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Archive for October 1st, 2010

Heavy Hauler and Low Boy Wheelbase and Frame Rail Specs

Friday, October 1st, 2010

FixonRoad.com™ truck repair blog aims to give you important information regarding trucking industry news.  As you may or may not be aware know, Big rigs and heavy haulers that transport loads over 120,000 pounds (GCW) are required to specify their trucks appropriately in respect to durability and power.

Trucks that are not accurately specified can have an adverse effect on truck fuel mileage and other operating costs including truck repair.  It is important to correctly specify the truck’s wheelbase – especially when heavy haulers are involved.

Truck Repair Service Heavy Haulers

The heavy hauler industry standard for rear axles comes in at 46,000-pounds. However, in extreme cases, there are axles with capacities upwards of 150,000 pounds.

The length and weight regulations differ from state to state.  Some states follow the Federal Bridge Formula and other states have their own set of trucking requirements.

In any event, it is crucial that truck wheelbases should not be any longer than is necessary as there will be a reduction in maneuverability with respect to heavy haul tractors on congested roads.

Reinforced frame rails are sometimes needed in order to haul heavy loads.  To put it simply, the longer the wheelbase – the more axle capacity – which means that the frame will need to be more rigid.

Another factor in heavy hauler performance is the rear axle ratio.  There needs to be a balance between cruise speed and low gearing. Heavy haulers traveling over long distances at highway speeds should select ratios that are low as possible.

Rear axles need to be durable.  The heavy hauler industry standard for rear axles comes in at 46,000-pounds.  However, in extreme cases, there are axles with capacities upwards of 150,000 pounds.

Axle selection also depends on traction.  On slippery roads or muddy job sites, it may be a good idea to choose Automatic Traction Control on the antilock brake systems.

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