Toro 110-6766 PTO Clutch Cross-Reference Guide

Overview

If you're searching for Toro 110-6766, you're looking at a common electric PTO clutch replacement route used on select Toro TimeCutter, Toro Titan, and Exmark Quest zero-turn mower platforms.

This clutch family is also commonly searched under related OEM and aftermarket numbers including 103-9950, 100-6059, 108-9510, 108-9511, 107-1733, Warner 5219-81, Warner 5219-57, Stens 255-823, and Xtreme X0379.

Use this guide to confirm the 110-6766 replacement path, compare common cross-reference numbers, and avoid ordering a similar-looking PTO clutch with the wrong pulley, bore, connector, or deck belt setup.

110-6766 PTO Clutch Replacement Route

The 110-6766 PTO clutch is commonly used on select Toro and Exmark applications that require a 1-inch crankshaft bore, 5.8-inch / 5-13/16-inch pulley, CCW rotation, and an integral wire connector.

Shop this replacement: 110-6766 PTO Clutch Replacement for Toro and Exmark

Common Toro Applications

The 110-6766 clutch route is commonly associated with select Toro TimeCutter and Titan zero-turn mower models.

Toro TimeCutter Series

  • TimeCutter SS5000: 50-inch deck applications
  • TimeCutter SS5060: 50-inch deck applications
  • TimeCutter ZS5000: 50-inch deck applications
  • TimeCutter Z Series: Z5020, Z5030, Z5035, Z5040, and Z5060 50-inch deck applications
  • TimeCutter G4000: select early 50-inch deck applications using this clutch family

Toro Titan Series

  • Titan Z4800: 48-inch deck applications
  • Titan Z5200: 52-inch deck applications
  • Titan ZX5000: 50-inch deck applications
  • Titan ZX5020: 50-inch deck applications

Common Exmark Applications

The 110-6766 route is also commonly associated with select Exmark Quest models. Serial range matters on Exmark Quest applications, so do not order by model name alone.

  • Quest QST22BE482: 48-inch deck, serial 670000–919999
  • Quest QST24BE522: 52-inch deck, serial 670000–919999
  • Quest QT24KA501: 50-inch deck, serial 920000–999999
  • Quest E-Series QTE691KA501: 50-inch deck, serial 313000000–313999999
  • Quest 48-inch and 52-inch models: commonly listed for serial 790000 and up when using the 110-6766 clutch family

Related guide: Exmark Quest PTO Clutch Replacement Guide

Replaces OEM Part Numbers

  • Toro / Exmark: 110-6766, 103-9950, 100-6059, 108-9510, 108-9511, 107-1733

Aftermarket Cross-Reference Numbers

  • Warner Electric: 5219-81, 5219-57
  • Stens: 255-823
  • Xtreme: X0379

Common search variations: 1106766, Toro 1106766, Exmark 1106766, Warner 521981, Warner 521957, Stens 255823.

Key Specs to Confirm

  • Pulley Diameter: 5.8 inches / 5-13/16 inches
  • Crankshaft Bore: 1 inch
  • Rotation: CCW from pulley side
  • Voltage: 12V DC
  • Torque Rating: 125 ft-lbs
  • Belt Profile: 1/2-inch or 5/8-inch A/B belt profile
  • Connector Style: Integral wire connector

Important Fitment Check

Do not order a PTO clutch by appearance alone. Many Toro, Exmark, Ariens, Gravely, MTD, Wright, and John Deere PTO clutches look similar online but use different pulley diameters, connector styles, torque ratings, anti-rotation setups, or wiring layouts.

Before ordering, match the original PTO clutch number first. Then confirm:

  • Crankshaft bore size
  • Pulley diameter
  • Rotation direction
  • Connector style
  • Anti-rotation bracket or tab setup
  • Pulley offset
  • Deck belt path
  • Mower model and serial number

Common Confusion: 110-6766 vs 00191700

The 110-6766 clutch family is sometimes confused with Ariens / Gravely 00191700 or Warner 5219-45 because the assemblies can look similar in photos.

Do not mix these routes without confirming the physical specs. The Ariens / Gravely clutch family commonly uses a 6-inch pulley, while the Toro / Exmark 110-6766 route uses a 5.8-inch / 5-13/16-inch pulley.

Looking for the Ariens / Gravely version? See the 00191700 / Warner 5219-45 PTO Clutch Replacement.

Common Symptoms of a Failing 110-6766 PTO Clutch

  • Mower blades will not engage
  • PTO switch clicks but the deck belt does not turn
  • Blades engage only when the mower is cold
  • Weak blade engagement under load
  • Burning smell near the PTO clutch or belt area
  • Bearing noise from the clutch assembly
  • Intermittent operation after the mower warms up

Related PTO Clutch Pages

FAQ

What does Toro 110-6766 replace?

The 110-6766 PTO clutch route commonly replaces Toro / Exmark part numbers 103-9950, 100-6059, 108-9510, 108-9511, and 107-1733, along with related Warner, Stens, and Xtreme cross-reference numbers.

What Warner clutch number crosses to 110-6766?

Common Warner cross-reference numbers for this route include 5219-81 and 5219-57.

Does 110-6766 fit every Toro TimeCutter or Titan?

No. The 110-6766 clutch fits select Toro TimeCutter and Titan models, but not every Toro mower. Confirm the original clutch number, mower model, serial number, bore size, pulley diameter, connector style, and belt path before ordering.

Does 110-6766 fit Exmark Quest mowers?

It fits select Exmark Quest applications, but serial range matters. Confirm your Quest model, serial number, deck size, and original clutch number before purchasing.

Where can I buy the Toro 110-6766 PTO clutch replacement?

You can shop the replacement here: 110-6766 PTO Clutch Replacement for Toro and Exmark.

Need help confirming fitment? Contact PTO Direct USA with your mower model, serial number, deck size, and the number stamped on your original PTO clutch before ordering.