TCA21168 PTO Clutch Replacement for John Deere Z510A, Z520A, Z710A | Replaces TCA19812, TCA20655

Overview

This aftermarket TCA21168 electric PTO clutch replacement is built for select John Deere ZTrak mower applications using the TCA21168 / TCA20655 / TCA19812 / Warner 5218-157 clutch path.

This clutch fits select John Deere Z510A, Z520A, and late Z710A applications when the original clutch number and physical specifications match this listing.

Important Z710A serial-number note: This clutch fits John Deere Z710A models with serial number 020001 and higher. If your Z710A serial number is 020000 or below, do not order this listing without confirming the original clutch number on your mower.

This replacement is built for compatible John Deere ZTrak applications using a 1-1/8 inch crankshaft bore, 6.3 inch pulley-class PTO clutch, and CCW rotation from the pulley side.

Key Features

• Aftermarket electric PTO clutch replacement for select John Deere ZTrak applications
• Replaces John Deere: TCA21168, TCA20655, TCA19812
• Warner reference: 5218-157
• Crankshaft Bore: 1-1/8 inch / 1.125 inch
• Pulley Diameter: 6.3 inch class / approximately 6.29 to 6.375 inches
• Rotation: CCW from pulley side
• Voltage: 12V electric PTO clutch
• Belt Compatibility: commonly used with 1/2-inch or 5/8-inch A/B belt profiles on supported applications
• Standard 2-wire pigtail connector style, verify against product photos
• Fully assembled replacement clutch unit

Compatible Brands & Models

This PTO clutch fits select John Deere ZTrak mower applications using the TCA21168 / Warner 5218-157 clutch path. Fitment depends on mower model, serial number, original clutch number, deck configuration, and physical clutch specifications.

High-Confidence John Deere Applications

• John Deere Z510A
• John Deere Z520A
• John Deere Z710A: serial number 020001 and higher

Important Exclusions

• Do not use for John Deere Z720A: Z720A applications commonly use TCA19813 or TCA21167 depending on serial number.
• Do not use for John Deere Z810A, Z820A, Z910A, Z920A, or Z925A: these models commonly use different John Deere clutch paths.
• Do not merge with TCA19813 / TCA16998: that is a different Warner clutch path commonly associated with 5218-245.
• Do not merge with TCA21167: that is a different late-model commercial ZTrak clutch path commonly associated with Warner 5218-271.
• Do not merge with TCA16997 or Cub Cadet 917-05184: those listings may use a much larger pulley path and are not safe substitutes for TCA21168.

Replaces OEM Part Numbers

• John Deere: TCA21168, TCA20655, TCA19812

Supersession note: TCA21168 is commonly used as the replacement path for TCA20655 and TCA19812 on compatible John Deere ZTrak applications.

Cross-Reference Aftermarket Numbers

• Warner: 5218-157
• Xtreme: X0223
• Stens: 255-039X

What’s Included

• Complete electric PTO clutch assembly
• Integrated pulley
• Electromagnetic clutch coil
• Pre-installed bearing assembly
• 2-wire pigtail connector style, as shown in product photos

Before Installing

Before installing a new PTO clutch, inspect the mower deck drive system and clutch mounting area. A new clutch can fail early if the belt is misrouted, an idler is seized, a spindle is dragging, or the anti-rotation bracket is damaged.

• Confirm your mower model and serial number before ordering
• Match the original clutch number to TCA21168, TCA20655, TCA19812, or Warner 5218-157
• Inspect the anti-rotation bracket or frame stop before installation
• Check the deck belt for glazing, cracking, oil contamination, or stretch
• Confirm belt routing around the clutch pulley, idlers, and spindle pulleys
• Inspect idler pulleys and blade spindles for drag, wobble, or bearing noise
• Check the wiring connector for corrosion, melting, loose terminals, or damage
• Make sure the crankshaft is clean and free of rust, burrs, or keyway damage

Removal warning: If the old clutch will not slide off the crankshaft, do not hammer or pry aggressively against the clutch body. Use the PTO clutch stuck on crankshaft guide before removal.

Why Buy From PTO Direct USA?

• Fast USA shipping
• OEM-spec fitment guarantee
• 1-year warranty
• Fitment-first product support
• Clear product images for easier clutch identification
• Trusted replacement supplier for homeowners, repair shops, and mower service professionals

FAQ

What does TCA21168 replace?

This aftermarket replacement PTO clutch replaces John Deere TCA21168, TCA20655, and TCA19812. It also cross-references Warner 5218-157, Xtreme X0223, and Stens 255-039X.

Does TCA21168 fit John Deere Z710A?

Yes, this clutch fits John Deere Z710A mowers with serial number 020001 and higher. If your Z710A serial number is 020000 or below, confirm the original clutch number before ordering because earlier machines may use a different clutch path.

Does this clutch fit John Deere Z510A or Z520A?

This clutch fits select John Deere Z510A and Z520A ZTrak Estate applications using the TCA21168 / TCA19812 / Warner 5218-157 clutch path. Match the original clutch number and physical specifications before ordering.

Is TCA21168 the same as TCA21167?

No. TCA21168 and TCA21167 are different John Deere PTO clutch paths. Do not use this listing for TCA21167 applications.

Is TCA21168 the same as TCA19813?

No. TCA21168 and TCA19813 are different clutch paths. TCA19813 commonly cross-references Warner 5218-245 and fits different John Deere ZTrak applications.

What bore size does this PTO clutch use?

This clutch uses a 1-1/8 inch crankshaft bore. It will not fit a 1-inch crankshaft.

What pulley size does this PTO clutch use?

This clutch uses a 6.3 inch pulley-class design, commonly listed around 6.29 to 6.375 inches depending on measurement method.

What should I check before ordering?

Confirm the original clutch number, mower model, serial number, crankshaft bore, pulley diameter, connector style, belt routing, and anti-rotation setup before ordering.

Can PTO Direct USA help confirm fitment?

Yes. Email support@ptodirectusa.com with your mower model number, serial number, deck size, OEM clutch number, and clear photos of the old clutch. Include photos of the clutch label or stamped number, wiring connector, pulley, anti-rotation bracket, and deck belt routing.

Need a different John Deere clutch? Browse the John Deere PTO clutch collection or the full electric PTO clutch catalog.