Exmark 142-3587 PTO Clutch Replacement | 135-5267 | Warner 5218-408
Overview
This page covers aftermarket electric PTO clutch options for select 48-inch and 52-inch Exmark Staris S-Series stand-on mowers using the Exmark 142-3587 / 135-5267 clutch path.
Exmark 135-5267 supersedes to the current Exmark 142-3587 service part number. This clutch path also cross-references Warner 5218-408, also written as 5218408.
The linked eBay options may include HD Switch BIGBearing HiTorque 210 ft-lb aftermarket replacements advertised under different Exmark or Warner part-number titles.
Key Features and Specifications
- Product Type: aftermarket electric PTO clutch with integrated brake
- Current Exmark Part Number: 142-3587
- Previous Exmark Part Number: 135-5267
- Warner Cross-Reference: 5218-408 / 5218408
- HD Switch Advertised Torque: 210 ft-lbs
- Original Warner Torque Rating: 175 ft-lbs
- Voltage: 12 VDC
- Crankshaft Bore: 1-1/8 inch
- Pulley / Flange Outside Diameter: approximately 7.34 inches
- Rotation: clockwise
- Mounting: reverse mount
- Connection Type: integral connector
- Aftermarket Pulley Design: machined billet pulley
- Aftermarket Bearing Design: larger replaceable pulley bearing with snap-ring retention
Replaces and Cross-References
- Exmark: 142-3587
- Exmark: 1423587
- Exmark: 135-5267
- Exmark: 1355267
- Warner: 5218-408
- Warner: 5218408
Confirmed Exmark Staris S Model Fitment
This clutch path is confirmed for the following 48-inch and 52-inch Exmark Staris S-Series stand-on mower models.
| Exmark Model | Description | Confirmed Serial Range | Diagram Clutch Number |
|---|---|---|---|
| STS650AKC48400 | 48-inch Staris S, Kohler | 404314159–406294344 | 135-5267 → 142-3587 |
| STS650AKC48400 | 48-inch Staris S, Kohler | 406294345–408644345 | 142-3587 |
| STS650AKC48400 | 48-inch Staris S, Kohler | 408644346–411294211 | 142-3587 |
| STS651GKA48400 | 48-inch Staris S, Kawasaki | 404314159–406294344 | 135-5267 → 142-3587 |
| STS651GKA48400 | 48-inch Staris S, Kawasaki | 406294345–408644345 | 142-3587 |
| STS651GKA48400 | 48-inch Staris S, Kawasaki | 408644346–411294211 | 142-3587 |
| STS730AKC52400 | 52-inch Staris S, Kohler | 404314159–406294344 | 135-5267 → 142-3587 |
| STS730AKC52400 | 52-inch Staris S, Kohler | 406294345–408644345 | 142-3587 |
| STS730AKC52400 | 52-inch Staris S, Kohler | 408644346–411294211 | 142-3587 |
| STS730GKA52400 | 52-inch Staris S, Kawasaki | 404314159–406294344 | 135-5267 → 142-3587 |
| STS730GKA52400 | 52-inch Staris S, Kawasaki | 406294345–408644345 | 142-3587 |
| STS730GKA52400 | 52-inch Staris S, Kawasaki | 408644346–411294211 | 142-3587 |
| STS730GKC52400 | 52-inch Staris S, Kohler configuration | 406294345–408644345 | 142-3587 |
Match the complete mower model number, serial range, and original clutch number before ordering. Do not order using only the Staris S name or deck size.
Important 60-Inch Staris S Exclusion
This is not the clutch path for the 60-inch Exmark Staris S.
Select 60-inch Staris S applications use the separate:
- Exmark 135-1307
- Exmark 142-3588
- Warner 5218-391
Do not substitute a 142-3587 / 135-5267 / 5218-408 clutch for a mower requiring 142-3588 / 135-1307 / 5218-391. The two paths are different even though both may be advertised for the Exmark Staris S family.
Important Fitment Check
Match the original PTO clutch number before ordering. This replacement path is intended for Exmark 142-3587 / 135-5267 and Warner 5218-408 / 5218408.
- Confirm the complete Exmark model number
- Confirm the mower serial number
- Confirm the mower has a 48-inch or 52-inch deck
- Match 142-3587, 135-5267, or 5218-408
- Confirm the linked listing still shows the expected 210 ft-lb aftermarket clutch
- Compare the 1-1/8-inch bore
- Compare the approximately 7.34-inch pulley or flange diameter
- Confirm clockwise rotation
- Confirm reverse mounting
- Compare the integral connector and wire position
- Compare the anti-rotation configuration
- Review the seller's current shipping, return, and warranty terms
- Do not install or test-mount the clutch until fitment is confirmed
Exmark Parts Lookup
The most secure method to verify the correct PTO clutch is to use the official Exmark Manuals and Parts Lookup and enter the complete mower model or serial number from the equipment identification tag.
Open the applicable engine assembly diagram and confirm that the clutch is listed as 142-3587 or the superseded number 135-5267.
Common Symptoms of a Failing PTO Clutch
- Blades will not engage when the PTO switch is activated
- PTO clutch clicks but the deck belt does not begin turning
- Blades engage when cold and stop after the mower heats up
- Blade speed drops while mowing heavy or wet grass
- Deck belt slips, squeals, or smokes during engagement
- Burning smell or excessive heat near the clutch
- Grinding, bearing noise, or visible pulley wobble
- Intermittent blade engagement under mowing load
Need Help Confirming Fitment?
Use the PTO Clutch Fitment Help page before ordering. It explains which part numbers, mower details, measurements, and photos are needed to confirm the correct clutch path.
FAQ
Does Exmark 135-5267 supersede to 142-3587?
Yes. The verified replacement path lists Exmark 135-5267 as superseded to Exmark 142-3587.
What Warner clutch cross-references this path?
The corresponding Warner clutch is 5218-408, also written as 5218408.
What are the original Warner 5218-408 specifications?
Warner specifies 12 VDC, 175 ft-lb torque, clockwise rotation, a 1-1/8-inch bore, approximately 7.34-inch pulley or flange diameter, reverse mounting, and an integral connector.
What is the advertised torque rating of the HD Switch replacement?
The current HD Switch BIGBearing HiTorque listing advertises a 210 ft-lb torque rating, compared with the original Warner rating of 175 ft-lbs.
Why are similar eBay listings priced differently?
The listings may target different Exmark and Warner part-number searches. A higher price does not automatically indicate a physically different or better clutch.
Is it reasonable to choose the lower-priced listing?
Yes, when the listing identifies the confirmed replacement path and shows matching specifications, photographs, mounting, connector, torque rating, and included components.
What Exmark models use this PTO clutch path?
Confirmed models include STS650AKC48400, STS651GKA48400, STS730AKC52400, STS730GKA52400, and STS730GKC52400 within the serial ranges listed above.
Does this clutch fit the STS730GKC52400?
Yes. Model STS730GKC52400 is confirmed with the 142-3587 clutch in the 2020 serial range 406294345 through 408644345.
Does this clutch fit a 60-inch Exmark Staris S?
No. Select 60-inch Staris S models use the separate 142-3588 / 135-1307 / Warner 5218-391 clutch path.
Is this a genuine Exmark or Warner clutch?
No. The linked HD Switch options are aftermarket replacement clutches unless an individual listing specifically states otherwise.
Who sells and ships the clutch?
The clutch is sold and fulfilled by the seller on eBay. Review the individual listing's shipping, warranty, and return terms before purchasing.