42-Inch Deck Rebuild Kit for John Deere L100, L108, L110, L111 & L118 | GX20072 Belt

Overview

This 42-inch deck rebuild kit is built for select John Deere L100, L108, L110, L111, and L118 mower decks using the listed belt, blade, spindle, and idler pulley replacement numbers.

The kit includes the main wear parts commonly replaced during a mower deck refresh: 2 spindle assemblies, 2 mower blades, 2 idler pulleys, and 1 deck drive belt.

This is a good option when your John Deere 42-inch mower deck has noisy spindle bearings, worn blades, slipping belt issues, noisy idler pulleys, uneven cut quality, deck vibration, or multiple deck parts that need to be replaced at the same time.

Important: Match your mower model, deck size, blade count, and original deck part numbers before ordering. Several John Deere 42-inch decks use the same or similar belt numbers but different spindle and blade combinations.

Kit Includes

• 2 spindle assemblies with grease fittings
• 2 mower blades
• 1 flat idler pulley
• 1 steel flat idler pulley with flanges
• 1 deck drive belt

Compatible Brands & Model Series

This deck rebuild kit is intended for select John Deere 42-inch mower decks using the listed replacement part numbers.

• John Deere L-Series: select L100, L108, L110, L111, and L118 42-inch deck applications
• John Deere part-number path: select applications using the GY20050 spindle, GX20249 blade, GX20072 belt, and listed idler pulley numbers

Fitment note: Model names are provided as fitment clues. Always confirm your original belt, blade, spindle, and idler pulley numbers before ordering.

Fits Select John Deere Models

• John Deere L100
• John Deere L108
• John Deere L110
• John Deere L111
• John Deere L118

Model note: Do not assume this kit fits every John Deere 42-inch deck. Later D-Series, LA-Series, and 100-Series decks may use different spindle and blade paths.

Replaces Common Deck Belt Numbers

• John Deere: GX20072, GY20570
• Additional Supplier References: SPM215471655, 754-04219

Belt Size: 1/2 inch x 103-3/4 inches

Belt note: Supplier data lists this as an aramid deck belt and gives the length as 103.75 inches. Match your original belt number and belt length before ordering.

Replaces Common Blade Numbers

• John Deere: GX20249, GX20433, GY20567
• Additional References: 10635, Windsor 50-3036

Blade Specs: 21-1/2 inch blade, 2-1/2 inch width, .156 inch thickness, 11/16 inch center hole, 13/32 inch outer holes, 3-3/4 inch center-to-center outer hole spacing.

Blade note: This kit uses two blades for select 42-inch L-Series decks. Confirm your original blade number, blade length, center hole style, and blade count before ordering.

Replaces Common Spindle Assembly Numbers

• John Deere: GY20050, GY20785, GX20152

Spindle note: This kit uses the GY20050 / GY20785 spindle path for select older John Deere L-Series 42-inch decks. Do not confuse it with similar 42-inch John Deere kits using the GY20454 / GY20867 / GY20962 spindle path.

Replaces Common Idler Pulley Numbers

Flat Idler Pulley

• John Deere: GY20067, GY22172

Flat Idler Specs: 3-5/8 inch OD, 11/16 inch ID, 1-3/16 inch height.

Steel Flat Idler Pulley with Flanges

• John Deere: GY20110, GY20629, GY22082
• Additional Reference: 756-05034

Flanged Idler Specs: 5-1/4 inch OD including flanges, 11/16 inch ID, 1-3/4 inch height.

Idler note: This kit includes two different idler pulley styles. Confirm pulley locations, pulley sizes, and belt routing before ordering.

Before Ordering

Before ordering this 42-inch deck rebuild kit, confirm:

• Your mower uses a 42-inch 2-blade deck
• Your mower is a John Deere L100, L108, L110, L111, or L118 model using the listed deck part-number path
• Your original belt number matches GX20072 or GY20570
• Your blade numbers match the GX20249 / GX20433 / GY20567 blade path
• Your spindle numbers match the GY20050 / GY20785 spindle path
• Your idler pulleys match the listed GY20067 and GY20110 / GY20629 idler pulley paths
• Your deck shell, belt guides, idler arms, spindle mounting holes, and tension system are in usable condition

Do not install parts until fitment is confirmed. Installed deck parts may not be eligible for return.

Common Symptoms This Kit Helps Fix

• Noisy spindle bearings
• Deck vibration
• Uneven cut quality
• Dull, bent, cracked, or worn blades
• Deck belt slipping, squealing, or jumping off
• Noisy or loose idler pulleys
• Blade wobble or bearing play
• Multiple deck parts worn at the same time

Installation Notes

• Park the mower on a level surface and disconnect the spark plug before working on the deck
• Take photos of the belt routing before removing old parts
• Inspect the deck shell for cracks, wallowed holes, rust damage, or bent mounting areas
• Check spindle mounting bolts, blade bolts, washers, belt guides, idler arms, pulleys, and tension springs
• Compare the new parts to your original parts before installation
• Confirm both idler pulleys are installed in the correct locations before routing the belt
• After installation, rotate the blades by hand with the mower off to confirm there is no contact or binding
• Test the mower at low speed first and listen for vibration, belt tracking issues, squealing, or unusual noise

Why Buy From PTO Direct USA?

• Fast USA shipping
• Fitment-first product descriptions
• Clear part-number routing for mower deck repairs
• Deck parts organized by belts, blades, spindles, pulleys, and rebuild kits
• Support for homeowners, repair shops, and mower owners

Need Help Confirming Fitment?

If you are unsure whether this kit fits your mower, send us your mower model number, deck size, blade count, and photos of your original belt, blades, spindle assemblies, idler pulleys, mower deck, and mower ID tag before ordering.

FAQ

Does this fit John Deere L100?

Yes, this kit is listed for select John Deere L100 42-inch deck applications using the listed GX20072 belt, GX20249 blade, GY20050 spindle, and idler pulley paths. Confirm your original part numbers before ordering.

Does this fit John Deere L108, L110, L111, or L118?

Yes, this kit is listed for select John Deere L108, L110, L111, and L118 42-inch deck applications using the listed replacement numbers.

What belt comes in this kit?

This kit includes a deck belt replacing GX20072 and GY20570. The listed belt size is 1/2 inch x 103-3/4 inches.

What blades come in this kit?

This kit includes two blades replacing the GX20249 / GX20433 / GY20567 blade path. The blades are listed as 21-1/2 inches long.

What spindle numbers does this kit replace?

This kit includes two spindle assemblies replacing GY20050, GY20785, and GX20152.

What idler pulleys are included?

This kit includes one flat idler pulley replacing GY20067 / GY22172 and one steel flat idler pulley with flanges replacing GY20110 / GY20629.

Is this the same as the John Deere D100 or D110 42-inch deck kit?

No. This kit shares the GX20072 / GY20570 belt path with some later John Deere 42-inch kits, but it uses the older GY20050 / GY20785 spindle path and GX20249 / GY20567 blade path.

How many blades and spindles are included?

This kit includes 2 mower blades, 2 spindle assemblies, 2 idler pulleys, and 1 deck belt.

Can I order this kit by mower appearance?

No. Do not order by appearance alone. Match your mower model, deck size, blade count, belt number, blade number, spindle number, idler pulley numbers, and deck layout whenever possible.

Need individual deck parts instead? Browse mower deck belts, mower blades, spindle assemblies, and deck pulleys and idlers.

Need a different deck setup? Browse the full mower deck parts catalog.