110-6766 vs 116-1620 PTO Clutch Guide

Overview

If you're comparing 110-6766 and 116-1620, you're likely working on a Toro or Exmark mower and trying to confirm the correct PTO clutch replacement.

These two clutch paths are sometimes confused because both are used across Toro and Exmark mower families, but they are not the same clutch. The safest way to choose the correct replacement is to match the original clutch number first, then confirm the bore size, pulley diameter, connector style, torque rating, and physical setup.

Quick Difference

  • 110-6766: Common Toro / Exmark clutch path with a 1-inch bore and smaller pulley.
  • 116-1620: Commercial Toro / Exmark clutch path with a 1-1/8 inch bore, larger 7.39-inch pulley, and 200 lb-ft torque rating.

Do not substitute one for the other unless every specification and original clutch number path matches.

Buy the Correct PTO Clutch Replacement

If your original PTO clutch is marked 110-6766 or 116-1620, start by matching that OEM number first. Then verify key specifications before ordering.

Shop the 110-6766 PTO Clutch Replacement

Shop the 116-1620 PTO Clutch Replacement

110-6766 PTO Clutch Route

The 110-6766 PTO clutch is commonly associated with select Toro TimeCutter, Toro Titan, and Exmark Quest applications.

This clutch route is commonly searched with these numbers:

  • Toro / Exmark: 110-6766, 103-9950, 100-6059, 108-9510, 108-9511, 107-1733
  • Warner: 5219-81, 5219-57
  • Stens: 255-823
  • Xtreme: X0379

Related guide: Toro 110-6766 PTO Clutch Cross-Reference Guide

116-1620 PTO Clutch Route

The 116-1620 PTO clutch is commonly associated with select Exmark Lazer Z, Exmark Quest SP, and Toro Z Master G3 commercial mower applications.

This clutch route is commonly searched with these numbers:

  • Toro / Exmark: 116-1620, 116-1604, 109-9282
  • Warner: 5218-207, 5218-163
  • Stens: 255-207
  • Xtreme: X0239, X0239-K
  • Rotary: 15276

Related guide: Toro 116-1620 PTO Clutch Cross-Reference Guide

Key Fitment Differences

  • OEM Path: 110-6766 and 116-1620 are separate Toro / Exmark replacement paths.
  • Bore Size: 110-6766 uses a 1-inch bore; 116-1620 uses a 1-1/8 inch bore.
  • Pulley Size: 110-6766 uses a smaller pulley; 116-1620 uses a larger 7.39-inch pulley.
  • Torque Rating: 116-1620 is a heavier commercial-duty 200 lb-ft clutch path.
  • Applications: 110-6766 is more commonly tied to Toro TimeCutter, Titan, and Exmark Quest paths; 116-1620 is more commonly tied to Toro Z Master G3 and Exmark Lazer Z commercial paths.

Important Fitment Check

Do not order by appearance alone. These PTO clutches may look similar in online photos, but the bore size, pulley diameter, torque rating, connector style, and anti-rotation setup can be different.

Before ordering, verify:

  • Original PTO clutch number
  • Crankshaft bore size
  • Pulley diameter
  • Rotation direction
  • Connector style
  • Anti-rotation bracket or tab setup
  • Pulley offset
  • Deck belt routing

Common Symptoms of a Failing PTO Clutch

  • Mower blades will not engage
  • PTO clutch clicks but blades do not spin
  • Deck belt slips under load
  • Burning smell near the clutch or belt area
  • Bearing noise during engagement or shutdown
  • Weak engagement after the mower warms up
  • Intermittent operation during mowing

Related PTO Clutch Pages

FAQ

Is 110-6766 the same as 116-1620?

No. 110-6766 and 116-1620 are separate Toro / Exmark PTO clutch paths. They use different bore sizes and different physical specifications.

Where can I buy a 110-6766 PTO clutch?

If your original clutch is marked 110-6766, start here: Shop the 110-6766 PTO Clutch Replacement.

Where can I buy a 116-1620 PTO clutch?

If your original clutch is marked 116-1620, start here: Shop the 116-1620 PTO Clutch Replacement.

Can I use 116-1620 instead of 110-6766?

No. Do not substitute 116-1620 for 110-6766 unless the original clutch number and all physical specifications match. The bore size, pulley diameter, and clutch path are different.

Which clutch fits Exmark Quest?

Some Exmark Quest applications use the 110-6766 clutch path, while select Quest SP applications may use the 116-1620 path. Match the original clutch number before ordering.

Which clutch fits Exmark Lazer Z?

Select Exmark Lazer Z commercial applications use the 116-1620 clutch path. Always verify the original clutch number, serial range, and physical specifications.

What is the safest way to choose between 110-6766 and 116-1620?

Match the number stamped on your original PTO clutch first. Then confirm bore size, pulley diameter, connector style, rotation, anti-rotation setup, and deck belt routing.

Need help confirming fitment? Contact PTO Direct USA with the number stamped on your original PTO clutch before ordering.