388740 PTO Clutch Replacement for Grasshopper 223, 325, 428D | Replaces Warner 5218-225, X0104

Overview

This Grasshopper 388740 PTO clutch replacement is an aftermarket electric blade-engagement clutch for select Grasshopper 200, 300, and 400 Series MidMount mowers and compatible Woods Mow'n Machine applications.

It is intended for applications using Grasshopper 388740, including those identified by Warner 5218-225 or its predecessor, Warner 5218-165.

The supplied clutch features a 1-1/8-inch crankshaft bore, single-groove pulley, clockwise rotation, and 12V DC operation. The pulley on current stock measures approximately 6-1/8 inches / 6.125 inches outside diameter, measured across the outer flange edges.

Match your original clutch number and mounting configuration before ordering. PTO Direct USA provides fitment support before and after purchase.

Key Features

• Aftermarket electric PTO clutch assembly for select Grasshopper and Woods mower applications
• Replacement Application: Grasshopper 388740
• Crankshaft Bore: 1-1/8 inches / 1.125 inches
• Measured Pulley Outside Diameter: approximately 6-1/8 inches / 6.125 inches
• Pulley Type: single-groove V-belt pulley
• Belt Application: 5/8-inch V-belt on supported applications; use the mower manufacturer's specified belt
• Rotation: clockwise (CW), viewed from the pulley side
• Mounting Configuration: Reverse mount
• Voltage: 12V DC
• Electrical Connection: connector configuration shown in the product photos
• Integrated clutch brake assembly
• Pre-installed bearing assembly

Compatible Brands & Models

The following models are associated with the 388740 replacement application. Fitment varies by production year, serial number, engine, and mower configuration. Confirm the original clutch number or the clutch specified in your mower's parts diagram.

Grasshopper Applications

• 218
• 220
• 223
• 225
• 227
• 321D
• 322D
• 325
• 325A
• 325D
• 327A
• 327EFI
• 329
• 428D
• 430D

Woods Applications

Select Woods Mow'n Machine applications specifying clutch number 388740.

Fitment note: Do not order by mower series name alone. Compare the original clutch number, bore and key arrangement, pulley configuration and offset, wiring connector, and anti-rotation setup.

OEM Part Number References

• Grasshopper: 388740
• Woods: 388740

Manufacturer & Aftermarket Cross-References

• Warner: 5218-225, 5218-165
• Warner: 5218225, 5218165
• Xtreme: X0104, X0248
• Stens: 255-865
• Rotary: 15565
• Sunbelt: B1XT0248

Before Ordering

• Confirm that the original clutch or mower parts diagram identifies the 388740 application
• Verify the 1-1/8-inch crankshaft bore and key arrangement
• Compare the single-groove pulley, belt profile, and pulley offset
• Match the clockwise rotation, reverse mount and electrical connector
• Check the anti-rotation bracket and mounting clearances

If the original clutch differs from the product photos or listed measurements, send us the details before ordering so we can help check the application.

What's Included

• Complete electric PTO clutch assembly
• Integrated single-groove pulley
• Pre-installed bearing assembly
• Electromagnetic coil
• Integrated brake assembly
• Electrical connector configuration shown in the product photos

Follow your mower's service instructions for the required mounting bolt, washers, spacers, and anti-rotation hardware.

Why Buy From PTO Direct USA?

• Fast USA shipping
• Fitment Guarantee
• Fitment support before and after purchase
• Clear product photos for easier clutch identification
• Replacement parts for homeowners, repair shops, and mower service professionals

FAQ

Does this PTO clutch replace Grasshopper 388740?

This aftermarket clutch is offered as a replacement for Grasshopper 388740 on supported mower applications. Match your original clutch number and compare the bore, key arrangement, pulley configuration, connector, and anti-rotation setup before ordering.

Are Warner 5218-225 and 5218-165 associated with this application?

Yes. Warner 5218-225 is associated with Grasshopper 388740 and replaces Warner 5218-165. This listing is for an aftermarket replacement, not a genuine Warner clutch.

What is the actual pulley diameter?

The pulley on current stock measures approximately 6-1/8 inches / 6.125 inches outside diameter. This measurement is taken across the outer flange edges, not at the bottom of the belt groove.

Why do some reference specifications list a 6.3-inch pulley?

Warner lists a 6.31-inch outside diameter for its 5218-225 clutch. The aftermarket unit offered here has a measured outside diameter of approximately 6.125 inches.

Outside diameter and the working diameter at which the belt runs are different measurements. Working diameter where the belt rides in the pulley is the critical spec . This aftermarket clutch is designed to replace the OEM and manufacture numbers in this listing.

Does it fit Grasshopper 223, 325, 329, 428D, or 430D?

These models appear in replacement catalogs for the 388740 application. Coverage is not universal across every year or configuration. Confirm the original clutch number or check the parts diagram for your mower's model and serial number.

What crankshaft bore does this clutch use?

This clutch has a 1-1/8-inch bore, also written as 1.125 inches. Match both the shaft diameter and key arrangement to your application.

What belt should I use?

Use the OEM-specified belt for your mower. Supported applications commonly use a 5/8-inch V-belt, but belt length, profile, routing, and tension must match the mower's drive system.

What rotation does this clutch use?

This clutch uses clockwise rotation, commonly written as CW, viewed from the pulley side.

Can I substitute another Grasshopper clutch number?

Do not substitute a different Grasshopper clutch number based only on appearance, bore size, or mower brand. Confirm the replacement specified for your mower and compare the complete clutch configuration.

What are common signs of a PTO clutch problem?

Symptoms can include blades not engaging, intermittent engagement, slipping under load, unusual bearing noise, or a burning smell. These symptoms can also result from wiring faults, low voltage, PTO switch problems, belt issues, or excessive deck load. Diagnose the cause before replacing the clutch.

Can PTO Direct USA help me confirm fitment?

Yes. Email support@ptodirectusa.com with your mower model number, serial number, deck size, and original clutch number. Include clear photos of the clutch label, pulley, bore, electrical connector, and anti-rotation area. We provide fitment support before and after purchase.

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 attempting removal.

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