Spindle Assembly 618-04125 / 918-04125 for Cub Cadet 50 & 54 Inch Decks | Replaces 918-04126B

Overview

This aftermarket 618-04125 / 918-04125 spindle assembly is a replacement-style mower deck spindle assembly for select Cub Cadet, MTD, Troy-Bilt, White Outdoor, and related MTD-built mower deck applications.

This listing is organized around the 618-04125 / 918-04125 spindle path. Some package options may include additional deck repair components such as blades, idler pulleys, and a deck belt, but the lead replacement path is the spindle assembly.

Key Features

• Aftermarket replacement-style mower deck spindle assembly with pulley
• Product Type: Spindle Assembly
• Lead Part Numbers: 618-04125, 918-04125
• Also Replaces: 618-04125A, 618-04125B, 618-04125C, 618-04126, 618-04126A, 918-04125A, 918-04125B, 918-04125C, 918-04126, 918-04126A, 918-04126B
• Common Deck References: 50 inch and 54 inch mower deck paths
• Optional package variants may include spindle assemblies, blades, idler pulleys, and deck belt components
• Organized by spindle or mandrel part number first to reduce fitment confusion

Compatible Brands & Model Series

This 618-04125 / 918-04125 spindle assembly is used on select MTD-built mower deck applications. The detailed package data for this listing is strongest around Cub Cadet LTX1050 50-inch decks, with broader 50-inch and 54-inch RZT, LTX, and GTX-style paths referenced in the replacement-number family.

Cub Cadet 50-inch LTX1050 model references include:

• LTX 1050 KH, 50-inch lawn tractor, model 13AQ93AP010, 2014
• LTX 1050 KH, 50-inch lawn tractor, model 13AQ93AP056, 2014
• LTX 1050 KH, 50-inch lawn tractor, model 13WQ93AP009, 2014
• LTX 1050 KH, 50-inch lawn tractor, model 13WQ93AP010, 2014

Additional mower deck paths may include:

• Cub Cadet LTX, GTX, and RZT mower deck applications using the listed 618 / 918 spindle numbers
• MTD, Troy-Bilt, White Outdoor, and related MTD-built 50-inch and 54-inch deck applications using the same spindle family

Verify your part numbers before ordering.

Replaces OEM Part Numbers

• MTD / Cub Cadet / Troy-Bilt / White Outdoor: 618-04125, 618-04125A, 618-04125B, 618-04125C, 618-04126, 618-04126A, 918-04125, 918-04125A, 918-04125B, 918-04125C, 918-04126, 918-04126A, 918-04126B

Aftermarket Cross-Reference Numbers

• Spindle Cross-References: 285-867, 1120370
• Blade Cross-References: SPM199562627, 112-0316, 335-959
• Idler Pulley Cross-Reference: 280-242

Optional Package Part Number Breakdown

Part numbers below may apply to available package options. Not every package includes every component listed. Select the option that matches the parts needed for your repair.

• Spindle / Mandrel Numbers: 618-04125, 618-04125A, 618-04125B, 618-04125C, 618-04126, 618-04126A, 918-04125, 918-04125A, 918-04125B, 918-04125C, 918-04126, 918-04126A, 918-04126B
• Aftermarket Spindle Cross-References: 285-867, 1120370
• Blade Numbers: SPM199562627, 742-04053, 742-04053A, 742-04053B, 742-04053C, 742-04056, 742-04056A, 742-04056A-0637, 742-04056B, 742-04056B-0637, 742-04056C, 742-04056C-0637, 942-04053, 942-04053A, 942-04053B, 942-04053C, 942-04053H, 942-04056, 942-04056A, 942-04056C, 490-110-C123, 490-110-M126, 112-0316, 335-959
• Idler Pulley Numbers: 756-05034, 756-05034A, AUC17621, GY20110, GY20629, GY22082, 280-242
• Deck Belt Numbers: 4171677, 4147716, 754-04077, 954-04077, 754-04077A, 954-04077A, OCC-754-04077, 490-501-M021, 07200712, 07200810, 112-0332, 07234600
• Undashed Belt References: 75404077, 95404077, 95404077A

Single Spindle Specifications

• Spindle Part Number: 618-04125
• Also Replaces: 918-04125, 618-04125A, 618-04125B, 618-04125C, 618-04126, 618-04126A, 918-04125A, 918-04125B, 918-04125C, 918-04126, 918-04126A, 918-04126B
• Deck Size References: 50 inch and 54 inch
• Spindle Height: 162 mm / 6.37 inches
• Spindle Outer Diameter: 146 mm / 5.74 inches
• Mounting Hole Distance: 90.4 mm / 3.55 inches

Optional Package Component Specifications

The following specifications apply to optional package variants that include blades, idler pulleys, or a deck belt.

• Blade Length: 450.85 mm / 17-3/4 inches
• Blade Width: 63.5 mm / 2.5 inches
• Blade Thickness: 4.30 mm / 0.169 inch
• Blade Center Hole Reference: 25.4 mm / 1 inch, 6-point star
• Idler Pulley Width: 43 mm / 1.69 inches
• Idler Pulley Inner Diameter: 17 mm / 0.67 inch
• Idler Pulley Outer Diameter: 133 mm / 5.23 inches
• Deck Belt Overall Length: 3403.6 mm / 134 inches
• Deck Belt Width: 15.9 mm / 0.62 inch
• Deck Belt Height: 13.22 mm / 0.52 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, blade, idler, or belt system is worn, damaged, or no longer tracking correctly
• Original spindle number matches one of the listed 618 / 918 replacement numbers

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, idler pulley, and belt references for package variants
• U.S.-focused fulfillment options for faster delivery when available

Need a Custom Package?

Need a different combination of parts? Email us the part type and part numbers you need, such as spindle assemblies, blades, belts, pulleys, reinforcement rings, bearings, or hardware. We can review the part-number path and quote a custom package when available.

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 numbers are 618-04125 and 918-04125. This listing also references related 618 / 918 replacement numbers in the same spindle path.

Do all package options include blades, idler pulleys, 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 repair 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, blade path, and belt path before ordering.