781039 PTO Clutch for Hustler Mini Z, Standard Z & Super Z | Warner 5218-110
781039 PTO Clutch for Hustler Mini Z, Standard Z & Super Z | Warner 5218-110
Overview
This aftermarket 781039 electric PTO clutch is a replacement for select Hustler Mini Z, Hustler Standard Z, Hustler Super Z, and related Big Dog mower applications using the 781039, 781039K, 787408, or Warner 5218-110 clutch path.
Warner identifies 5218-219 as the current replacement for the earlier 5218-110 clutch. This replacement uses a 1-1/8-inch crankshaft bore, approximately 6.31-inch pulley, CW rotation from the pulley side, reverse-mount configuration, and an integral 12 VDC electrical connection.
Key Features
- Aftermarket electric PTO clutch assembly
- Primary Hustler Part Number: 781039
- Hustler Clutch-Kit Path: 781039K
- Additional Hustler Reference: 787408
- Earlier Warner Number: 5218-110, 5218110
- Current Warner Replacement: 5218-219, 5218219
- OEM Warner Reference Torque: 200 ft-lbs
- Voltage: 12 VDC
- Crankshaft Bore: 1-1/8 inch / 1.125 inch
- Pulley Diameter: approximately 6.31 inch
- Rotation: CW from pulley side
- Mounting Style: reverse mount
- Connection Type: integral electrical connection
- Belt Groove: A/B combination replacement path
- Clutch Type: electric PTO clutch with integrated brake
- Complete assembled replacement clutch
Compatible Brands & Model Series
This is a part-number-first replacement for select Hustler, Big Dog, and Excel-built commercial mower applications using the 781039 clutch path.
Hustler Applications
- Hustler Mini Z: select applications using 781039, 781039K, 787408, or Warner 5218-110
- Hustler Standard Z: select applications using the same confirmed clutch path
- Hustler Super Z: select applications using the same confirmed clutch path
- Common Deck Paths: select 52-, 60-, and 72-inch commercial mower configurations
Big Dog and Excel Applications
- Big Dog Mowers: select Excel-built mower configurations using 781039 or 781039K
- Excel Industries Platforms: only when the original clutch or model-specific parts diagram identifies the 781039 path
Model-family warning: Mini Z, Standard Z, and Super Z names cover multiple engines, deck sizes, serial ranges, and PTO clutch configurations. Do not order from the mower-family name or deck size alone.
Replaces OEM Part Numbers
- Hustler: 781039, 781039K, 787408
- Big Dog: 781039, 781039K
- Excel Industries: 781039, 781039K
Kit-number note: The 781039K number represents the related clutch-kit path. Do not assume that every mounting bolt, washer, crankshaft key, spacer, harness, or anti-rotation component included in an OEM kit is included with an aftermarket clutch assembly.
Aftermarket Cross-Reference Numbers
- Earlier Warner Number: 5218-110, 5218110
- Current Warner Replacement: 5218-219, 5218219
- Xtreme: X0243
- Stens: 255-553
Warner replacement note: Warner identifies 5218-219 as the replacement for the earlier 5218-110 clutch.
Aftermarket Equivalence Note
781039 and 601311 remain separate OEM and Warner part-number paths. PTO Direct USA’s current aftermarket inventory has been confirmed to service both paths with the same physical replacement clutch assembly.
Orders placed through this 781039 listing receive the same confirmed aftermarket unit fulfilled through the PTO Direct USA 601311 inventory path.
This is a statement about the coverage of the aftermarket product currently carried by PTO Direct USA. It is not a claim that Hustler or Warner officially superseded 781039 to 601311.
Common Symptoms of a Failing PTO Clutch
- Blades will not engage when the PTO switch is activated
- The clutch clicks but the deck belt does not begin turning
- Blades engage when cold but stop after the mower heats up
- The clutch slips during heavy or wet cutting conditions
- The deck belt squeals, smokes, or overheats during engagement
- Burning smell near the engine crankshaft or PTO clutch
- Grinding, rumbling, or excessive pulley-bearing noise
- Intermittent blade engagement under load
- Visible heat damage around the coil housing or connector
- Excessive looseness or roughness at the pulley bearing
What’s Included
- 1 complete aftermarket electric PTO clutch assembly
- Integrated pulley
- Integrated electromagnetic coil and brake assembly
- Integral clutch-side electrical connection
- Bushing, Washer and Wire Lead as pictured
Why Buy From PTO Direct USA?
- Part-number-first PTO clutch listings
- Separate merchandising paths for commonly searched OEM numbers
- Clear aftermarket-equivalence and OEM-supersession distinctions
- Fitment-focused product descriptions
- Fast USA shipping
- 1-year warranty
- Support for mower owners, repair shops, and commercial operators
Need Help Confirming Fitment?
Send PTO Direct USA the complete Hustler or Big Dog mower model, serial number, deck size, engine model, and original PTO clutch number before ordering.
FAQ
What PTO clutch replaces Hustler 781039?
This aftermarket PTO clutch replaces Hustler 781039, the related 781039K clutch-kit path, and select 787408 applications.
What Warner number crosses to Hustler 781039?
The earlier Warner clutch path is 5218-110. Warner identifies 5218-219 as the current replacement for 5218-110.
Does this replace Hustler 781039K?
Yes. This clutch covers the 781039K replacement path. Supporting hardware included in an OEM clutch kit may not be included with the aftermarket clutch assembly.
Does this replace Hustler 787408?
Yes. Hustler 787408 is included in the supported 781039 aftermarket replacement path. Confirm the original part number and model-specific parts diagram before ordering.
Is this the same physical clutch sold on the PTO Direct USA 601311 page?
Yes. PTO Direct USA’s current aftermarket inventory has been confirmed to service both the 781039 and 601311 buyer paths with the same physical replacement clutch assembly.
Did Hustler officially replace 781039 with 601311?
This listing does not claim an official Hustler supersession from 781039 to 601311. They remain separate OEM and Warner search paths even though the current PTO Direct USA aftermarket unit has been confirmed to cover both applications.
What are the main clutch specifications?
This replacement uses a 1-1/8-inch crankshaft bore, approximately 6.31-inch pulley, CW rotation from the pulley side, reverse mounting, an integral 12 VDC electrical connection, and a 200 ft-lb OEM Warner reference torque class.
Does this fit a Hustler Mini Z?
It fits select Hustler Mini Z applications using 781039, 781039K, 787408, 5218-110, or 5218-219. Confirm the complete six-digit mower model and serial-specific parts diagram.
Does this fit a Hustler Standard Z?
It fits select Standard Z applications using the confirmed 781039 clutch path. Do not rely on the mower-family name or deck size alone.
Does this fit a Hustler Super Z?
It fits select Super Z applications using 781039, 781039K, 787408, or the Warner 5218-110 path. Other Super Z configurations use different PTO clutches.
Can I order this clutch by deck size?
No. Deck size helps narrow the application but does not identify the PTO clutch by itself. Match the original clutch number and official model-specific parts diagram first.
Is the mounting bolt included?
Do not assume the crankshaft bolt, washer, key, spacer, anti-rotation bracket, or mower-side wiring harness is included. Reuse or replace the mower-specific hardware as required.
Can I order using only Warner 5218?
No. Warner 5218 is a clutch family containing multiple configurations. Match the complete Warner number 5218-110 or 5218-219.