Spindle Assembly 918-05078A / 618-05078A for Cub Cadet RZT-L46 46-Inch Deck

Overview

This aftermarket 918-05078A spindle assembly is a replacement-style mower deck spindle assembly for select Cub Cadet, MTD, and related 46-inch mower deck applications.

This listing is organized around the 918-05078A 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: 918-05078A
• Also Replaces: 618-05078A, 918-05078, 618-05078
• 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 918-05078A spindle assembly with select 46-inch Cub Cadet RZT zero-turn mower applications.

Cub Cadet model references found in supplier data include:

• RZT-L46 FAB Honda, 46-inch deck, model references 17AGCACN010, 17AGCACN056, 17BGCACN010, and 17RGCACN010, 2016-2018
• RZT-L46, 46-inch deck, model references 17AFCACT056 and 17AICACT010, 2013-2014
• RZT-LX 46 KW FAB, 46-inch deck, Kawasaki, model references 17AICAXN010, 17AICAXN210, and 17RICAXN010, 2017-2018

Verify your part numbers before ordering.

Replaces OEM Part Numbers

• Cub Cadet / MTD: 918-05078A, 618-05078A, 918-05078, 618-05078

Aftermarket Cross-Reference Numbers

• Supplier cross-reference numbers: 285-167

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: 918-05078A, 618-05078A, 918-05078, 618-05078
• Aftermarket Spindle Cross-Reference: 285-167
• Blade Numbers: 490-110-C131, 742-04244, 742-04244A, 742-04290, 742-04290A, 754-04244, 942-04244, 942-04244A, 942-04290, 942-04290A, OCC-742-04244, 335-757
• Idler Pulley Numbers: 756-05034, 756-05034A
• Deck Belt Numbers: 954-04325, 754-04325

Commonly associated single belt listing: Deck Belt 954-04325

Single Spindle Specifications

• Spindle Part Number: 918-05078A
• Also Replaces: 618-05078A, 918-05078, 618-05078
• Deck Size Reference: 46 inch
• Height: 192.2 mm / 7.56 inches
• Mounting Hole Distance: 124.1 mm / 4.88 inches
• Outer Diameter: 134.4 mm / 5.29 inches
• Material: Aluminum
• Weight: 5 lb 4 oz

Optional Package Component Specifications

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

• Deck Blade Length: 590.5 mm / 23-1/4 inches
• Deck Blade Width: 76.2 mm / 3 inches
• Deck Blade Thickness: 4.16 mm / 0.164 inch
• Deck Blade Mounting Hole Distance: 76.2 mm / 3 inches
• Deck Blade Inner Diameter: 28.5 mm / 1.12 inches
• Deck Blade Center Hole: 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
• Idler Pulley Weight: 1 lb 5.8 oz
• Deck Belt Length: 3162.3 mm / 124.5 inches
• Deck Belt Width: 12.7 mm / 0.5 inch
• Deck Belt Thickness: 8 mm / 0.3 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 918-05078A, 618-05078A, 918-05078, or 618-05078

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 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 part number is 918-05078A. Supplier data also references 618-05078A, 918-05078, 618-05078, and aftermarket cross-reference 285-167.

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 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, and belt path before ordering.