The suspension systems on today’s trucks are lighter — and tougher — than ever before. And that’s good news for fleet owners and the industry in terms of reduced fuel use and longer maintenance intervals.

But because new truck suspensions are so dependable, some fleets have been lulled into thinking that they don’t need routine inspection or maintenance. In other words, torque rods, bushings and other suspension components don’t get much attention unless a driver complains about comfort or handling, or if tire patterns on a vehicle show signs of excessive or premature wear.

That’s bad practice, of course. Here are several reasons why.

  • Suspension components are a seven-point CSA violation if inspectors find signs of wear of damage. Only tire defects and driving an out-of-service vehicle are rated at a higher severity on the CSA scale.
  • Worn torque rods can affect a driver’s ability to control a vehicle in corners, and when accelerating and braking. Torque rods that are damaged or loose can also make for an uncomfortable ride for drivers’ backs. So be alert for premature wear on a vehicle’s drive axle or steer axle tires, which is one of the first signs of worn or loose torque rods.
  • Deteriorated bushings can permit trailers to sway and cause their tires to rub against suspension frame hangers. If you notice new or unusual rattling sounds from a vehicle, check its torque rods for worn or damaged bushings.

Vehicles that show signs of worn torque rods or bushings should be taken off the road and serviced to protect drivers and prevent tire damage.

What to Look for in Replacement Components
Heavy-duty trucks require heavy-duty suspension components. For fleets, the best choice may be torque rods with rotating pins in the bushings and two-piece weldable rods. Both eliminate the need to stock multiple parts for fleets that have limited storage space.

For bushings, consider polyurethane replacements instead of rubber. Polyurethane is impervious to oil, grease, diesel fuel and cleaning solvents, which means that it will hold up longer than rubber counterparts. Also, polyurethane is at least twice as strong as rubber. That means you can expect to replace polyurethane bushings less frequently, which should save your fleet money on replacement components and downtime over the life of a vehicle.

The expert technicians at your local Mack dealership can work with you to maintain your vehicle’s suspension system through regular inspection and maintenance of torque rods, bushings and other key components. You can find complete suspension kits and individual parts at the SELECT Part Store™. As a SELECT member, you’ll gain online access to parts availability, pricing and ordering, as well as regular discounts. If you haven’t joined yet, become a SELECT member today for free!

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