Installation Instructions for Mercedes GLK350 (All Models, Including 4-Matic & RWD)

Part Numbers:

• 75774
• 87636
• 44690
• 78303 U-Haul

Wiring Access Location:

• SUV3, SUV4

Tools Required:

• Wrenches: 3/4", 7/8"
• Other Tools: Tape
• Drill Bits: None

Step-by-Step Instructions:

1. Prepare the Vehicle:

   • Remove or bend up small plastic fascia tabs protruding from the bottom of the bumper fascia before installing the hitch.

2. Install Clamp Brackets:

   • Attach the clamp brackets to the vehicle's crossmember using bolts and lock washers.
   • Torque the bolts to 75 lb-ft (102 N*m) before raising the hitch into place.
   • Ensure the bracket with weld nuts is on the forward side of the crossmember. The offset hole should face the passenger side.

3. Prepare the Hitch:

   • Tape blocks and bolts to the hitch uprights as shown in the instructions. Ensure the blocks are positioned with their long sides vertical.

4. Position the Hitch:

   • Raise the hitch under the vehicle, being careful not to dislodge the taped bolts.
   • Loosely attach conical washers and nuts to hold the hitch in place.

5. Secure the Forward Block:

   • Rotate the hitch and insert a 5/8” thick block vertically between the hitch bar and the clamp bracket.
   • Secure with a 3” long hex bolt and conical washer. Torque the 3” bolt and the two rearward 1/2” nuts to 75 lb-ft (102 N*m).

6. Final Torque:

   • Tighten all fasteners to the specified torque values.

Hardware List:

• Qty (2): Carriage Bolt – 1/2"-13 x 1-1/2" GR5
• Qty (2): Lock Washer – 1/2"
• Qty (3): Conical Toothed Washer – 1/2"
• Qty (1): Hex Bolt – 1/2"-13 x 3" GR5
• Qty (2): Hex Nut – 1/2"-13
• Qty (1): Block – 5/8" x 1-1/2" x 2"
• Qty (2): Hex Bolt – 1/2"-13 x 1-1/2" GR5
• Qty (2): Block – 1/4" x 1-1/2" x 2"

Safety Notes:

• Check the hitch frequently to ensure all fasteners and the ball are properly tightened.
• If the hitch is removed, plug all holes in the trunk pan or body panels to prevent water and exhaust fumes from entering.
• Replace any damaged hitch or ball immediately.
• Observe safety precautions when working beneath the vehicle and wear eye protection.
• Do not cut access or attachment holes with a torch.

Specifications:

• Hitch Type: Weight Carrying (Ball Mount)
  • Max Gross Trailer Weight: 4,000 lbs (1,814 kg)
  • Max Tongue Weight: 600 lbs (272 kg)

Manufacturer Notes:

• Tighten all 1/2"-13 GR5 fasteners to 75 lb-ft (102 N*m).
• Complies with safety specifications and requirements for connecting devices and towing systems of the state of New York, V.E.S.C. Regulation V-5, and SAE J684.

Installation Instructions

Part Numbers:

• 75774
• 87636
• 44690
• 78303 U-Haul

Wiring Access Location:

• SUV3, SUV4

Tools Required:

• Wrenches: 3/4", 7/8"
• Other Tools: Tape
• Drill Bits: None

Step-by-Step Instructions:

1. Prepare the Vehicle:

   • Remove or bend up small plastic fascia tabs protruding from the bottom of the bumper fascia before installing the hitch.

2. Install Clamp Brackets:

   • Attach the clamp brackets to the vehicle's crossmember using bolts and lock washers.
   • Torque the bolts to 75 lb-ft (102 N·m) before raising the hitch into place.
   • Ensure the bracket with weld nuts is on the forward side of the crossmember. The offset hole should face the passenger side.

3. Prepare the Hitch:

   • Tape blocks and bolts to the hitch uprights as shown in the instructions. Ensure the blocks are positioned with their long sides vertical.

4. Position the Hitch:

   • Raise the hitch under the vehicle, being careful not to dislodge the taped bolts.
   • Loosely attach conical washers and nuts to hold the hitch in place.

5. Secure the Forward Block:

   • Rotate the hitch and insert a 5/8” thick block vertically between the hitch bar and the clamp bracket.
   • Secure with a 3” long hex bolt and conical washer. Torque the 3” bolt and the two rearward 1/2” nuts to 75 lb-ft (102 N·m).

6. Final Torque:

   • Tighten all fasteners to the specified torque values.

Hardware List:

• Qty (2): Carriage Bolt – 1/2"-13 x 1-1/2" GR5
• Qty (2): Lock Washer – 1/2"
• Qty (3): Conical Toothed Washer – 1/2"
• Qty (1): Hex Bolt – 1/2"-13 x 3" GR5
• Qty (2): Hex Nut – 1/2"-13
• Qty (1): Block – 5/8" x 1-1/2" x 2"
• Qty (2): Hex Bolt – 1/2"-13 x 1-1/2" GR5
• Qty (2): Block – 1/4" x 1-1/2" x 2"

Safety Notes:

• Check the hitch frequently to ensure all fasteners and the ball are properly tightened.
• If the hitch is removed, plug all holes in the trunk pan or body panels to prevent water and exhaust fumes from entering.
• Replace any damaged hitch or ball immediately.
• Observe safety precautions when working beneath the vehicle and wear eye protection.
• Do not cut access or attachment holes with a torch.

Specifications:

• Hitch Type: Weight Carrying (Ball Mount)
  • Max Gross Trailer Weight: 4,000 lbs (1,814 kg)
  • Max Tongue Weight: 600 lbs (272 kg)

Manufacturer Notes:

• Tighten all 1/2"-13 GR5 fasteners to 75 lb-ft (102 N·m).
• Complies with safety specifications and requirements for connecting devices and towing systems of the state of New York, V.E.S.C. Regulation V-5, and SAE J684.

Attention: This is a summary of the installation procedure. For complete installation instructions, including diagrams and detailed information from the manufacturer, please download the full installation PDF.

Technical Support:

For technical support and assistance, our team of experts is available to help. You can reach our tech support by visiting www.trailerjacks.com or calling 877-869-6690.

Warranty:

For complete warranty instructions, please download the full installation PDF.