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Description
30138800 Spindle Assembly – Ariens / Gravely Genuine OEM Aluminum Spindle Sub
The Ariens / Gravely 30138800 Aluminum Spindle Assembly is a genuine OEM replacement spindle sub-assembly designed for zero-turn mower cutting decks. This heavy-duty aluminum spindle supports smooth blade rotation, proper belt engagement, and reliable cutting performance.
Commonly used on Ariens and Gravely ZT X and ZT XL series mowers, this spindle assembly is an essential replacement part for worn, noisy, or damaged deck spindle systems.
Product Details
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Part Number: 30138800
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Brand: Ariens / Gravely
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Part Type: Aluminum Spindle Assembly (Spindle Sub)
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Application: Mower Deck Spindle
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OEM Status: Genuine Ariens / Gravely OEM Replacement Part
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Condition: New
Function
The Ariens / Gravely 30138800 spindle assembly is designed to:
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Support mower blade rotation on the cutting deck
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Maintain smooth, consistent cutting performance
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Reduce vibration and improve deck reliability
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Replace worn or damaged spindle housings and bearings
Compatibility
This spindle assembly fits Ariens / Gravely zero-turn mower decks, including:
Ariens ZT X Series
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ZT X 42" (Models 918007, 918008)
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ZT X 48" (Model 918009)
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ZT X 52" (Models 918010, 918011)
Ariens ZT XL Series
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ZT XL 42" (Model 918012)
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ZT XL 48" (Model 918013)
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ZT XL 52" (Models 918014, 918015)
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ZT XL 60" (Model 918016)
Used in deck sections such as:
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Deck, Belts, Blades and Spindles
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Deck, Belt, Baffles, Blades and Spindles
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Quick Reference Service Parts
⚠️ Always confirm your mower model and deck size before ordering to ensure correct fitment.
Installation / Usage
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Remove the mower deck and disconnect the belt
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Remove the damaged spindle assembly
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Install the new 30138800 spindle sub-assembly
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Reinstall the blade, belt, and deck components
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Check proper belt tension and blade alignment before operation
Maintenance Tips
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Inspect spindles regularly for noise or vibration
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Keep the deck clean to prevent premature bearing wear
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Replace spindle assemblies if blades wobble or cut unevenly
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Torque mounting hardware to manufacturer specifications


