POSEAGLE spindle assembly kit for John Deere D105/D110/D130 — 2-pack GY21098 with pulleys & 103" belt

POSEAGLE's 2-piece GY21098 spindle assembly kit restores smooth, reliable deck rotation for John Deere 42" mower decks by replacing worn spindles, pulleys, and belt with precision-machined components and a grease coupler for easy lubrication.

If your John Deere D100-series or similar 42-inch deck is showing uneven cuts, noisy spindles, or excessive blade wear, replacing the spindle assembly often fixes the problem. This comprehensive kit includes two spindle assemblies that match John Deere part GY21098, compatible pulleys and a 103" belt replacement, plus a double-handle grease gun coupler so you can lubricate the new spindles immediately for longer life.

How does this kit improve deck performance?

Worn spindle bearings and damaged pulleys create vibration, uneven blade motion, and poor cutting results. Installing these precision CNC-machined spindles and matched pulleys restores concentric rotation and reduces friction so blades run truer and cut more evenly.

• Two high-quality aluminum-alloy spindles engineered to match OEM fit and function
• Pulley replacements sized to John Deere GX20367 / UC23728 specifications
• Included 1/2" x 103" belt (GX20072 equivalent) for correct tension and tracking

What parts are included and what do they replace?

The kit replaces multiple John Deere part numbers so you don’t have to source individual components. You receive spindle assemblies that substitute for GY21098 and related kits, pulleys that match GX20367/UC23728, and a belt equivalent to GX20072/A103.

• 2 × spindle assemblies (replaces John Deere GY21098 and AUC15811 references)
• 2 × pulleys (7.0" OD, 0.83" height, 0.6" bore to replace GX20367/UC23728)
• 1 × 1/2" × 103" replacement belt (GX20072 / A103 equivalent)
• 1 × double-handle grease gun coupler with 11.8" hose for easy lubrication

Are these spindles durable and easy to install?

POSEAGLE manufactures the spindles from premium aluminum alloy with steel grease zerks and Grade 5 screws to resist wear. CNC machining ensures smooth threads and accurate fits so bolts and nuts align without binding, making installation straightforward for anyone comfortable with basic mower maintenance.

• Premium aluminum alloy housings plus steel zerk fittings for routine greasing
• Grade 5 fasteners and precision threads to prevent galling during assembly
• Includes grease coupler so spindles can be lubricated before first use

Which John Deere models will this kit fit?

This spindle kit targets 42-inch mower decks used across many John Deere lawn tractor models. Confirm fit by deck size and part numbers, but the kit supports a broad list of D100, E100, LA, S and X series machines that use the GY21098 spindle family.

• Designed for 42" decks: 102, 105, 107S, 115, 125, 135 and related models
• Compatible with D100, D105, D110, D120, D125, D130 and E100–E130 series
• Also fits LA100–LA135, S100–S120 and select X-series decks listed in product fitment

Who is this for? This kit is aimed at homeowners and small-property caretakers who perform their own mower maintenance and need a reliable, OEM-compatible spindle replacement set. It's also useful for small repair shops and landscapers who want a complete, cost-effective rebuild option for 42" John Deere decks—especially when spindles are noisy, blades wobble, or the deck belt slips. The included grease coupler lets you lubricate new spindles immediately, helping ensure optimal performance and longer component life.