Lawn Mower Tractor RZT Hydrostatic Transmission Drive Belt 1/2" x 69.125" Replacement for 754P05874 754-05874 CMXGZAM501089 490-501-C089 Cub Ct Craftsman Troy-Bilt

What It Is

This is a 1/2" x 69.125" hydrostatic transmission drive belt, designed to transfer power from the engine to the hydrostatic pumps on zero-turn (RZT) lawn tractors. It’s a direct replacement for Cub Cadet, Craftsman, and Troy-Bilt models using OEM part numbers 754P05874, 754-05874, CMXGZAM501089, or 490-501-C089.

Fitment & Compatibility

Before buying, verify three things:

• Belt size: Must be exactly 1/2" wide and 69.125" (69 1/8") long. Measure your old belt or check the part number on the side of the belt.
• Machine type: This fits specific RZT (zero-turn) models from Cub Cadet, Craftsman (especially RZT 50, RZT 54), and Troy-Bilt (Mustang series). It does not fit standard lawn tractors or push mowers.
• OEM vs aftermarket: This is a non-OEM replacement. It matches the dimensions and material of the original but may have a slightly different brand stamp. Check your deck size (50" or 54" common) and hydrostatic pump layout—some models use two drive belts, so confirm you need this one.

Key Things to Know

• Quality: Rated 4.5/5 from 76 reviews. Users report it fits well and lasts as long as OEM belts, though a few note it may be slightly thinner than original—check tension after install.
• Installation difficulty: Moderate. You’ll need to remove the deck, release belt tension by loosening the idler pulley, and route the belt around both hydrostatic pump pulleys and the engine pulley. A belt tension gauge helps, but not required.
• Common gotcha: If your mower has a separate deck drive belt, don’t confuse the two. This is only for the transmission/hydrostatic system. Also, check that your pulleys aren’t worn—new belt on old, grooved pulleys can slip or wear prematurely.
• Lubrication tip: Apply a light belt dressing or check for proper pulley alignment after install to reduce squealing.

Should You Buy It

If you need a reliable, cost-effective replacement for the OEM belt on your Cub Cadet, Craftsman, or Troy-Bilt RZT mower, this is a smart buy at $17.88. It’s well-reviewed, fits as specified, and saves you roughly 30–50% over the OEM part. Best for DIY owners comfortable with basic deck removal and belt routing.