Spindle Assembly AM144423 with Pulley for John Deere W48 Z445 Z540R Z545R Z645

Overview

This aftermarket AM144423 spindle assembly with pulley is a replacement-style mower deck spindle assembly for select John Deere commercial walk-behind, ZTrak, Eztrak, and residential zero-turn mower applications.

This listing is organized around the AM144423 spindle assembly as the lead replacement path. Some package variants may include additional deck repair components such as high-lift blades, blade bolts, washers, and a deck belt, but the main fitment path for this listing is the AM144423 spindle assembly.

Verify your part numbers before ordering.

Key Features

• Aftermarket replacement-style mower deck spindle assembly with pulley
• Product Type: Spindle Assembly
• Lead Part Number: AM144423
• Compatible Brand: John Deere
• Common Deck References: 48 inch and 54 inch decks in supplier data
• Optional package variants may include spindle assemblies, blades, bolts, washers, and deck belt components
• Organized by spindle or mandrel part number first to reduce fitment confusion

Compatible Brands & Model Series

Supplier listing data associates this AM144423 spindle assembly with pulley with select John Deere mower deck applications.

Compatible model references found in supplier data include:

• John Deere W48M commercial walk-behind mower, 48-inch deck
• John Deere W48R commercial walk-behind mower, 48-inch deck
• John Deere ZTrak mower, 48-inch deck references
• John Deere Z445 Eztrak residential zero-turn mower, 54-inch deck
• John Deere Z540R
• John Deere Z545R
• John Deere Z645

Verify your original spindle number, mower model, deck size, and pulley setup before ordering.

Replaces OEM Part Numbers

• John Deere: AM144423

Optional Package Part Number Breakdown

Supplier listing data references the following part numbers across available package options. Not every package includes every component listed below. Select the variant package that matches the parts needed for your repair.

• Spindle / Mandrel Numbers: AM144423
• Blade Numbers: TCU30315, TCU14939
• Blade Bolt Numbers: 19M7872, AM130954
• Washer Numbers: M147138
• Deck Belt Numbers: GX25998

Commonly associated single belt listing: Deck Belt GX25998

Single Spindle Specifications

• Spindle Part Number: AM144423
• Height: 183 mm / 7.2 inches
• Outer Diameter: 203 mm / 7.99 inches
• Mounting Hole Distance: 178 mm / 7 inches
• Shaft Outer Diameter: 26.6 mm / 1.04 inches

Optional Package Component Specifications

The following specifications were found in supplier data for optional package variants that include additional deck repair components.

• High Lift Blade Length: 432 mm / 17 inches
• High Lift Blade Thickness: 6.3 mm / 0.24 inch
• High Lift Blade Center Hole Diameter: 22 mm / 0.875 inch
• High Lift Blade Material: Steel
• Blade Bolt Length: 32.7 mm / 1.2 inches
• Blade Bolt Head Diameter: 18 mm / 0.7 inch
• Blade Bolt Thread Size: M12x1.75
• Blade Bolt Material: Iron
• Washer Width: 4.9 mm / 0.19 inch
• Washer Inner Diameter: 12.2 mm / 0.48 inch
• Washer Outer Diameter: 44.7 mm / 1.76 inches
• Washer Material: Steel
• Deck Belt Length: 3870 mm / 152.3 inches
• Deck Belt Width: 15.875 mm / 0.625 inch
• Deck Belt Thickness: 13 mm / 0.51 inch
• Deck Belt Material: Polyester

Common Symptoms / When to Replace

• Mower deck spindle is noisy, loose, seized, or wobbling
• Blade has excessive play at the spindle shaft
• Deck vibration increases during blade engagement
• Pulley is worn, damaged, or no longer tracking the belt correctly
• Original spindle number matches AM144423

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 specifications shown in this listing.

Why Buy From PTO Direct USA

• Fitment-first product organization by replacement part-number path
• Clear spindle, blade, hardware, and belt references for package variants
• U.S.-focused fulfillment options for faster delivery when available

Need Help Confirming Fitment?

Send us your mower model number, deck size, and the part number stamped on your original spindle or mandrel assembly. We can help confirm whether this is the correct replacement path.

FAQ

Is this an OEM John Deere spindle assembly?

No. This is an aftermarket replacement-style spindle assembly intended to replace the listed part-number path when the physical fitment details match.

What is the lead part number for this listing?

The lead spindle part number is AM144423.

Do all package options include blades, bolts, washers, and a belt?

No. Package contents vary by selected option. Use the variant title and product images to confirm whether you are ordering a single spindle assembly or a larger deck repair package.

Can I order by deck size only?

No. Deck size alone is not enough. Match the original spindle number and confirm your mower model, deck size, pulley setup, and belt path before ordering.