19 Teeth Steering Sector Pinion Gear Rebuild Kit Replacement for John Deere D100 D105 D110 D120 D130 D140 D150 D160 D170 Series Lawn Tractors Replaces GX21924BLE

What It Is

This is a 19-tooth steering sector pinion gear rebuild kit designed to replace the worn-out gear inside the steering gearbox of select John Deere 100-series lawn tractors. It restores smooth, responsive steering on models where the original plastic gear strips or skips.

Fitment & Compatibility

• Confirmed fit: John Deere D100, D105, D110, D120, D130, D140, D150, D160, D170 series lawn tractors (typically with 42"–54" decks).
• OEM cross-reference: Replaces GX21924BLE (original plastic gear) and GX20072 (older metal version).
• What to check before buying:
  • Verify your tractor’s model number (stamped on the frame near the left front wheel or under the seat).
  • Measure the gear shaft diameter (should be 0.5") and tooth count (must be 19 teeth).
  • If your steering box uses a different tooth count (e.g., 20 teeth on some X300 series), this kit will not fit.
  • This is an aftermarket part; it may differ slightly from OEM plastic gears in material (metal vs. plastic) but is a direct swap.

Key Things to Know

• Material upgrade: The kit includes a metal gear (often steel or hardened alloy) instead of the original plastic, which typically fails after 1–3 seasons. This should last significantly longer.
• Installation difficulty: Moderate. Requires removing the steering wheel, dash panel, and gearbox cover. You’ll need basic hand tools (socket set, screwdrivers, and possibly a puller for the steering wheel). Budget 1–2 hours.
• Common gotcha: The kit may include bushings, washers, or a new shaft. If your old shaft is worn or bent, replace it too—otherwise the new gear can wear unevenly.
• Lubrication: Apply a high-quality grease (e.g., John Deere #AN102562 or equivalent) to the gear teeth and bushings during reassembly. Do not use oil—it will run out.

Should You Buy It

If you have a John Deere D100–D170 series tractor with loose, skipping, or unresponsive steering, this kit is a cost-effective fix (under $25 vs. $80+ for a new gearbox). It’s ideal for DIYers comfortable with moderate disassembly. Avoid if your steering box housing is cracked or if you need a complete gearbox replacement.