Introduction
This manual provides essential instructions for the safe and effective installation, operation, and maintenance of the Arnold MTD Genuine Parts Xtreme 50-Inch Blade Set. These blades are designed as replacement parts for specific MTD, Cub Cadet, Troy-Bilt, Craftsman, and White lawn mowers with 50-inch cutting decks. Please read this manual thoroughly before attempting any installation or maintenance procedures.
Safety Information
WARNING: Always exercise extreme caution when handling mower blades. They are sharp and can cause severe injury. Wear heavy-duty gloves and eye protection during installation and maintenance.
- Before performing any work on your lawn mower, ensure the engine is off and the spark plug wire is disconnected to prevent accidental starting.
- Allow the engine and blades to cool down before handling.
- Use appropriate tools for blade removal and installation.
- Ensure the mower is stable and supported before working underneath it.
- Never operate a mower with damaged, bent, or improperly installed blades.
Package Contents
The Arnold MTD Genuine Parts Xtreme 50-Inch Blade Set typically includes:
- Three (3) Xtreme 50-Inch Mower Blades (Model 490-110-0139)
Image: Three Arnold MTD Xtreme 50-Inch Mower Blades, shown from a top-down perspective, highlighting their design and star-shaped center hole.
Compatibility
These blades are designed to replace OEM part numbers 942-04053C, 942-04053B, 942-04053, 742-04053C, 742-04053B, 742-04053A, and 742-04053. They are compatible with various 50-inch cutting deck models, including but not limited to:
- Troy-Bilt Models: TB2450 (2013-2014), Super Bronco (2014)
- Craftsman Models: ZTL7000
- MTD Gold Models: RZT50
- White Models: ZT-50, ZT-5000, LT-5000, LT950H, GT950H
- Cub Cadet Models: LGT1050, LGTX1050, LTX1050KH, LTX1050KW, RZT-L50KH, RZT-L50KW, RZT-S50, RZT-S50KH, RZT-S50KW
Important: Always verify your specific mower model and existing blade part numbers before purchasing and installing to ensure proper fitment.
Installation Instructions
- Prepare the Mower:
- Park the mower on a flat, level surface.
- Engage the parking brake.
- Turn off the engine and remove the ignition key.
- Disconnect the spark plug wire to prevent accidental starting.
- Allow the engine and cutting deck to cool completely.
- Access the Blades:
- Refer to your mower's owner's manual for specific instructions on how to safely raise the cutting deck or tilt the mower to access the blades. Ensure the mower is securely supported to prevent it from falling.
- Remove Old Blades:
- Using a block of wood to prevent the blade from turning, loosen and remove the blade mounting bolt(s) with a wrench. Note the orientation of the old blades for correct installation of the new ones.
- Carefully remove the old blades. Dispose of them properly.
- Install New Blades:
- Position the new Arnold Xtreme blades onto the blade spindle, ensuring the cutting edge faces the correct direction (usually upwards towards the deck). The star-shaped center hole should align perfectly with the spindle.
- Reinstall the blade mounting bolt(s) and washer(s).
- Tighten the bolt(s) securely to the torque specifications provided in your mower's owner's manual. Typically, this is between 70-90 ft-lbs (95-122 Nm). Do not overtighten.
- Final Steps:
- Lower the mower deck or return the mower to its operating position.
- Reconnect the spark plug wire.
- Test the mower in a clear area to ensure proper operation and cutting.
Image: An angled view of three Arnold MTD Xtreme 50-Inch Mower Blades, showing the mulching teeth and the star-shaped mounting hole.
Operating Guidelines
Once installed, these blades function as standard mulching/cutting blades for your compatible lawn mower. Always follow the operating instructions provided in your mower's owner's manual. Ensure the cutting deck is set to the appropriate height for the grass conditions. Avoid cutting wet grass or excessively tall grass, which can strain the mower and reduce cutting efficiency.
Maintenance
Regular maintenance of your mower blades is crucial for optimal cutting performance and safety.
- Inspection: Periodically inspect the blades for sharpness, bends, cracks, or excessive wear. Replace blades that are severely damaged or worn.
- Sharpening: Blades can be sharpened using a blade sharpener or file. Ensure the blade remains balanced after sharpening to prevent vibration. If you are unsure, consult a professional.
- Replacement: Replace blades annually or more frequently depending on usage and terrain. Dull blades tear grass, leading to an unhealthy lawn and increased fuel consumption.
- Cleaning: After each use, clean grass clippings and debris from the underside of the mower deck and blades to prevent buildup and maintain balance.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Poor cutting quality (uneven cut, torn grass) | Dull or damaged blades; incorrect blade installation; cutting wet or excessively tall grass. | Sharpen or replace blades; ensure blades are installed correctly and tightened to specifications; avoid cutting wet/tall grass. |
| Excessive vibration during operation | Unbalanced blades (due to damage or improper sharpening); loose blade mounting bolts. | Inspect blades for damage and balance; ensure blade bolts are tightened to specifications. Replace unbalanced blades. |
| Blades do not fit the mower deck | Incorrect blade model for your mower. | Verify your mower's model number and the required OEM blade part number against the compatibility list in this manual. Ensure the blade length and center hole type (star-shaped) match your mower's requirements. |
Specifications
- Model Number: 490-110-0139
- Product Dimensions (each blade): Approximately 17.63 x 2.37 x 2 inches
- Item Weight (set of 3): Approximately 6 pounds
- Manufacturer: MTD (Brand: Arnold)
- Blade Type: Xtreme Mulching/Cutting
- Center Hole Type: Star-shaped
- Replaces OEM Part Numbers: 942-04053C, 942-04053B, 942-04053, 742-04053C, 742-04053B, 742-04053A, 742-04053
Image: An Arnold MTD Xtreme 50-Inch Mower Blade displayed in its retail packaging, showing product branding and specifications.
Warranty Information
This product is covered by the manufacturer's standard warranty against defects in materials and workmanship. For specific warranty terms and conditions, please refer to the documentation included with your purchase or visit the official Arnold/MTD website. Keep your proof of purchase for warranty claims.
Support
For technical assistance, replacement parts, or further inquiries, please contact Arnold/MTD customer support. Contact information can typically be found on the product packaging or the official manufacturer's website.
Online Resources: MTD Products Official Website