GY21098 AUC15811 GY20454 GY20867 GY20962 Spindle Assembly Fit for 42" 48" Deck John Deere LA100 LA110 LA115 LA120 LA125 LA145 LA105 D110 D130 D125 D140 E140 E130 Lawn Mower Parts 2 Pack

What It Is

This is a replacement spindle assembly for the cutting deck of select John Deere lawn tractors. It houses the bearings and pulley that spin the blade, and this 2-pack is intended for 42" and 48" decks used on residential riding mowers.

Fitment & Compatibility

Check these before buying:

• Deck size: Fits 42" (e.g., LA-series) and 48" (e.g., D100/E100 series) decks. Will not fit 54" decks.
• Model list: LA100, LA110, LA115, LA120, LA125, LA145, LA105, D110, D130, D125, D140, E140, E130. Also fits D100, D110, D120, D125, D130, D140, D150, D155, D160, D170, E100, E110, E120, E130, E140, E150, E160, E170, L100, L110, L120, L130, LA100, LA105, LA110, LA115, LA120, LA125, LA130, LA135, LA140, LA145, LA150, LA155, LA165, LA175.
• OEM cross numbers: Replaces GY21098, AUC15811, GY20454, GY20867, GY20962. Verify your existing spindle has one of these numbers.
• Measurement: Spindle shaft diameter is 5/8". Pulley size is approximately 4.5" (may vary slightly). Measure your deck spindle height to confirm vertical clearance.
• Note: This is an aftermarket part, not OEM John Deere. Quality is generally good, but some users report slight variations in bearing fit compared to OEM.

Key Things to Know

• Quality: Bearings are sealed and pre-greased. Expect 2-3 seasons of residential use under normal conditions.
• Installation: Moderate difficulty. Requires removing the deck, belt, blade, pulley, and old spindle. You’ll need a socket set, torque wrench, and penetrating oil for rusted bolts. No special tools beyond that.
• Common gotcha: The pulley bolt can be very tight (often 45-55 ft-lbs). Use a breaker bar. Re-torque blade bolts to spec (usually 30-40 ft-lbs).
• Tip: Replace all three spindles at once if one fails to avoid uneven wear and vibration. This 2-pack covers two spindles; you’ll need a third single spindle for the remaining position.

Should You Buy It

If you have a compatible John Deere with a 42" or 48" deck and need to replace one or two spindles, this is a solid, cost-effective aftermarket choice at about $20 per spindle. It’s not for heavy commercial use, but for residential mowing it delivers reliable performance. Buy a matching third spindle separately if you’re doing a full deck rebuild.