5/8" x 112 1/2" Lawn Mower Deck Belt for Scag 485805, Cub Cadet 754-3055A, 954-3055A and 2000 Series with 38" and 42" Deck

What It Is

This is a 5/8" wide by 112 1/2" long V-belt that drives the mower deck blades on select Scag and Cub Cadet lawn tractors with 38" or 42" decks. It replaces OEM parts including Scag 485805 and Cub Cadet 754-3055A / 954-3055A.

Fitment & Compatibility

Before buying, confirm your deck is exactly 38" or 42" and that your model uses a single belt for both blades (not a dual-belt setup). This belt fits Cub Cadet 2000 Series tractors (e.g., 2135, 2145, 2150, 2165) with 38" or 42" decks, plus some Scag models using part 485805. Measure your old belt end-to-end (not around pulleys) – it must be 112 1/2" long. If your deck has a different spindle configuration or uses a shorter/longer belt, this won’t work. OEM vs aftermarket: this is a Cub Cadet-branded belt, so it matches OEM specs exactly.

Key Things to Know

• Installation difficulty: Moderate. You’ll need to remove the deck, route the belt around pulleys and tensioner, then reinstall. A belt diagram is essential – check your manual or deck sticker.
• Quality: This is a standard-duty belt, not Kevlar-reinforced. Fine for residential use; commercial mowing may wear it faster.
• Common gotcha: The 112 1/2" length is critical – even 1" off will cause slipping or poor blade engagement. Always measure your old belt.
• Check tensioner: If the belt was slipping, the tensioner spring or pulley may be worn. Replace those if needed to avoid premature belt wear.

Should You Buy It

If you need a direct replacement for a worn belt on a Cub Cadet 2000 Series or compatible Scag with a 38" or 42" deck, this is a solid, OEM-spec choice at a fair price. It’s best for residential mowing where you want a reliable, no-guesswork fit. For heavy commercial use, consider a reinforced belt.