2017 Kenworth T680 Wheel Alignment Specifications

Quick reference

Adjustability

On the 2017 Kenworth T680, front axle camber and caster are typically adjusted using eccentric bushings or shims, depending on the specific axle and suspension configuration. Front toe is adjustable via tie rod adjustments. For the rear axles, individual toe and thrust angle are generally adjusted through shims or eccentric mounts at the spring hangers or axle seats. In some cases, specialized tools or aftermarket components like adjustable torque rods may be necessary for fine-tuning rear axle alignment on heavy-duty trucks. SAI (Steering Axis Inclination) is generally not adjustable and is determined by the kingpin inclination and steering knuckle design; if SAI is out of specification, it often indicates bent or damaged suspension components.

Recommended adjustment hardware

For most adjustments on the 2017 Kenworth T680, standard heavy-duty shims, eccentric bushings, and tie rod sleeves are used. While the factory typically provides robust adjustment mechanisms, aftermarket solutions like specialized kingpin shims or adjustable torque arms may be considered for vehicles experiencing persistent alignment issues or those operating under extreme conditions. Always ensure any aftermarket hardware is rated for heavy-duty applications and is compatible with the Kenworth T680’s specifications.

Symptoms of bad alignment

Misalignment on a heavy-duty truck like the Kenworth T680 can manifest in several ways, severely impacting tire life, fuel economy, and driving safety. Common symptoms include:

• Uneven Tire Wear: This is the most prevalent sign. Feathering (one side of the tire tread is worn smooth while the other side is sharp) often indicates excessive toe. Cupping or scalloping (alternating high and low spots around the circumference of the tire) can point to worn suspension components, but can also be exacerbated by alignment issues. Excessive wear on one edge of the tire (either the inner or outer edge) usually indicates too much positive or negative camber.
• Steering Wheel Not Centered: If your steering wheel is off-center when driving straight, it's a strong indicator of toe misalignment.
• Vehicle Pulling: The truck may consistently pull to one side, requiring constant steering correction to stay in a straight line. This can be caused by uneven caster settings or significant thrust angle issues.
• Loose or Wandering Steering: The truck may feel unstable, requiring frequent small adjustments to maintain its path, often a sign of insufficient caster or excessive toe.
• Increased Fuel Consumption: Misaligned axles create increased rolling resistance, leading to reduced fuel efficiency.
• Vibrations: While less common for alignment issues alone, severe misalignment can contribute to vibrations, especially at higher speeds.

When to align

Regular alignment checks are crucial for heavy-duty trucks. It is highly recommended to have your 2017 Kenworth T680 aligned in the following situations:

• After any suspension or steering component replacement: This includes kingpins, tie rod ends, drag links, leaf springs, air bags, or axle components.
• After significant impacts: Hitting a large pothole, curb, or road debris can knock your alignment out of specification.
• When installing new tires: Proper alignment maximizes new tire life.
• If you notice any of the symptoms of bad alignment: Don't wait for tire wear to become severe.
• During routine maintenance: Many fleet maintenance schedules include annual or semi-annual alignment checks.
• After an accident: Even seemingly minor impacts can affect frame and suspension geometry.

Typical alignment cost

The cost of a heavy-duty truck alignment for a vehicle like the Kenworth T680 can vary significantly based on location, shop rates, and the complexity of the adjustments needed. Generally, you can expect to pay anywhere from $150 to $500 or more per axle. If worn or damaged components need to be replaced before an alignment can be performed, the total cost will be higher due to parts and labor. Thorough heavy-duty truck alignments often involve checking multiple axles, so be sure to inquire about total cost for a full vehicle alignment.

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