Tomanic 19-Tooth Steering Sector Gear Kit for John Deere D100–D170 — Pinion, Bushing & Hardware, Direct Replacement

The Tomanic 19-tooth steering sector gear kit is a direct-replacement repair set built to restore steering on John Deere D-series lawn tractors (D100–D170) with a durable pinion, sector plate, bushing and hardware.

When steering becomes sloppy or noisy on an older John Deere D100–D170 model, replacing worn internal components with a complete rebuild kit can bring back precise control. This kit from Tomanic includes the sector plate, pinion gear, metal bushing and fasteners so you can replace the assembly without hunting down individual parts. It’s designed as a direct fit for the listed D-series models and references the original OEM part numbers for easy verification.

How do I know this kit fits my tractor?

Confirm fitment by checking your tractor model against the list: John Deere D100, D105, D110, D120, D125, D130, D140, D150, D160 and D170. The kit is manufactured to match the original geometry and mounting points so installation does not require modification.

• Fits D100–D170 series models—verify your model before ordering
• Replaces OEM sector plate GX21924BLE
• Replaces OEM pinion GX20053 and bushing GX20054
• Designed for direct replacement—no custom machining

What parts are included and what materials are used?

The kit ships as a single set containing the sector plate, a 19-tooth pinion gear, a metal bushing and the necessary nut and bolt. Components are made from hardened steel with a powder-coated finish on the sector plate to resist corrosion and improve part life under typical lawn-care use.

• 1 sector plate (powder-coated steel) for durability
• 1 19-tooth pinion gear (hardened steel) for accurate meshing
• 1 metal bushing to restore proper shaft clearance
• 1 nut and bolt for secure, ready-to-install assembly

How will replacing these parts affect steering performance?

Installing the new sector gear, pinion and bushing removes wear-related play and tooth deterioration that cause vague or jerky steering. Restoring correct gear engagement returns smoother steering input and improved tracking, particularly at low speeds and while maneuvering around obstacles.

• Reduces free play and steering slop
• Quieter operation with proper gear contact
• Improves directional control for mowing and towing tasks
• Prevents further damage to adjacent steering components

Is this a DIY replacement or should I use a shop?

The kit is intended for owners or mechanics comfortable with basic tractor disassembly and reassembly. Typical tasks include removing the front cover or steering housing, replacing the worn parts, and re-torquing hardware to spec. If you lack the tools or experience with tractor steering systems, a repair shop can complete the swap quickly and safely.

• Suitable for experienced DIYers with hand tools and basic mechanical skills
• Includes all hardware for a single complete repair
• Professional service recommended if unsure about steering safety
• Follow torque and alignment checks after installation

Who is this for: This Tomanic steering sector gear kit is aimed at owners and maintenance technicians of John Deere D-series lawn tractors (D100–D170) who need an OEM-referenced replacement to restore steering precision. It’s useful for seasonal maintenance, refurbishing older machines, and anyone replacing worn steering components to extend the service life of their mower.