as the primary belt that transfers power from the engine-mounted PTO clutch to the mower deck. A separate secondary belt may drive the spindle-pulley system.

Key Features

• Aftermarket primary mower-deck drive belt
• Primary Replacement Number: M154897
• Additional Replacement Number: M172924
• Supplier Reference: BT447A1001HH
• Supplier-Listed Width: Approximately 5/8 inch
• Supplier-Listed Length: Approximately 66.5 inches
• Supplier Metric Length: 1689.1 mm
• Supplier-Listed Thickness: 14.5 mm / approximately 0.57 inch
• Material: Polyester
• Color: Black
• Quantity Included: One belt
• Used on select 42-inch, 42M, 48-inch, and 54-inch mower-deck configurations

Replaces These Belt Numbers

• M154897
• M172924

Supplier Reference Number

• BT447A1001HH

Search-Friendly Number Formats

• M154897
• 154897
• M172924
• 172924
• BT447A1001HH

Belt Specifications

• Component: Primary mower-deck drive belt
• Supplier-Listed Length: 66.5 inches
• Supplier Metric Length: 1689.1 mm
• Supplier-Listed Width: 5/8 inch
• Supplier-Listed Thickness: 14.5 mm / approximately 0.57 inch
• Material: Polyester
• Color: Black
• Quantity: One belt

Published belt measurements can vary depending on the measurement method. Use the original M154897 or M172924 part number as the primary fitment check rather than relying on a tape measurement alone.

Compatible John Deere Model Families

The supplier associates the M154897 / M172924 belt path with select mower-deck configurations in the following John Deere model families.

John Deere X300 Series

• X300
• X304
• X310
• X320
• X340
• X360

John Deere X500 Series

• X500
• X520
• X530
• X534
• X540
• X590

Fitment note: These are supplier-provided model-family examples. This belt fits only the specific deck sizes, serial ranges, and belt-routing configurations that use M154897 or M172924.

Compatible Deck Paths

The supplier fitment data includes selected applications using:

• 42-inch mower decks
• 42M dedicated mulching decks
• 48-inch mower decks
• 54-inch mower decks

The same tractor model may have been sold with more than one mower-deck configuration. Deck width alone does not confirm belt fitment.

Primary Belt Position

Many compatible John Deere three-spindle mower decks use two separate belts:

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

M154897 / M172924 is commonly used in the primary clutch-to-deck position on compatible two-belt mower decks.

This listing includes the M154897 / M172924 belt only. It does not include a secondary spindle-drive belt.

John Deere X300, X304 and X310 Fitment Note

The supplier associates M154897 / M172924 with select mower-deck configurations on the John Deere X300, X304, and X310.

These tractors can use different belts depending on the installed 42-inch, 42M, or other compatible mower deck. Confirm that the original primary belt is marked M154897 or M172924.

Do not substitute this belt for M154621 or another long spindle-drive belt simply because the tractor belongs to the X300 Series.

John Deere X320 Fitment Note

The M154897 / M172924 belt is used as the primary deck-drive belt on select John Deere X320 mower-deck configurations.

On a compatible 48X two-belt deck, the mower may use:

• M154897 / M172924: Primary PTO-clutch-to-deck belt
• M154958: Separate secondary spindle-drive belt

On a compatible 54X deck, M154897 / M172924 can also be used in the primary position with a different secondary belt.

Confirm the installed deck, gauge-wheel configuration, original belt numbers, and routing before ordering.

John Deere X340 and X360 Fitment Note

The supplier associates this belt with select 42-inch, 48-inch, and 54-inch deck configurations used on the John Deere X340 and X360.

Production and serial changes can affect the complete deck-belt path. Match the original M154897 or M172924 number instead of relying only on the tractor model and deck width.

John Deere X500-Series Fitment Note

The supplier associates M154897 / M172924 with select mower-deck configurations on the following tractors:

• X500
• X520
• X530
• X534
• X540
• X590

These tractors were offered with multiple 48-inch and 54-inch mower-deck configurations. Some use separate primary and secondary belts, and serial-number changes may affect the complete belt path.

Confirm that the belt being replaced is the short primary deck-drive belt and that the original number matches M154897 or M172924.

Before Ordering

Confirm all of the following before ordering:

• The original belt number is M154897 or M172924.
• The mower is equipped with a compatible John Deere mower deck.
• The required belt is the primary mower-deck drive belt.
• The supplier-listed size of approximately 5/8 inch by 66.5 inches matches the required belt path.
• The belt is not being confused with the longer secondary spindle-drive belt.
• The belt is not the tractor traction-drive belt.
• The installed deck size and belt-routing configuration match the original setup.
• Any applicable mower or deck serial range has been checked.
• The PTO clutch pulley, deck input pulley, idlers, tension spring, and belt guides are in usable condition.

Do not install the belt until the replacement number, belt position, dimensions, and pulley routing have been confirmed.

Common Symptoms of a Worn Primary Deck Belt

• PTO clutch engages but the mower-deck input pulley does not turn
• Secondary belt and blades turn slowly under mowing 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
• Burning-rubber smell near the engine or front of the mower deck
• Intermittent blade engagement even though the PTO clutch operates

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 existing 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 the idler pulleys, tension spring, tension arm, and belt guides.
• Confirm the V-shaped side and flat side of the belt contact the correct pulleys.
• Make sure the replacement belt is fully seated in every pulley groove.
• Rotate the 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 primary and secondary belt-position notes
• Practical support when you need help checking compatibility

FAQ

What does the M154897 belt replace?

The supplier cross-references this aftermarket belt to John Deere numbers M154897 and M172924.

Is M154897 the same replacement path as M172924?

Yes. This supplier belt is listed as a replacement for both M154897 and M172924 when the mower-deck configuration and dimensions match.

How long is the supplier-listed M154897 belt?

The supplier lists the belt at approximately 66.5 inches long.

How wide is the supplier-listed M154897 belt?

The supplier lists the belt at approximately 5/8 inch wide.

What material is the belt made from?

The supplier describes the replacement belt as being made from polyester.

How many belts are included?

This listing includes one M154897 / M172924 belt.

Is M154897 a primary or secondary deck belt?

On many compatible two-belt John Deere mower decks, M154897 / M172924 is used as the primary belt between the PTO clutch and mower deck.

Does this listing include the secondary deck belt?

No. This listing includes the M154897 / M172924 primary belt only. A separate secondary spindle-drive belt may be required.

Does M154897 fit the John Deere X300?

The supplier associates this belt with select X300 mower-deck configurations. Confirm the original M154897 or M172924 number before ordering.

Does M154897 fit the John Deere X304?

It fits select X304 mower-deck configurations listed by the supplier. Match the original belt number, deck type, and applicable serial range.

Does M154897 fit the John Deere X310?

The supplier associates this belt with select X310 deck configurations. Confirm that the required belt is the short primary deck-drive belt.

Does M154897 fit the John Deere X320?

It fits select X320 48-inch and 54-inch mower-deck paths using M154897 or M172924 as the primary belt.

Does M154897 fit the John Deere X340?

The supplier lists select X340 42-inch, 48-inch, and 54-inch deck configurations. Production and serial changes make the original belt number important.

Does M154897 fit the John Deere X360?

The supplier associates the belt with select X360 42-inch, 48-inch, and 54-inch deck configurations.

Does this belt fit the John Deere X500 Series?

The supplier lists select X500, X520, X530, X534, X540, and X590 mower-deck configurations. Not every deck within those model families uses this belt.

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 mower model?

No. Confirm the original belt number, deck size, belt position, serial range when applicable, dimensions, and pulley routing before ordering.

Related John Deere Parts and Guides

• AM141536 PTO Clutch Replacement
• M154958 / M110313 Secondary Deck Belt
• AM136733 / AM137483 Spindle Assembly
• John Deere X320 Quick Reference

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