GX21833 GX20571 Mower Deck Belt Replacement for John Deere 48" D140 L130 L120 LA145 D160 E140 LA130 E170 D155 S170 E160 S140 Z255 GX20571 145 155C D150 E150 LA140 LA155 Grey Aramid Cord (141" x1/2")

What It Is

This is a 141-inch by 1/2-inch replacement deck belt for 48-inch John Deere lawn tractors and zero-turn mowers. It drives the blades on models like D140, L130, L120, LA145, and several others in the 100 and 155C series.

Fitment & Compatibility

Before buying, confirm your mower has a 48-inch deck. Measure your old belt: it must be exactly 141 inches long and 1/2 inch wide. This belt is an aftermarket match for OEM part numbers GX21833 and GX20571. It fits John Deere models: D140, D150, D155, D160, E140, E150, E160, E170, L120, L130, LA130, LA140, LA145, LA155, S140, S170, Z255, and 155C. Do not use on 42-inch or 54-inch decks—length will be wrong.

Key Things to Know

• Aramid cord construction is stronger than standard rubber, so it resists stretching and snapping better than cheap belts.
• Installation is straightforward on most models: remove the deck, route belt per diagram (follow the idler pulley path), and re-tension. No special tools needed.
• Check your deck pulleys for wobble or rust before installing—a bad pulley will wear a new belt fast.
• Price is very low for aramid cord belt ($9.68), but only 2 reviews so far—long-term durability is unproven.

Should You Buy It

If you need a budget-friendly replacement for a 48-inch John Deere deck and are comfortable with basic installation, this belt is a solid value. It’s best for occasional mowing or light-duty use; for heavy commercial cutting, spring for a premium OEM or Kevlar belt.