Overview
If you're replacing the PTO clutch on a John Deere LA145, the most important part number to know is GY20878.
Over the years, John Deere has used several PTO clutch part numbers that ultimately route to the same replacement path. This creates confusion when owners find an older number stamped on the original clutch, listed in a parts diagram, or referenced in an older repair manual.
This guide explains the correct PTO clutch replacement for the John Deere LA145, outlines the superseded part numbers, and helps buyers identify the correct clutch before ordering.
What PTO Clutch Fits the John Deere LA145?
The current John Deere PTO clutch replacement path for the LA145 is:
- John Deere: GY20878
According to current John Deere parts documentation, GY20878 serves as the standardized PTO clutch assembly used throughout the LA145 production run. The research also indicates there is no separate PTO clutch serial-number split within the LA145 model itself.
Shop the GY20878 PTO Clutch Replacement
GY20878 Supersession History
Many LA145 owners discover a different PTO clutch number when inspecting the original clutch or reviewing older documentation.
Several earlier John Deere part numbers were superseded into the current GY20878 replacement path.
- GY20108
- GY20652
- GY21340
- GY20878 (current replacement)
If your original PTO clutch references one of these older numbers, GY20878 is typically the current replacement path.
Warner Cross References
Many original John Deere PTO clutches were manufactured by Warner Electric and may display a Warner number instead of a John Deere number.
The LA145 GY20878 clutch path is commonly associated with Warner 5219-series clutch numbers including:
- Warner 5219-20
- Warner 5219-72
- Warner 5219-73
- Warner 5219-114
If your original clutch carries one of these Warner numbers, start by matching that number and then verify the physical specifications before ordering.
Related John Deere Models
The GY20878 clutch path extends beyond the LA145 and appears across numerous John Deere lawn tractor families.
Commonly associated models include:
- John Deere LA130
- John Deere LA140
- John Deere LA145
- John Deere LA150
- John Deere LA155
- John Deere LA165
- John Deere LA175
- John Deere D140
- John Deere D150
- John Deere D155
- John Deere D160
- John Deere D170
- John Deere E140
- John Deere E150
- John Deere E160
- John Deere E170
- John Deere E180
Always confirm the original clutch number and specifications before ordering, especially when using model-based fitment information.
Key Specifications
- OEM Part Number: GY20878
- Crankshaft Bore: 1 inch
- Pulley Diameter: approximately 6.15 to 6.30 inches
- Rotation: CCW
- Operating Voltage: 12V DC
- Coil Resistance: approximately 2.0 to 4.0 ohms
- Torque Rating: around 105 lb-ft
Specifications should always be verified against the replacement clutch listing and original component before ordering.
Buy the Correct PTO Clutch Replacement
If your original PTO clutch is marked GY20878, GY21340, GY20652, GY20108, or one of the related Warner 5219-series numbers, start by matching that part number first. Then verify key specifications before ordering.
Shop the GY20878 PTO Clutch Replacement
Common PTO Clutch Failure Symptoms
- Mower blades will not engage
- PTO clutch clicks but blades do not spin
- Intermittent blade engagement
- Burning smell near the clutch
- Grinding or bearing noise
- Fuse blows when PTO is engaged
- Clutch works cold but fails when hot
Related PTO Clutch Guides
- Warner PTO Clutch Cross-Reference Directory
- Warner 5219 PTO Clutch Cross-Reference Guide
- John Deere PTO Clutches
- Shop All Electric PTO Clutches
FAQ
What PTO clutch fits a John Deere LA145?
The current John Deere PTO clutch replacement path for the LA145 is GY20878.
Does the LA145 have a PTO clutch serial number split?
Research indicates the LA145 uses the same GY20878 clutch path throughout production and does not have a separate PTO clutch serial-number break.
What part numbers were replaced by GY20878?
Common superseded numbers include GY20108, GY20652, and GY21340.
What Warner numbers are associated with GY20878?
Common Warner references include 5219-20, 5219-72, 5219-73, and 5219-114.
Where can I buy a GY20878 PTO clutch online?
Shop the GY20878 PTO Clutch Replacement.
Can PTO Direct USA help confirm fitment?
Yes. Provide your mower model number, serial number, and the part number stamped on the original clutch for fitment assistance.