388771 PTO Clutch Replacement for Grasshopper 623T, 722D2 & 928D2 | Warner 5218-226, X0105

Overview

This 388771 PTO clutch replacement is an aftermarket electric PTO clutch for select Grasshopper commercial mower applications, including 700 and 900 Series machines.

This clutch replaces Grasshopper 388771, 388768, and 604183, and cross-references Warner 5218-226, Warner 5218-170, Warner 5218-229, Warner 5218-79, Xtreme X0105, Stens 255-771, Oregon 33-189, and Rotary 11074.

Built with a 1-1/8-inch crankshaft bore, 4-7/8-inch double-groove pulley for two 1/2-inch V-belts, clockwise rotation viewed from the pulley side, and a reverse-mount configuration with the pulley facing toward the engine, this 12V electric PTO clutch is designed for Grasshopper applications using the OEM and manufacturer part-number paths listed below.

Key Features

• Aftermarket electric PTO clutch replacement for listed Grasshopper commercial mower applications
• Crankshaft Bore: 1-1/8" / 1.125"
• Pulley Diameter: 4-7/8" / 4.875"
• Pulley Type: double pulley
• Belt Width: double 1/2" belt setup
• Rotation: CW from pulley side
  
• Mounting Orientation: reverse mount; pulley faces toward the engine when installed
  
• Voltage: 12V DC
• Connector Style: flat side-by-side at clutch or optional wire harness extension to T-plug
• Integrated brake assembly for controlled blade stopping
• Fully assembled and ready to install after fitment verification

Compatible Brands & Models

This PTO clutch fits select Grasshopper FrontMount mowers using the 388771 electric clutch and brake configuration.

Grasshopper Applications

• Grasshopper 620T: 2007-2013
• Grasshopper 623T: 2013-2026
• Grasshopper 721DT: 2008-2020
• Grasshopper 722D2: 2008
• Grasshopper 722DT6: 2008-2009
• Grasshopper 723T: 2008-2013
• Grasshopper 725DT6: 2009-2026
• Grasshopper 725KT: 2014-2026
• Grasshopper 727EFI: 2014-2026
• Grasshopper 727K2: 2008
• Grasshopper 727T6: 2008-2014
• Grasshopper 729BT6: 2008-2024
• Grasshopper 729G2: 2008
• Grasshopper 729T6: 2008-2010 and 2012-2026
• Grasshopper 735BT6: 2008-2026
• Grasshopper 900D 1.3L: 2018-2026
• Grasshopper 928D2: 2007-2008
• Grasshopper 930D2: 2008-2019
• Grasshopper 932G2: 2007-2010 and 2012-2019
• Grasshopper 932G3: 2020-2026

Fitment note: Confirm your parts diagram or original clutch number matches one of the OEM or manufacturer cross-references listed below. If selecting by mower model alone, also verify the crankshaft bore, pulley configuration, rotation, connector, anti-rotation setup, and available installation clearance.

Installation Note: This clutch installs as a fully assembled, one-piece unit. Confirm your mower has sufficient frame clearance for the complete assembly. Applications requiring a two-piece installation for clearance should use the corresponding two-piece clutch configuration.

Replaces OEM Part Numbers

• Grasshopper: 388771, 388768, 604183
• Woods: 388771

Cross-Reference Aftermarket Numbers

• Warner: 5218-226, 5218226
• Warner: 5218-170, 5218170
• Warner: 5218-229, 5218229
• Warner: 5218-214, 5218214
• Xtreme: X0105
• Stens: 255-771
• Oregon: 33-189
• Rotary: 11074
• Sunbelt: B1XT0249

What’s Included

• Complete electric PTO clutch assembly
• Factory-balanced double pulley
• Pre-installed bearing assembly
• Encapsulated electromagnetic coil
• Integrated brake assembly
• Connector style as shown in product photos

Why Buy From PTO Direct USA?

• Fast USA shipping
• Fitment guarantee
  
• Fitment-first product support before and after sale
• Clear product images for easier clutch identification
• Trusted replacement supplier for homeowners, repair shops, and mower service professionals

FAQ

Why is the keyed spacer seated in the pulley-side bore?

The keyed mounting bushing may arrive seated in the pulley-side bore for shipping. This is not its installed position on reverse-mount applications. Before installation, gently push or lightly tap the spacer free through the center bore using a non-marring tool.

Position the spacer on the coil side only when required by the mower’s original hardware arrangement. The end of the crankshaft and the bushing must not touch. If the bushing bottoms against the crankshaft set it aside and use the provided flat washer instead. The washer should bear against the bearing’s inner race without contacting the bearing seal or outer race.

Can this clutch be installed in two pieces?

This replacement installs as a fully assembled, one-piece clutch. Confirm there is sufficient frame clearance to position the complete assembly during installation.

Does this PTO clutch fit the Grasshopper 623T?

Yes. Grasshopper 388771 is listed for Grasshopper 623T FrontMount mowers from 2013 through 2026, covering all currently listed 623T production years. Confirm the mower’s model information and original clutch number before ordering.

Is Warner 5218-226 the same fitment as Grasshopper 388771?

Warner 5218-226 is the Warner cross-reference associated with the Grasshopper 388771 clutch path.

Does this replace Warner 5218-170 or 5218-229?

Yes, Warner 5218-170 and Warner 5218-229 are commonly listed in the same replacement path as Grasshopper 388771 and Warner 5218-226.

Does this fit Grasshopper 722D2?

Yes, this clutch is listed for select 2008 Grasshopper 722D2 applications. Confirm your original clutch number and physical specs before ordering.

Is Grasshopper 388771 the same as 388740?

No. These are different clutch configurations. The 388771 path uses a 4-7/8-inch double-groove pulley, while the 388740 PTO clutch path uses a larger single-groove pulley. Match the original clutch number and pulley configuration before ordering.

What bore size does this clutch use?

This clutch uses a 1-1/8 inch bore, also written as 1.125". It will not fit a 1-inch crankshaft.

What pulley does this clutch use?

This clutch uses a 4-7/8 inch double pulley designed for a dual 1/2 inch belt setup. Do not substitute a single-pulley clutch.

What rotation does this clutch use?

This clutch uses clockwise rotation, commonly written as CW and frequently used on reverse mount applications.

What are common signs of a failing PTO clutch?

Common symptoms include mower blades not engaging, the PTO clutch clicking but the blades not spinning, slipping under load, intermittent blade engagement, a burning smell, or blades slowing down after the mower heats up. A worn coil can work cold, then weaken after 10 to 30 minutes of mowing.

Can PTO Direct USA help me confirm fitment?

Yes. Email support@ptodirectusa.com with your mower model number, serial number, deck size, original clutch number, and clear photos of the old clutch. For the best fitment help, include photos of the clutch label or stamped number, wiring connector, pulley, anti-rotation bracket, and crankshaft area.

Need help checking crankshaft size? Read the PTO clutch bore size guide.

Need help with rotation? Read the PTO clutch rotation guide.

If your old clutch will not come off the crankshaft, read the PTO clutch stuck on crankshaft guide before prying or hammering.

Need a different Grasshopper clutch? Browse the Grasshopper PTO clutch collection or the full electric PTO clutch catalog.