Spindle Assembly 918-04123B for Cub Cadet LT1045 LT1046 46-Inch Deck

Overview

This aftermarket 918-04123B spindle assembly is a replacement-style mower deck spindle assembly for select Cub Cadet 46-inch lawn tractor mower deck applications.

This listing is organized around the 918-04123B / 618-04123B spindle path. Some package options may include additional deck repair components such as blades, an idler pulley, and a deck belt, but the lead replacement path is the spindle assembly.

Key Features

• Aftermarket replacement-style mower deck spindle assembly
• Product Type: Spindle Assembly
• Lead Part Number: 918-04123B
• Also Replaces: 618-04123B
• Common Deck Reference: 46 inch
• Optional package variants may include spindle assemblies, blades, an idler pulley, and deck belt components
• Organized by spindle or mandrel part number first to reduce fitment confusion

Compatible Brands & Model Series

Supplier listing data associates the 918-04123B spindle assembly with select Cub Cadet 46-inch mower deck applications.

Cub Cadet model references found in supplier data include:

• LT1045, 46-inch deck, 2007 and before, model references 13AX11CH709, 13AX11CH710, 13AX11CH712, 13AX11CH756, 13BP11CH709, 13BP11CH710, 13BP11CH756, and 13RX11CH756
• LT1046, 46-inch deck, 2007 and before, model references 13AP11CH709 and 13AP11CH710
• LT1022, 46-inch deck, model references 13AB11CH710 and 13AB11CH712

Verify your part numbers before ordering.

Replaces OEM Part Numbers

• Cub Cadet / MTD: 918-04123B, 618-04123B

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: 918-04123B, 618-04123B
• Outside Blade Numbers: 742-04015, 742P04015, 759-04019, 325-298
• Center Blade Numbers: 742-04016, 742P04016, 759-04020
• Idler Pulley Numbers: 756-04129, 753-08171
• Deck Belt Numbers: 754-04033, 954-04033A

Commonly associated single belt listing: Deck Belt 754-04033

Single Spindle Specifications

• Spindle Part Number: 918-04123B
• Also Replaces: 618-04123B
• Deck Size Reference: 46 inch
• Spindle Height: 163.5 mm / 6.43 inches
• Pulley Outer Diameter: 143 mm / 5.62 inches
• Pulley Inner Width: 16 mm / 0.62 inch

Optional Package Component Specifications

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

• Outside Blade Length: 412.75 mm / 16.25 inches
• Outside Blade Width: 64 mm / 2.51 inches
• Outside Blade Thickness: 6 mm / 0.23 inch
• Outside Blade Mounting Hole Diameter: 20 mm / 0.78 inch
• Outside Blade Finish: Powder coated
• Center Blade Length: 371.5 mm / 14.62 inches
• Center Blade Width: 65 mm / 2.55 inches
• Center Blade Thickness: 6 mm / 0.23 inch
• Center Blade Mounting Hole Diameter: 19.5 mm / 0.76 inch
• Center Blade Finish: Powder coated
• Idler Pulley Outer Diameter: 123.8 mm / 4.87 inches
• Idler Pulley Inner Diameter: 9.6 mm / 0.37 inch
• Idler Pulley Outer Width: 26.4 mm / 1.03 inches
• Idler Pulley Inner Width: 19 mm / 0.74 inch
• Deck Belt Overall Length: 3003.55 mm / 118.25 inches
• Deck Belt Width: 12.9 mm / 0.50 inch
• Deck Belt Height: 8.84 mm / 0.34 inch

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 or belt system is worn, noisy, or no longer tracking correctly
• Original spindle number matches 918-04123B or 618-04123B

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, pulley, 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 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 918-04123B. Supplier data also references 618-04123B in the same spindle path.

Do all package options include blades, an idler pulley, 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 rebuild package.

Can I order by deck size only?

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