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Key,​ Woodruff

Part Number: X-42-15-S
Availability: 25+ in stock
Price: $2.99
Ships within 1 business day
Product Information
Manufacturer: Kohler, Toro
Product Number: X-42-15-S
Classification: Part
Weight: 0.01 lbs.
Shipping: Ships Worldwide
This is an authentic Kohler replacement part that has been sourced from the original manufacturer to be used with small engines. The metal woodruff key is used to link a rotating shaft and gear. The key will fit into the slot on the shaft and match a keyway in the gear. This item is sold as an individual replacement part.

This part is compatible with the following machines:

Expand the 150+ compatible machines
Products Compatibility

This item works with the following types of products:

  • • Engine
Questions & Answers

Is this a correct fit with above mentioned model? I have seen square shaped and another Is like 1/2 moon shaped. Any difference between the two shapes. Thanks
Joe for model number Kholer 21 sv 610-0212 asked on 2022-04-30
Hi Joe, Thank you for your question. Yes, this would be the correct key for your engine. Woodruff keys are used on shafts that are 2-1/2 inches in diameter. The square key is used on shafts with a 1 inch diameter. If you need help placing an order for the keys, customer service is open 7 days a week and anyone will be happy to assist you. Please feel free to give us a call. We look forward to hearing from you!
What is symptom of sheared woodruff key? My starter engages the flywheel and spins the flywheel but not the motor.
Sam for model number PS-CH670-0011 asked on 2021-09-02
Hello Sam, thank you for your question. When your woodruff key is sheared, the engine may misfire noticeably, run rough, backfire, be difficult to restart, be hot, or lack power. If the starter motor spins but does not crank the engine, you likely have a problem with a faulty or damaged battery, Incorrect rotation due to reversed motor polarity or reverse battery connections, pinion gear issues, or the starter motor clutch is slipping. We hope this helps!
I also saw a total square one . Ur part number 25 340 04S Is this one better.
Heck for model number Sv600s-0018 asked on 2019-12-02
Hello Heck, thank you for your inquiry. The correct key for your model is part number X-42-15-S. I hope this information helps.
Will this work on riding lawn mower?
Heck for model number SV600S-0018 asked on 2019-12-02
Hello Heck, thank you for your inquiry. Woodruff keu X-42-15-S is compatible with your model SV600-0018. I hope this information helps!
Repair Instructions: Submitted by Customers Like You
1 of 2 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Key, Woodruff - X-42-15-S
Oil Seal - 20 032 08-S
Repair Difficulty:
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Socket set, Wrench Set, impact, fiy wheel puller, small hammer.
Remove bolt from crank, pull pulley off of crank, remove nut from fly wheel use puller to remove the fly wheel.Replace seals on sump and top of block fly wheel side, put new woodruff key in bottom slot put pulley back on and bolt down. Put fly wheel back on make sure key is in place torque fly wheel nut to specs.
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Average Rating (out of 5):
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  • First repair attempt...worked like a charm!
    Not a fan of USPS delivery. Part arrived a day late, however, once installed after watching a few online videos my tractor started right up! Bought a spare, just in case!
    Guest - April 13, 2021 Verified Purchase
    Verified Purchase
    eReplacementParts Team
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    Product Information
    Manufacturer: Kohler, Toro
    Product Number: X-42-15-S
    Classification: Part
    Weight: 0.01 lbs.
    Shipping: Ships Worldwide

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