Woodruff Key - 112139430/0
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eBayGenuine Mountfield 827M, T30M, Rider 72M Woodruff Key 3/16""x3/4"" - 112139430/0
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£6.99
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Product Information
Full details
The GGP Woodruff Key (part number 112139430/0) is an essential mechanical component designed for Mountfield lawn mower owners who need to secure their flywheel or pulley to the crankshaft. It is a critical part for ensuring the engine runs with proper timing and stability, making it ideal for routine maintenance or repair tasks on specific Mountfield ride-on and walk-behind models. While this component is highly durable and precise, users should be aware that correct installation is vital to prevent shearing and potential engine damage during operation.
All features
| Model Part Number | 112139430/0 |
|---|---|
| Brand | GGP |
Extended Product Information
FAQs
What is the function of a Woodruff key?
It serves as a locking device to align and secure the flywheel onto the crankshaft, maintaining correct ignition timing.
Can I use a generic key instead of part 112139430/0?
It is strongly recommended to use the genuine GGP part to ensure the material hardness and dimensions match your specific Mountfield engine requirements.
Does this key fit all Mountfield mowers?
No, it is designed specifically for the models listed (e.g., 827M, T30M, etc.). Always cross-reference your mower's serial number or manual.
How do I know if my Woodruff key has sheared?
Symptoms include a sudden loss of engine power, an engine that turns over but won't catch, or backfiring during starting attempts.
Do I need special tools to replace this?
Yes, a flywheel puller is typically required to remove the flywheel and access the keyway.
Troubleshooting
Engine will not start after replacing the key
Verify that the flywheel is fully seated and that the key did not shift or shear during the installation of the flywheel nut.
Flywheel nut is loose or keeps backing off
Ensure the flywheel nut is torqued to the specific manufacturer setting and inspect the threads for wear.
Pros and Cons
Pros
- Ensures exact timing and alignment for engine components
- Prevents internal engine damage by acting as a controlled failure point
- Genuine OEM quality guarantees compatibility and longevity
- Affordable maintenance part for common engine repairs
Cons
- Requires proper tools for flywheel removal and installation
- Must be matched specifically to the mower model and engine type
- Incorrect installation can lead to immediate failure
Setup, Compatibility & Care
To install this key, you will need a flywheel puller and a torque wrench to ensure the flywheel nut is tightened to manufacturer specifications. This part is compatible with a wide range of Mountfield models, including:
| Series | Compatible Models |
| :--- | :--- |
| Ride-on Riders | 827M, 72M |
| Standard Mowers | T30M, 1125M, 1228M, 1235M, 1236M, 1330M, 1335M, 1430M, 1435E, 1436M |
Always ensure the crankshaft slot and the flywheel slot are clean and free of debris before insertion. Apply a light coating of machine oil to prevent corrosion, and never use a hammer to force the flywheel onto the key, as this can damage the key or the crankshaft taper.