The 110-6766 PTO clutch is a Toro and Exmark electric PTO clutch replacement used on select Toro TimeCutter, Toro Titan, and Exmark Quest zero-turn mower platforms. It is commonly found on 48-inch, 50-inch, and 52-inch deck applications where proper blade engagement depends on the correct clutch, pulley diameter, crankshaft bore, wiring connector, and deck setup.
If your mower blades will not engage, the clutch clicks but the deck belt does not move, or the blades slow down under load, the PTO clutch may be worn, weak, slipping, or failing electrically. This guide helps you confirm whether your mower belongs in the Toro / Exmark 110-6766 PTO clutch replacement family before ordering.
Already confirmed your part number? View the Toro Exmark 110-6766 PTO clutch replacement or browse the Toro PTO clutch collection and Exmark PTO clutch collection.
Need help confirming fitment? Email support@ptodirectusa.com with your mower model number, serial number, OEM clutch number, and clear photos of the old clutch, wiring connector, pulley, and deck belt routing.
110-6766 PTO Clutch Replacement Specs
The Toro / Exmark 110-6766 clutch family is commonly associated with a 1-inch crankshaft bore, 5.8-inch / 5-13/16-inch pulley, CCW rotation, and an integral connector. Always compare the replacement clutch to your original unit before ordering.
- Primary replacement number: 110-6766
- Crankshaft bore: 1 inch
- Pulley diameter: 5.8" / 5-13/16"
- Rotation: CCW from pulley side
- Torque rating: 125 ft-lbs
- Connector style: integral connector
- Common use: select Toro TimeCutter, Toro Titan, and Exmark Quest zero-turn mower applications
Fitment warning: A PTO clutch can look similar and still be wrong. Confirm the OEM number, bore size, pulley diameter, pulley offset, rotation, wiring connector, and anti-rotation bracket before installation.
Replaces OEM Part Numbers
The 110-6766 PTO clutch replaces Toro and Exmark OEM numbers in the same confirmed clutch family.
Toro / Exmark
Manufacturer & Aftermarket Cross-Reference Numbers
- Warner 5219-81
- Warner 5219-57
- Stens 255-823
- Xtreme X0379
Use these cross-reference numbers as a starting point, then verify the original clutch specs before ordering the 110-6766 PTO clutch replacement.
Compatible Toro Models Using 110-6766
The 110-6766 clutch family is heavily associated with Toro TimeCutter and Titan zero-turn mower platforms. Fitment can vary by model year, deck size, engine package, and previous service history, so always confirm the OEM clutch number when possible.
Toro TimeCutter SS Series
Toro TimeCutter Z Series
- TimeCutter Z5000
- TimeCutter Z5020
- TimeCutter Z5030
- TimeCutter Z5035
- TimeCutter Z5040
- TimeCutter Z5060
Toro TimeCutter ZS Series
Toro Titan Series
For broader Toro routing, see the Toro PTO clutch replacement guide.
Compatible Exmark Models Using 110-6766
Exmark Quest Series
The 110-6766 clutch family is tied to selected Exmark Quest models with 48-inch, 50-inch, and 52-inch decks. Serial range matters on Exmark applications, so confirm the model and serial number before ordering.
- QST22BE482: 48" deck, serial 670000–919999
- QST24BE522: 52" deck, serial 670000–919999
- QT24KA501: 50" deck, serial 920000–999999
- QTE691KA501: 50" Quest E-Series, serial 313000000–313999999
- Quest 48" and 52" models: commonly listed for serial 790000 and up when using the 110-6766 clutch family
Important: Do not assume all Exmark Quest models use this clutch. Some 42-inch Quest models use a different PTO clutch. Confirm the OEM number before ordering.
For serial-specific guidance, see the Exmark Quest PTO clutch replacement guide.
For broader Exmark fitment support, see the Exmark PTO clutch replacement guide.
Related But Separate PTO Clutch Families
Some aftermarket catalogs group similar-looking PTO clutches together even when pulley diameter, torque rating, connector style, or wiring layout differs. These related families should be verified separately before ordering.
- Ariens / Gravely 00191700 and Warner 5219-45: use the dedicated Ariens Gravely 00191700 / Warner 5219-45 PTO clutch replacement.
- MTD / Cub Cadet 717-04214, 917-04214, 717-04526, 917-04526: should be handled on a dedicated Cub Cadet / MTD listing.
- John Deere AM138234, Wright 71410006, and Great Dane GDA10017: should be handled on dedicated listings because those applications can use different pulley diameters, torque ratings, or wiring layouts.
Do Not Confuse 110-6766 With Other PTO Clutch Families
The 110-6766 clutch family is not interchangeable with every Toro, Exmark, Cub Cadet, Ariens, or Gravely PTO clutch that looks similar in photos. Pulley diameter, torque rating, pulley offset, connector style, and rotation matter.
110-6766 vs. Ariens / Gravely 00191700
The Ariens / Gravely 00191700 family commonly cross-references to Warner 5219-45 and uses a 6.00-inch pulley. The Toro / Exmark 110-6766 family commonly cross-references to Warner 5219-81 and uses a 5.8-inch / 5-13/16-inch pulley. Do not merge these families unless the original clutch number and physical specs confirm the match.
110-6766 vs. Cub Cadet / MTD 717-04214
The Cub Cadet / MTD 717-04214 and 917-04214 clutch families may appear in broad aftermarket cross-reference lists, but they should be verified separately. Torque rating, connector style, and wiring layout can differ from the Toro / Exmark 110-6766 family.
110-6766 vs. 01008434 / 759-05064
The 01008434 / 759-05064 family is commonly used on older Cub Cadet, MTD-built, Toro, Wheel Horse, and related platforms. That family usually uses an approximately 5.35-inch pulley, not the 5.8-inch / 5-13/16-inch pulley associated with Toro / Exmark 110-6766.
If your original clutch is marked 01008434, 759-05064, 124833, or 539124833, start with the 01008434 PTO clutch replacement guide instead.
Common Symptoms of a Failing 110-6766 PTO Clutch
A failing PTO clutch can cause blade engagement problems, belt movement issues, heat, noise, or intermittent operation. These symptoms can also be caused by wiring, voltage, belt routing, idler pulleys, or deck spindles, so inspect the system before replacing parts.
- Mower blades will not engage when the PTO switch is activated
- PTO clutch clicks but blades do not spin
- Deck belt does not move when the clutch engages
- Intermittent blade engagement
- Blades slow down or stop under load
- Burning smell from the clutch or belt area
- Squealing, grinding, or bearing noise near the clutch
- PTO clutch gets hot during mowing
- PTO fuse or wiring issues caused by clutch coil failure
- Blades continue spinning longer than normal after disengagement
If your blades will not engage at all, start with the PTO clutch won’t engage troubleshooting guide. If the clutch clicks but the blades do not spin, use the PTO clutch clicks but blades won’t spin guide. If the clutch slips under load, see the PTO clutch slipping under load guide. If the clutch gets hot or smells burnt, read the PTO clutch getting hot or smells burnt guide.
How to Confirm Fitment Before Ordering
The most reliable way to confirm compatibility is to match the OEM number stamped, engraved, printed, or labeled on your original PTO clutch. If the number is missing, compare the clutch specs and mower details carefully.
- Match the OEM clutch number whenever possible
- Confirm the crankshaft bore is 1 inch
- Confirm the pulley diameter is 5.8" / 5-13/16"
- Confirm CCW rotation from pulley side
- Compare the wiring connector or lead style
- Check the anti-rotation bracket position
- Confirm the mower model, serial number, engine setup, and deck size
- Inspect belt routing and pulley alignment before installation
Not sure where to find the clutch number? Use the PTO clutch fitment guide before ordering.
Before Installing a New PTO Clutch
A replacement PTO clutch can fail early if the mower has belt, pulley, wiring, or deck resistance problems. Before installing the 110-6766 replacement, inspect the mower carefully.
- Check the deck belt for glazing, cracks, oil, or wear
- Confirm belt routing around the clutch pulley, idlers, and spindle pulleys
- Make sure blade spindles and idler pulleys spin freely
- Inspect the wiring connector for corrosion, loose terminals, or heat damage
- Check battery voltage and charging system condition
- Inspect the crankshaft for rust, burrs, or keyway damage
- Confirm the anti-rotation bracket is installed correctly
Review the PTO clutch installation guide before installing the replacement. If the old clutch will not slide off the crankshaft, see the PTO clutch stuck on crankshaft guide before forcing removal.
Shop 110-6766 PTO Clutch Replacement
If your original clutch matches the Toro / Exmark 110-6766 replacement family and the core specs line up, shop the 110-6766 PTO clutch replacement.
You can also browse the Toro PTO clutch collection, Exmark PTO clutch collection, or the full electric PTO clutch catalog.
Related OEM Cross-Reference Guides
- 103-9950 PTO Clutch Replacement for Toro and Exmark
- 100-6059 PTO Clutch Replacement for Toro and Exmark
- 108-9510 PTO Clutch Replacement for Toro and Exmark
- Warner 5219-81 PTO Clutch Replacement
Related Model Fitment Guides
- Toro TimeCutter SS5000 PTO Clutch Replacement
- Toro TimeCutter SS5060 PTO Clutch Replacement
- Toro Titan Z4800 PTO Clutch Replacement
- Toro Titan Z5200 PTO Clutch Replacement
- Exmark Quest PTO Clutch Replacement
Helpful PTO Clutch Resources
- PTO Clutch Fitment Guide
- PTO Clutch Installation Guide
- PTO Clutch Won’t Engage Troubleshooting Guide
- Shop All Electric PTO Clutches
FAQ
What does the 110-6766 PTO clutch replace?
The 110-6766 PTO clutch commonly replaces Toro and Exmark numbers including 103-9950, 100-6059, 108-9510, 108-9511, and 107-1733. It also cross-references Warner 5219-81 and related Toro / Exmark aftermarket replacements.
What size pulley does the 110-6766 clutch use?
The Toro / Exmark 110-6766 clutch family is commonly associated with a 5.8-inch / 5-13/16-inch pulley. Confirm the pulley size on your original clutch before ordering.
What crankshaft bore does this clutch use?
This PTO clutch family commonly uses a 1-inch crankshaft bore. Always confirm the bore size on your original clutch before installing a replacement.
What rotation does the 110-6766 PTO clutch use?
The 110-6766 PTO clutch family commonly uses CCW rotation from the pulley side. Rotation should be confirmed before installation.
Does 110-6766 fit Toro TimeCutter mowers?
Yes, many Toro TimeCutter SS, Z, and ZS 50-inch deck models are associated with the 110-6766 clutch family, including SS5000, SS5060, Z5000, Z5020, Z5030, Z5035, Z5040, Z5060, and ZS5000. Confirm by original clutch number and mower details.
Does 110-6766 fit Toro Titan mowers?
Many Toro Titan models, including Z4800, Z5200, ZX5000, and ZX5020 references, are commonly associated with this clutch family. Confirm the OEM number and specs before ordering.
Does 110-6766 fit Exmark Quest mowers?
Selected Exmark Quest 48-inch, 50-inch, and 52-inch models use the 110-6766 cross-reference family. Serial number is important on Exmark applications, so verify the exact model, serial range, and original clutch number.
Is 110-6766 the same as Ariens / Gravely 00191700?
No. The Ariens / Gravely 00191700 clutch family commonly cross-references to Warner 5219-45 and uses a 6.00-inch pulley. The Toro / Exmark 110-6766 family commonly cross-references to Warner 5219-81 and uses a 5.8-inch / 5-13/16-inch pulley.
Is 110-6766 the same as 01008434?
No. The 01008434 / 759-05064 family is a different PTO clutch group and commonly uses an approximately 5.35-inch pulley. Do not substitute it for 110-6766 unless the original clutch number and physical specs confirm the match.
What if my old PTO clutch will not come off?
If the old clutch is stuck on the crankshaft, stop before forcing it. Rust, burrs, seized hardware, or a tight keyway can bind the clutch in place. See the PTO clutch stuck on crankshaft guide before prying, hammering, or pulling from one side.
Can PTO Direct USA help me confirm fitment?
Yes. Email support@ptodirectusa.com with your mower model number, serial number, OEM 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, clutch pulley, deck belt routing, and any visible Warner or Ogura numbers on the clutch body.