AM100979 PTO Clutch Replacement for John Deere STX38 Yellow Deck | Replaces AM122969, 5215-35
AM100979 PTO Clutch Replacement for John Deere STX38 Yellow Deck | Replaces AM122969, 5215-35
Overview
This John Deere AM100979 PTO clutch replacement is an aftermarket electric clutch for select STX38 yellow deck, STX30, and other John Deere lawn tractors using the replacement numbers listed below.
Replaces AM100979, AM115090, AM118969, and AM122969, with cross-references to Warner 5215-35 and Xtreme X0407.
The clutch supplied here features a 1-inch crankshaft bore, 5.50-inch pulley, CCW rotation, and 105 ft-lb torque rating. Match your original clutch number, key arrangement, pulley alignment, and electrical connector before ordering.
STX deck check: This listing covers select yellow deck applications. For STX38 or STX46 black deck models, use our John Deere STX clutch guide to identify the correct replacement.
Key Features
- Crankshaft Bore: 1 inch
- Pulley Diameter: 5.50 inches / 5-1/2 inches
- Rotation: CCW — counter-clockwise from the pulley side
- Voltage: 12V DC
- Torque Rating: 105 ft-lbs
- Belt Compatibility: 1/2-inch or 5/8-inch belts on supported applications
- Electrical Connection: connector as shown in the product photos
- Encapsulated electromagnetic coil
- Fully assembled replacement clutch
Compatible John Deere Models
Model references include the following tractors when equipped with one of the listed original clutch numbers:
- STX38: select yellow deck applications
- STX30: select applications using the AM100979 clutch family
- 108, 111, 112-L, 116, 130, 160, 165, and 175: confirm the original clutch number and mounting configuration
John Deere 111 keyway check: If your old clutch is marked MA-GT-JD2 and has a groove inside the bore for an external crankshaft key, choose our MA-GT-JD2 PTO clutch replacement.
Fitment can vary by serial number, engine, and deck configuration. Confirm the original clutch number or consult the OEM parts diagram for your complete model and serial number.
Replaces OEM Part Numbers
- John Deere: AM100979, AM115090, AM118969, AM122969
Manufacturer & Aftermarket Cross References
- Warner Electric: 5215-35, 521535
- Xtreme: X0407
What’s Included
- Complete electric PTO clutch assembly
- 5.50-inch pulley
- Pre-installed bearing assembly
- Encapsulated electromagnetic coil
- Electrical connection as pictured
How to Confirm Fitment
- Match the original clutch number. Check the label or stamping for a listed John Deere or Warner reference.
- Check the mounting details. Compare the bore, key arrangement, pulley alignment, and anti-rotation bracket.
- Compare the electrical connection. Match your mower’s connector to the product photos.
- Confirm the STX deck version. Use the model and serial number alongside deck color when checking STX applications.
For installation help, read our PTO clutch installation guide.
Why Buy From PTO Direct USA?
- Fitment support before and after purchase: help matching your original clutch number and mower configuration
- Text and photo support: send your mower tag and clutch photos to 541-361-8778, or visit our Parts Desk
- Fast USA shipping: get the replacement parts you need to get back to mowing
- Fitment Guarantee: review our coverage and fitment requirements before ordering
- Detailed product photos: compare the clutch, connector, and mounting features before you buy
- Practical installation resources: guides for clutch identification, installation, and troubleshooting
Frequently Asked Questions
Does this clutch fit every John Deere STX38?
No. This replacement is listed for select STX38 yellow deck applications. Black deck versions use different clutch configurations. Match the original part number and use our STX clutch comparison guide if you need help identifying yours.
Does this replace Warner 5215-35?
Warner 5215-35 is a listed cross-reference for this AM100979 replacement. Compare the original clutch number, key arrangement, mounting position, and connector before ordering.
What are the bore size, pulley size, and rotation?
The replacement sold here has a 1-inch bore, 5.50-inch pulley, and counter-clockwise rotation from the pulley side.
Is deck color enough to confirm fitment?
Deck color is a useful clue on STX tractors, but decks and engines may have been replaced over the years. The original clutch number and the OEM parts diagram for your model and serial number provide a stronger match.
Can you help identify my old clutch?
Yes. Text 541-361-8778 or email support@ptodirectusa.com with your mower model, serial number, original clutch number, and clear photos of the clutch and connector. Include a close-up of the bore and key arrangement when comparing older John Deere 111 clutches.
Related Fitment & Installation Guides
- John Deere STX38 PTO clutch replacement
- How to check PTO clutch bore size
- How to identify PTO clutch rotation
- Help removing a clutch stuck on the crankshaft
Need a different replacement? Browse the John Deere PTO clutch collection or the full electric PTO clutch catalog.