Exmark 142-3587 PTO Clutch Replacement | 135-5267 | Warner 5218-408
Overview
This page covers aftermarket electric PTO clutch options for select 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 part number. The current aftermarket replacement path also references Warner 5218-408 / 5218408.
The eBay collection linked from this page currently includes HD Switch BIGBearing HiTorque 210 ft-lb aftermarket replacements marketed under different part-number titles.
Important price note: One option may be priced significantly higher even though the listings appear to cover the same HD Switch clutch and confirmed replacement-number path. Based on the verified 135-5267 to 142-3587 supersession, the lower-priced listing should be the better-value option when it still identifies Exmark 135-5267, Exmark 142-3587, or Warner 5218-408 and shows the same clutch specifications.
Always review the current listing price, part numbers, specifications, shipping terms, return policy, and included items before purchasing. Products are sold and fulfilled by independent sellers on eBay.
Supersession evidence: PartsTree’s model-specific Exmark parts diagram lists 135-5267 as superseded to 142-3587. View the part-number reference.
Key Features
- 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 HiTorque Rating: 210 ft-lbs
- OEM Reference Rating: 175 ft-lbs
- Voltage: 12 VDC
- Crankshaft Bore: 1-1/8 inch
- Pulley / Flange OD: approximately 7.34 inches
- Rotation: CW
- Mounting: reverse mount
- Connection Type: integral connector
- Pulley Design: machined billet pulley
- Bearing Design: larger replaceable pulley bearing with snap-ring retention
Compatible Brands & Model Series
This replacement path fits select 48-inch and 52-inch Exmark Staris S-Series stand-on mowers originally equipped with the 135-5267 clutch or currently routed to 142-3587.
Confirmed model paths include:
- STS650AKC48400: 48-inch Staris S-Series with Kohler engine
- STS651GKA48400: 48-inch Staris S-Series with Kawasaki engine
- STS730AKC52400: 52-inch Staris S-Series with Kohler engine
- STS730GKA52400: 52-inch Staris S-Series with Kawasaki engine
Match the complete mower model number, serial number, and original clutch number before ordering.
Replaces OEM Part Numbers
- Exmark: 142-3587
- Exmark: 135-5267
Supersession path: Exmark 135-5267 supersedes to Exmark 142-3587.
Aftermarket Cross-Reference Numbers
- Warner: 5218-408
- Warner: 5218408
Understanding the eBay Options
The linked collection may contain more than one listing for this clutch because sellers target different buyer search terms:
- One listing may emphasize the current Exmark 142-3587 number
- Another may emphasize the earlier Exmark 135-5267 number
- Another may emphasize the Warner 5218-408 cross-reference
Those different listing titles do not automatically mean the clutches are physically different.
When two listings show the same brand, photographs, 210 ft-lb rating, bore, pulley, connector, mounting arrangement, and replacement-number path, the lower-priced listing should generally provide the better value.
Do not pay more solely because one title uses the newer 142-3587 part number. Confirm the full listing details before ordering because eBay sellers can revise listings, specifications, pricing, and included items.
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.
Do not substitute the separate Exmark 142-3588 / 135-1307 clutch based on the Staris S name alone. That is a different clutch path used on 60-inch Staris S applications.
Before Ordering
- Match Exmark 142-3587, Exmark 135-5267, or Warner 5218-408
- Confirm the complete Exmark mower model number
- Confirm the mower serial number
- Confirm the mower has a 48-inch or 52-inch deck
- Confirm the linked listing still shows the expected 210 ft-lb clutch
- Compare the bore, pulley, rotation, connector, mounting direction, and anti-rotation setup
- Review the seller’s current shipping, return, and warranty terms
- Do not order by appearance or listing title alone
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?
Send PTO Direct USA the part number from your original PTO clutch, your complete Exmark mower model number, serial number, and deck size before ordering.
FAQ
Does Exmark 135-5267 supersede to 142-3587?
Yes. The verified Exmark replacement path lists 135-5267 as superseded to 142-3587.
What Warner clutch cross-references to this replacement path?
The corresponding Warner reference is 5218-408 / 5218408.
Why are the eBay listings priced so differently?
The listings appear to target different part-number searches. One emphasizes Exmark 142-3587, while another emphasizes Exmark 135-5267 and Warner 5218-408. A higher price does not automatically indicate a different or better clutch.
Is it reasonable to choose the lower-priced listing?
Yes, when the listing still identifies the confirmed 142-3587 / 135-5267 / 5218-408 replacement path and shows the same brand, specifications, photographs, and included items. Review the current listing carefully before purchasing.
What Exmark models use this PTO clutch path?
This clutch path is confirmed on select 48-inch and 52-inch Exmark Staris S-Series models, including STS650AKC48400, STS651GKA48400, STS730AKC52400, and STS730GKA52400.
Does this clutch fit a 60-inch Exmark Staris S?
No. The 60-inch Staris S uses the separate 142-3588 / 135-1307 clutch path.
What is the advertised torque rating?
The current HD Switch HiTorque replacement listings advertise a 210 ft-lb rating compared with a 175 ft-lb OEM reference rating.
Is this a genuine Exmark or Warner clutch?
No. The current options in the linked collection are aftermarket HD Switch 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 seller’s shipping, warranty, and return terms before purchasing.