Introduction
Welcome to your McGard 74042 Trailer Wheel Locks. This manual provides essential information for the proper installation, use, and maintenance of your wheel locks, ensuring reliable security for your boat trailer.
Product Overview
The McGard 74042 wheel lock set is designed to protect your boat trailer's wheels from theft. Each set includes two wheel locks and a unique key. These locks are crafted from high-quality, through-hardened steel with a triple-nickel chrome plating for durability and corrosion resistance.
- Two (2) McGard Wheel Locks
- One (1) Unique Wheel Lock Key
Installation Instructions
Follow these steps to correctly install your McGard 74042 trailer wheel locks.
- Ensure your trailer is parked on a level surface and the parking brake is engaged. For safety, consider chocking the wheels.
- Identify one lug nut on each wheel that you wish to replace with a McGard wheel lock. It is recommended to replace one lug nut per wheel.
- Using a lug wrench, carefully remove the chosen lug nut from the wheel.
- Align a McGard wheel lock with the wheel stud.
- Place the unique McGard wheel lock key onto the wheel lock.
- Hand-tighten the wheel lock onto the stud, ensuring it threads smoothly.
- Using the lug wrench and the McGard key, tighten the wheel lock to the manufacturer's recommended torque specifications for your trailer's lug nuts. Do not overtighten.
- Repeat the process for the second wheel lock on the other wheel.
- Store your unique McGard wheel lock key in a secure, memorable location, separate from your vehicle keys. Losing this key will make wheel lock removal difficult.
Important: The thread size for these wheel locks is 1/2 x 20. Confirm this matches your trailer's wheel studs before installation.
Removal Instructions
To remove the McGard wheel locks, follow these steps:
- Locate your unique McGard wheel lock key.
- Place the key onto the wheel lock.
- Using a lug wrench, loosen the wheel lock by turning counter-clockwise.
- Once loosened, remove the wheel lock and key.
- If replacing the wheel, install a standard lug nut and tighten to specifications.
Maintenance
To ensure the longevity and appearance of your McGard wheel locks:
- Regularly clean the chrome finish with a mild automotive soap and water.
- Avoid abrasive cleaners or harsh chemicals that can damage the chrome plating.
- Periodically check the torque of the wheel locks to ensure they remain securely fastened.
- Keep the wheel lock key clean and free of debris.
Troubleshooting
Difficulty Removing Wheel Lock
If you encounter difficulty removing a wheel lock:
- Ensure the key is fully seated onto the lock pattern.
- Apply steady, firm pressure to the lug wrench. Avoid sudden jerking motions.
- If the lock is seized, a small amount of penetrating oil applied to the threads may help, but avoid getting it on the wheel finish.
Lost Wheel Lock Key
If your unique McGard wheel lock key is lost:
- Contact McGard customer support with your key code (if available) or vehicle information to obtain a replacement key.
- In emergency situations, professional assistance from a tire shop or mechanic may be required for removal without the key.
Specifications
| Feature | Detail |
|---|---|
| Model Number | 74042 |
| Thread Size | 1/2 x 20 |
| Material | Through-hardened Alloy Steel |
| Finish | Triple-Nickel Chrome Plating |
| Recommended Use | Boat Trailers with Steel or Alloy Wheels |
| Item Weight | 0.01 Ounces (per lock) |
| Product Dimensions | 2 x 6 x 8 inches (packaging) |
Note: Specifications are subject to change without notice.
Warranty and Support
Limited Lifetime Warranty
McGard wheel locks are guaranteed not to rust, chip, or peel for life. This warranty covers defects in material and workmanship under normal use. For warranty claims, please retain your proof of purchase.
Customer Support
For technical assistance, replacement keys, or warranty inquiries, please contact McGard customer support. Refer to the official McGard website for current contact information.