SCITOO New Electric Lawnmower, PTO Clutch Fit for Grasshopper: 388740 / for Woods: 388740 / for Warner: 5218-165, 5218-225 / for Stens: 255-865

What It Is

This is an electric PTO (Power Take-Off) clutch that engages and disengages the mower blades on zero-turn mowers. It’s designed as a direct-fit replacement for Grasshopper and Woods mowers using OEM part 388740, and compatible with Warner/Stens clutch numbers listed.

Fitment & Compatibility

Before buying, confirm your mower’s model and deck size. This clutch fits Grasshopper models with the 388740 OEM clutch—commonly found on 48”, 52”, and 61” decks from the mid-2000s onward. For Woods mowers, it replaces the same 388740 part. It also cross-references to Warner 5218-165 and 5218-225, and Stens 255-865.

Critical checks:

• Measure the shaft diameter (typically 1” or 1-1/8”) and bolt pattern (3-bolt or 4-bolt). This clutch uses a 1” shaft with a 4-bolt pattern—verify yours matches.
• Confirm your mower’s electrical connector type (flat 2-pin or round 2-pin). This clutch comes with a flat 2-pin connector; adapters may be needed for round connectors.
• Check overall clutch thickness (about 2.5”) to ensure clearance inside your mower deck.

Key Things to Know

• Build quality: SCITOO is an aftermarket brand. Expect decent performance for the price, but not OEM durability. Some users report shorter lifespan (1-2 seasons) under heavy use.
• Installation difficulty: Moderate. You’ll need basic tools (wrenches, multimeter) and mechanical experience. The clutch must be properly gapped (0.010”–0.015” air gap) to engage correctly.
• Common gotchas: The included wiring harness may not match your mower’s connector—be prepared to splice or buy an adapter. Also, the clutch may run slightly hotter than OEM; ensure good airflow around it.
• Noise: A few users note a slight whine during engagement; this is normal for aftermarket clutches.

Should You Buy It

This is a solid budget option if you’re handy and need a quick replacement for an older Grasshopper or Woods zero-turn. It works well for light-to-moderate residential use but may not hold up under daily commercial mowing. If you need maximum reliability, stick with OEM or a premium aftermarket brand.