CURT 13136 Class 3 Trailer Hitch Instruction Manual

1. Introduction

This manual provides detailed instructions for the proper installation, operation, and maintenance of your CURT 13136 Class 3 Trailer Hitch. This hitch is specifically designed for select model years of the Audi Q5 and Porsche Macan, offering a 2-inch x 2-inch receiver tube. Adherence to these instructions is crucial for safe and effective use of the product.

Figure 1: The CURT 13136 Class 3 Trailer Hitch, featuring a black powder coat finish and a 2-inch receiver.

2. Safety Information

Always prioritize safety during installation and operation. Failure to follow safety guidelines can result in serious injury or property damage.

• Wear Safety Glasses: Always wear appropriate eye protection during installation.
• Weight Capacity: Never exceed the lowest-rated towing component. This hitch is rated for 5,000 lbs. Gross Trailer Weight (GTW) and 750 lbs. Tongue Weight (TW). Consult your vehicle's owner's manual for its specific towing capacity.
• Proper Torque: Ensure all fasteners are torqued to the manufacturer's specifications. Incorrect torque can lead to component failure.
• Vehicle Compatibility: This hitch is designed for specific Audi Q5 and Porsche Macan model years. Verify compatibility before installation.
• Not for Vertical Hanging Bikes: This 2-inch receiver is not compatible with vertical hanging bike racks that require bikes to be hung or mounted vertically.
• Regular Inspection: Periodically inspect the hitch and all towing components for wear, damage, or corrosion.

3. Components Included

The CURT 13136 Class 3 Trailer Hitch package includes the following:

• Class 3 Hitch (Model 13136)
• Installation Hardware (bolts, nuts, washers, spacers - specific quantities and types detailed in the separate installation sheet)

Refer to the separate installation sheet provided with your product for a complete list of hardware and specific quantities.

4. Installation

Installation of the CURT 13136 trailer hitch requires careful attention to detail. It is recommended to have a second person assist with positioning the hitch.

4.1. Tools Required

• Safety Glasses
• Torque Wrench
• Ratchet and Sockets (sizes as specified in installation sheet)
• Wire Brush (for cleaning threads)
• Spray Lubricant (optional, for exhaust hangers)
• M12-1.75 Tap (optional, for thread preparation)
• Fish Wire Tool (if provided, for guiding bolts)

4.2. Pre-Installation Steps

1. Inspect Vehicle Frame: Examine the vehicle's frame and hitch attachment points for any damage, corrosion, or obstructions. Ensure the frame is in suitable condition for installation.
2. Clean Threads: Clean any existing weld nuts or frame bolt locations using a wire brush and spray lubricant. The self-tapping bolts provided will cut threads, but pre-tapping with an M12-1.75 tap can ease installation.
3. Lower Exhaust (If Necessary): Some installations may require temporarily lowering the vehicle's exhaust system for clearance. Use exhaust pliers and a spray lubricant or soapy water mixture to carefully remove rubber hangers.
4. Remove/Trim Bumper Fascia (If Necessary): Consult your specific installation instructions. Some vehicles may require temporary removal or trimming of the bumper fascia.

4.3. Hitch Installation

1. Position Hitch: With assistance, carefully lift the trailer hitch into position beneath the vehicle. Align the hitch with the attachment points on the vehicle's frame.
2. Insert Hardware: Insert the provided bolts and spacers into the frame rails. If necessary, use a fish wire tool to guide the bolts through the frame and into position.
3. Secure with Nuts: Hand-tighten the provided hex nuts onto the bolts to hold the hitch in place.
4. Tighten and Torque: Evenly tighten all fasteners with a hand wrench. Once snug, use a torque wrench to tighten all bolts to the specific torque values indicated in the installation instructions provided with your hitch. Do not use excessive torque or an impact wrench.

4.4. Post-Installation Steps

1. Reattach Exhaust/Fascia: Reinstall any exhaust components or bumper fascia that were removed during installation.
2. Install Wiring Harness (Sold Separately): To complete your towing setup, install a custom vehicle-to-trailer wiring harness (if not already present).

5. Operating Instructions

Once installed, your CURT 13136 trailer hitch is ready for use. Always ensure proper connection and adherence to weight limits.

• Connecting a Trailer: Insert your ball mount (with appropriate hitch ball) into the 2-inch receiver tube and secure it with a hitch pin and clip. Connect the trailer coupler to the hitch ball, ensuring it is properly latched and secured.
• Safety Chains: Always attach safety chains from the trailer to the designated chain loops on the hitch. Cross the chains under the trailer coupler to prevent the coupler from hitting the ground if it detaches.
• Electrical Connection: Connect the trailer's electrical plug to your vehicle's wiring harness to ensure proper functioning of trailer lights and brakes.
• Weight Distribution: For heavier loads, consider using a weight distribution system to distribute the trailer's tongue weight more evenly across the vehicle's axles.

Figure 2: The standard 2-inch x 2-inch receiver tube, ready to accept a ball mount or other hitch-mounted accessories.

Figure 3: A truck equipped with a CURT hitch, towing a travel trailer, demonstrating typical use.

6. Maintenance

Regular maintenance ensures the longevity and safe operation of your trailer hitch.

• Cleanliness: Keep the receiver tube free of dirt, debris, and rust.
• Lubrication: Periodically lubricate the hitch pin and clip, as well as any moving parts on your ball mount or accessories.
• Corrosion Protection: The CURT 13136 features a co-cured finish of liquid A-coat and black powder coat for superior resistance to rust, chipping, and UV damage. However, regular cleaning and occasional touch-up paint can further extend its life, especially in harsh environments.
• Fastener Check: Before each towing trip, check all bolts and nuts to ensure they are properly tightened to the specified torque values.

Figure 4: CURT hitches being submerged in a liquid A-coat bath, part of the dual-coat finishing process for corrosion resistance.

7. Troubleshooting

Common issues and their potential solutions:

• Difficulty Installing Bolts: Ensure frame threads are clean. Use a wire brush and lubricant. Pre-tapping with an M12-1.75 tap can help. If bolts are self-tapping, ensure they are started correctly.
• Hitch Not Aligning: Ensure all obstructions are removed. Verify the hitch model is correct for your specific vehicle year, make, and model. Slight adjustments may be needed during initial hand-tightening.
• U-Bolt Torque Issues: Always follow the manufacturer's specified torque values. Over-tightening can damage bolts. If U-bolts are used, ensure they are tightened evenly and in stages.
• Excessive Play in Receiver: Ensure the ball mount is fully inserted and secured with a hitch pin and clip. Consider an anti-rattle device if excessive movement persists.

8. Specifications

Figure 5: Visual representation of the 2-inch receiver tube size.

Figure 6: A CURT hitch being tested in accordance with SAE J684 standards to ensure safety and durability.

9. Warranty & Support

For specific warranty information regarding your CURT 13136 Class 3 Trailer Hitch, please refer to the warranty documentation included with your product or visit the official CURT website. Warranty terms typically cover manufacturing defects and material flaws.

9.1. Customer Support

If you have any questions, require technical assistance, or need to report an issue, please contact CURT customer support directly. Contact information can usually be found on the product packaging or the official CURT website.