Spindle Assembly 918-06991 with Pulley and Reinforcement Ring for Troy-Bilt MTD 42-Inch Deck

Overview

This aftermarket 918-06991 spindle assembly with pulley and optional deck spindle reinforcement ring is a replacement-style mower deck spindle assembly for select MTD and Troy-Bilt 42-inch riding mower deck applications.

Supplier listing data associates this spindle path with Troy-Bilt Pony, Bronco, and TB42 model references using the 918-06991 / 618-06991 spindle assembly path.

Verify your part numbers before ordering.

Key Features

• Aftermarket replacement-style mower deck spindle assembly with pulley
• Product Type: Spindle Assembly
• Lead Part Number: 918-06991
• Also Replaces: 618-06991
• Common Deck Reference: 42 inch
• Outer Pulley Diameter: 5.81 inches
• Organized by spindle or mandrel part number first to reduce fitment confusion

Compatible Brands & Model Series

Supplier listing data associates this 918-06991 spindle assembly with select MTD and Troy-Bilt 42-inch mower deck applications.

MTD / Troy-Bilt model references found in supplier data include:

• 13A277KS066 TB42 7-Speed, 2015
• 13A879KS066 TB42, 2017
• 13A879KS066 TB42 Hydro, 2015
• 13AM77KS011 Pony, 2014-2016
• 13AM77KS066 TB42, 2014
• 13AN77BS011 Pony, 2017
• 13AV78KS011 Bronco, 2014
• 13AV78KS066 TB42, 2014
• 13WM77KS011 Pony, 2014
• 13WM77KS011 Pony, 2015-2016
• 13WM77KS211 Pony, 2014-2015
• 13WN77BS011 Pony, 2017
• 13WN77BS211 Pony, 2017
• 13WV78KS011 Bronco, 2014-2016
• 13WV78KS211 Bronco, 2014-2015
• 13WX78BS011 Bronco, 2017
• 13WX78BS211 Bronco, 2017
• Bronco 13WV78KS211, 2016
• Pony 13WM77KS211, 2016
• TB42 13AL79KS066, 2016
• TB42 7-Speed 13B277KS066, 2016-2017
• TB42 Hydro Tractor 13A879KS066, 2016

Verify your original spindle number, mower model, deck configuration, and mounting pattern before ordering.

Replaces OEM Part Numbers

• MTD / Troy-Bilt: 918-06991, 618-06991

Specifications

• Spindle Height: 174.5 mm / 6.87 inches
• Mounting Hole Distance: 127 mm / 5.0 inches
• Outer Pulley Diameter: 147.8 mm / 5.81 inches

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 918-06991 or 618-06991

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 and pulley specifications to help reduce ordering errors
• 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 MTD or Troy-Bilt 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 part numbers does this spindle replace?

Supplier listing data references 918-06991 and 618-06991.

Does this listing include the reinforcement ring?

Supplier listing data describes this package as including a spindle assembly with pulley and bolts, plus a deck spindle reinforcement ring with bolts. Verify the selected product option and image before checkout.

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, and mounting pattern before ordering.