1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your CURT 13337 Class 3 Trailer Hitch. This hitch is designed for select Lexus NX200t, NX300, and NX300h models, offering reliable towing capabilities for various trailer types.
The CURT Class 3 Trailer Hitch is engineered for serious towing, providing a vehicle-specific fit and the necessary weight capacity for utility trailers, boat trailers, campers, snowmobile or ATV haulers, and more. It features a 2-inch receiver tube and is constructed from rugged, high-strength steel with a co-cured finish of liquid A-coat and black powder coat for superior resistance to rust, chipping, and UV damage.
Figure 1: CURT 13337 Class 3 Trailer Hitch, a robust towing solution.
2. Safety Information
WARNING: Read and understand all instructions before installation and use. Failure to follow these instructions could result in serious injury or property damage.
- Always ensure the hitch is properly installed and secured before towing.
- Never exceed the lowest-rated towing component (vehicle, hitch, or trailer).
- Regularly inspect the hitch for any signs of wear, damage, or corrosion. Replace damaged components immediately.
- Ensure all fasteners are tightened to the specified torque values.
- Use appropriate safety gear during installation, including eye protection and gloves.
- Be aware of Proposition 65 warnings regarding potential chemical exposure.
3. Parts List
The CURT 13337 Class 3 Trailer Hitch package typically includes the following components:
- CURT Class 3 Trailer Hitch (Model 13337)
- Mounting Hardware (bolts, washers, nuts as required for vehicle-specific fit)
- Installation Instructions
Note: Specific hardware may vary. Refer to the included installation sheet for exact components.
4. Setup & Installation
This section provides general guidance for installing your CURT Class 3 Trailer Hitch. For detailed, vehicle-specific instructions, always refer to the installation sheet provided with your product. Professional installation is recommended if you are not familiar with vehicle modifications.
4.1. Pre-Installation Steps
- Park the vehicle on a level surface and engage the parking brake.
- Allow the exhaust system to cool completely if the vehicle has been recently driven.
- Gather all necessary tools (e.g., wrenches, sockets, torque wrench, safety glasses, gloves).
- Locate the vehicle's frame mounting points. The hitch is designed for a custom, factory fit on select Lexus NX200t, NX300, and NX300h models.
4.2. Exhaust System Considerations
Depending on your specific Lexus NX model and year, it may be necessary to temporarily lower or remove sections of the exhaust system to gain access to the frame mounting points. For some models, particularly the NX300f, completely removing the rear section of the muffler (2 bolts and 3 hangers) may be easier than attempting to work around the exhaust tips or bumper components.
For hybrid models (e.g., NX300h), it might not be necessary to drop the exhaust at all, as it may allow enough movement with a small nudge.
4.3. Mounting the Hitch
- Clean any debris or rust from the vehicle's frame weld nuts if present.
- Carefully position the trailer hitch against the vehicle's frame rails, aligning the mounting holes on the hitch with the corresponding holes on the vehicle frame. This may require two people due to the weight and snug fit.
- Insert the provided fasteners through the hitch and into the frame. Apply a small amount of anti-seize or lubricant to bolt threads.
- Hand-tighten all bolts to ensure proper alignment before final tightening.
- Once aligned, tighten all bolts to the torque specifications provided in your product's specific installation sheet. Ensure even tightening across all fasteners.
- If the exhaust system was lowered or removed, re-install it securely.
Figure 2: The hitch features a standard 2-inch receiver tube.
Figure 3: Representative image highlighting key features such as vehicle-specific design, dual-coat finish, standard hitch receiver, and fully tested design.
Figure 4: A detailed view of the 2-inch standard hitch receiver.
Figure 5: The hitch undergoes a dual-coat finishing process, combining liquid A-coat and black powder coat for enhanced durability and corrosion resistance.
Figure 6: Every CURT Class 3 trailer hitch design is rigorously tested in real-world, on-vehicle conditions at their engineering facility, adhering to SAE J684 standards for safety.
Figure 7: The CURT trailer hitch is proudly made in the USA.
Figure 8: This hitch is designed for a no-drill installation on compatible vehicles.
4.4. Installation Video
Video 1: Official CURT video demonstrating the features and benefits of the Class 3 Trailer Hitch, including aspects relevant to installation and design.
5. Operating Instructions
Once installed, your CURT Class 3 Trailer Hitch is ready for use. Follow these guidelines for safe operation:
- Connecting a Trailer: Insert the trailer ball mount into the 2-inch receiver tube and secure it with a hitch pin and clip. Ensure the pin is fully engaged.
- Safety Chains: Always attach safety chains from the trailer to the designated chain loops on the hitch. Cross the chains under the trailer tongue to cradle it in case of detachment.
- Electrical Connections: If your trailer requires electrical power (lights, brakes), connect the appropriate wiring harness to your vehicle's towing electrical system.
- Weight Capacity: Adhere strictly to the hitch's weight capacities: 3,500 lbs. Gross Trailer Weight (GTW) and 525 lbs. Tongue Weight (TW). When using a weight distribution hitch, capacities are 4,000 lbs. WD and 525 lbs. WDTW. Never exceed the lowest-rated component in your towing setup.
- Driving with a Trailer: Drive cautiously, allowing for increased braking distances and wider turns. Be mindful of trailer sway and adjust driving habits accordingly.
- Bike Racks: Note that this hitch is not compatible with vertical hanging bikes/bike racks that require bikes to be hung/mounted vertically.
6. Maintenance
Proper maintenance will ensure the longevity and safe operation of your trailer hitch:
- Regular Inspection: Before each towing trip, inspect the hitch for any signs of rust, cracks, bends, or other damage. Check all bolts for tightness.
- Cleaning: Keep the hitch clean from dirt, salt, and road grime. Wash with mild soap and water, then rinse thoroughly.
- Corrosion Protection: The dual-coat finish provides excellent protection, but minor scratches should be touched up to prevent rust.
- Lubrication: Apply a light coat of grease to the inside of the receiver tube periodically to prevent rust and ease insertion of accessories.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Hitch does not align with frame holes during installation. | Misalignment; tight tolerances; exhaust interference. | Ensure vehicle is on a level surface. Use a second person to help align. Temporarily lower or remove exhaust if necessary. A rubber mallet or jack can assist with minor adjustments. |
| Bolts are difficult to thread. | Dirty or rusted weld nuts; cross-threading. | Clean weld nuts with a wire brush and thread chaser. Apply a small amount of lubricant to bolt threads. Ensure bolts are started by hand to prevent cross-threading. |
| Excessive trailer sway. | Improper tongue weight; overloaded trailer; strong crosswinds. | Adjust trailer load to achieve proper tongue weight (typically 10-15% of GTW). Reduce speed. Consider a weight distribution hitch or sway control device if not already in use. |
| Hitch appears rusted or chipped. | Surface damage; prolonged exposure to harsh elements. | Clean the affected area. Touch up with rust-inhibiting paint. For significant damage, consider replacement. |
8. Specifications
| Attribute | Detail |
|---|---|
| Brand | CURT |
| Model Number | 13337 |
| Hitch Class | Class 3 |
| Receiver Tube Size | 2-inch x 2-inch |
| Gross Trailer Weight (GTW) | 3,500 lbs. |
| Tongue Weight (TW) | 525 lbs. |
| Weight Distribution (WD) Capacity | 4,000 lbs. |
| Weight Distribution Tongue Weight (WDTW) | 525 lbs. |
| Material | Carbon Steel |
| Finish Type | Co-cured Liquid A-coat and Black Powder Coat |
| Product Dimensions | 50 x 26 x 12 inches |
| Item Weight | 37.2 pounds |
| Compatibility | Select Lexus NX200t, NX300, NX300h models |
| Testing Standard | SAE J684 |
9. Warranty & Support
For specific warranty information regarding your CURT 13337 Class 3 Trailer Hitch, please refer to the documentation included with your product or visit the official CURT website. Warranty terms typically cover defects in material and workmanship.
For technical support, installation assistance, or to inquire about replacement parts, please contact CURT customer service directly. Contact information can usually be found on the product packaging or their official website.
Online Resources:
- Official CURT Website: www.curtmfg.com
- Amazon Store: CURT Amazon Store
