781039 / 781039K PTO Clutch Replacement for Hustler Standard Z | Warner 5218-110
781039 / 781039K PTO Clutch Replacement for Hustler Standard Z | Warner 5218-110
Overview
This 781039 PTO clutch replacement is an aftermarket electric clutch for select Hustler Standard Z commercial zero-turn mowers, along with supported Mini Z, Super Z, and Big Dog applications. Related replacement references include 781039K, 787408, and Warner 5218-110.
The assembly features a 1-1/8-inch crankshaft bore, single-groove pulley measuring approximately 6-1/8 inches outside diameter, clockwise rotation viewed from the pulley side, and a reverse-mount configuration.
Key Features
- Aftermarket electric PTO clutch replacement for supported Hustler and Big Dog applications
- Primary OEM Reference: Hustler 781039
- Related OEM References: 781039K, 787408
- Earlier Warner Reference: 5218-110
- Current Warner Replacement: 5218-219
- 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 Width: 5/8-inch belt on supported applications; use the OEM-specified belt for your mower
- Rotation: clockwise (CW), viewed from the pulley side
- Mounting Style: reverse mount
- Voltage: 12V DC
- Connector: flat side-by-side at clutch or optional wire harness to extend to T-plug
- Integrated electromagnetic clutch and brake assembly
Compatible Hustler & Big Dog Applications
This replacement is intended for select mower configurations specifying the OEM or manufacturer clutch numbers listed below.
- Hustler Standard Z: select 52-inch, 60-inch, and 72-inch applications
- Hustler Super Z: select 52-inch, 60-inch, and 72-inch applications using the listed clutch configuration
- Hustler Mini Z: select applications using the listed clutch configuration
- Big Dog: select applications referencing 781039 or 781039K
Fitment varies by mower model, serial number, engine package, and deck configuration. Confirm the original clutch number or consult the parts diagram for your exact mower before ordering.
OEM Part Number References
- Hustler / Excel: 781039, 781039K, 787408
- Big Dog: 781039, 781039K
Manufacturer Cross-Reference
- Earlier Warner Electric: 5218-110
- Earlier Warner Electric: 5218110
- Current Warner Electric Replacement: 5218-219
- Current Warner Electric Replacement: 5218219
Warner identifies 5218-219 as the replacement for 5218-110.
Aftermarket Cross-Reference Numbers
- Xtreme: X0243
- Stens: 255-553
Before You Order
Compare your original clutch with the product photos and confirm:
- The original clutch number matches a supported reference listed above
- The crankshaft requires a 1-1/8-inch bore
- The bore, drive bushing, and key arrangement match the required installation
- The mower uses a single-groove, reverse-mount clutch
- Rotation is CW when viewed from the pulley side
- The belt groove, pulley offset, and mounting height suit your mower
- The electrical connector and anti-rotation connection match the installation
- The correct mounting hardware and spacer arrangement are available
Need help comparing your clutch? Send us the mower model, serial number, original clutch number, and clear photos before ordering.
What’s Included
- Complete aftermarket electric PTO clutch assembly
- Integrated single-groove pulley
- Pre-installed bearing assembly
- Electromagnetic coil and brake assembly
- Flat side-by-side clutch connector
- Optional wire harness extension
Why Buy From PTO Direct USA?
- Fast USA shipping
- Fitment Guarantee
- Fitment support before and after purchase
- Clear product photos for easier clutch identification
- Support for homeowners, commercial operators, and mower repair professionals
FAQ
Does this PTO clutch replace Hustler 781039?
Yes. This aftermarket clutch is offered as a replacement for Hustler 781039 on supported applications. Match your original clutch number and physical configuration before ordering.
Does this cover 781039K and 787408 applications?
Both numbers are included in the replacement references for this listing. For a 781039K kit application, compare the required accessories with the What’s Included section and product photos.
What Warner number corresponds to this clutch?
The earlier manufacturer reference is Warner 5218-110. Warner identifies 5218-219 as its replacement. Both dashed and compact number formats are listed above for identification.
Does this fit every Hustler Standard Z, Mini Z, or Super Z?
No. These mower families use multiple clutch configurations. Confirm the original clutch number and the parts diagram for your complete mower model and serial number.
Why do some reference specifications list a 6.3-inch pulley?
Warner lists a 6.31-inch outside diameter for its 5218-219 clutch, the replacement for 5218-110. The aftermarket unit offered here has a measured outside diameter of approximately 6.125 inches.
Outside diameter and the working diameter where the belt rides are different measurements. For belt speed, the critical measurement is that working diameter—not the outer flange edge. This aftermarket clutch is designed to replace the OEM and manufacturer part numbers listed here.
Is this a reverse-mount clutch?
Yes. This replacement uses a reverse-mount configuration. Follow the mounting orientation, drive-bushing arrangement, and spacer placement specified for your mower. Product-photo orientation is not an installation diagram.
What connector does this clutch use?
The clutch has a flat side-by-side connector, with an optional wire harness extension to a T-plug. Compare your mower’s wiring connection before selecting the harness option.
What belt should I use?
Use the OEM-specified belt for your exact mower and deck configuration. Belt width, length, and profile must suit the complete drive system.
Can PTO Direct USA help confirm fitment?
Yes. We provide fitment support before and after purchase. Email support@ptodirectusa.com with your mower model, serial number, engine information, and original clutch number. Photos of the clutch label, bore, drive bushing, pulley, connector, and anti-rotation connection help us compare the installation.