Aeagle PTO Clutch GY20878 - Direct-Fit for John Deere L120–L190, 1 in Bore, CCW Rotation

Aeagle GY20878 PTO clutch is a direct-fit replacement for a wide range of John Deere and Scotts lawn tractor models, restoring power transfer to the deck drive.

If your mower deck no longer engages or the PTO feels unreliable, this Aeagle clutch offers a rugged, OEM-style replacement built to match published dimensions and rotation. It’s sized to fit tractors that use the GY20108, GY20652, GY20878, GY21340 or 5219-series part numbers and is engineered for the same crankshaft, pulley diameter, and belt widths those machines require. Before ordering, verify the part number on your machine to confirm compatibility.

Which tractors and part numbers is this clutch compatible with?

This clutch is compatible with numerous John Deere and Scotts models that list GY20108, GY20652, GY20878, GY21340, 5219-20 or 5219-73. Compatibility covers a range of L-series residential mowers plus some compact and commercial models.

• John Deere L120, L130, LA130, LA140, LA145, LA150, LA155, LA165, LA175
• Models L130, 145(PC9537), 155C(PC9538), 190C; G110(PC9342)
• D and E series: D140, D150, D155, D160, D170 and E140–E180 family
• Scott’s models L2048 and L2548; also fits some X-series units

What are the physical specs I need to check before buying?

The clutch is manufactured to match key dimensions and operating direction so it installs without modification on tractors that originally used the listed part numbers. Confirming a few measurements on your machine prevents returns and fitment problems.

• Crankshaft bore: 1"—verify your shaft size
• Pulley outer diameter: 6.10" to match belt wrap and clearance
• Torque rating: rated to 125 ft·lb (install per torque recommendations)
• Rotation: counterclockwise (CCW) as viewed from the pulley side
• Accepts belt widths: 1/2" or 5/8" depending on your deck drive

How will this clutch affect mower operation and maintenance?

Replacing a worn or seized PTO clutch restores dependable engagement of the mower deck and reduces slip under load. Because the unit matches original dimensions and rotation, it integrates with existing pulleys and belts without altering alignment when installed correctly.

• Improves deck engagement compared with degraded clutches
• Reduces belt slipping when properly torqued and aligned
• Allows reuse of original pulleys and brackets in most cases
• Regular inspection of mounting bolts and connections extends service life

What should I know about installation and verification?

Installation typically follows OEM steps: remove the old clutch, inspect the shaft and keyway, slide the replacement on, secure to specified torque, and verify belt alignment and rotation. Always follow safety procedures: disconnect spark plug, support the machine, and wear protective gloves and eye protection.

• Confirm part number on your original clutch before ordering
• Use the correct key and torque values—over-torquing can damage components
• Check belt condition and alignment when replacing the clutch
• Test engagement at low throttle before full operation

Who this product is for: The Aeagle GY20878 replacement clutch is aimed at homeowners, landscapers, and equipment technicians who maintain John Deere or compatible Scotts lawn tractors that list the noted part numbers. It’s for anyone needing a dependable replacement that mirrors OEM dimensions and rotation—ideal when the original clutch fails, binds, or begins to slip. If you’re unsure about fitment, compare the crankshaft bore, pulley OD, rotation direction, and part number on your current clutch to ensure a match before purchasing.