Spindle Assembly 918-06989 91806989 618-06989 61806989 fits for MTD Troy-Bilt

Spindle Assembly for MTD Troy-Bilt

This spindle assembly replaces OEM cross-reference numbers 918-06989, 91806989, 618-06989, and 61806989, serving as the rotating hub that carries the blade under the deck on compatible mowers.

Overview

This spindle assembly is a direct-fit replacement for the 918-06989 and 618-06989 deck spindle used across many MTD and Troy-Bilt riding mowers. It houses the bearings that let the blade spin freely at cutting speed, restoring a smooth, even cut when an old spindle starts to grind or wobble. It is made for owners doing their own deck repairs and small engine shops servicing these machines.

Built For Performance

• Cross-references OEM part numbers 918-06989, 91806989, 618-06989, and 61806989
• Houses sealed bearings that keep the blade spinning true under load
• Machined housing designed to seat cleanly on the deck surface
• Accepts standard mower blades and mounting hardware for the listed decks
• Suits both replacement and preventive maintenance work

Fits These Machines

• for MTD riding mowers using spindle 918-06989 or 618-06989
• for Troy-Bilt riding mowers using spindle 918-06989 or 618-06989

On-The-Job Use

• Replacing a worn or noisy deck spindle on a riding mower
• Restoring an even cut after blade wobble or vibration
• Routine deck maintenance before the mowing season
• Shop repairs on MTD and Troy-Bilt decks

Specs At A Glance

Good To Know

Q: How do I know if my spindle needs replacing? A: Grinding noise, blade wobble, or an uneven cut usually point to worn spindle bearings. Spin the blade by hand with the engine off and check for play or roughness before ordering.

Q: Do I need to replace both spindles at once? A: If both spindles have similar hours, replacing them together saves a second teardown. If only one is noisy, replacing just the failed spindle is fine.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.