Freightliner Cascadia Air Tank - Operation, Maintenance & Replacement Costs

Overview of the Freightliner Cascadia Air Tank

The air tank on the Freightliner Cascadia plays a crucial role in the truck's air brake system. It stores compressed air that is used to apply the brakes when the driver presses the brake pedal. Having enough air pressure in the tank is vital for safe operation of the brakes.

The Cascadia comes equipped with a 60 gallon air tank made of aluminum. Its light weight but durable construction provides reliable air storage to feed the brakes. The tank is mounted on the driver's side frame rail behind the cab.

Air Tank Operation

Air enters the Cascadia's air tank via the vehicle's air compressor. The compressor is belt-driven off the engine and pumps air into the tank, raising the pressure. The governor cut-out pressure is typically around 120-140 psi.

When the brakes are applied, compressed air flows from the tank to the brakes through a series of valves and hoses. This pushes the brake pads against the drums or rotors to slow the vehicle down. The air pressure drop is sensed by the compressor governor, which kicks the compressor back on to refill the tank when pressure drops below cut-in (around 100 psi).

Inspecting and Maintaining the Air Tank

To keep the air tank working properly on a Freightliner Cascadia, regular inspections and maintenance are recommended. The tank should be drained frequently, such as daily or weekly, to remove condensation that can contaminate the air lines. This is done via a drain valve at the bottom of the tank.

Watch for signs of leaks or damage to the tank. Listen for air leaks and inspect mounting brackets. Repair minor leaks promptly and replace deteriorated air lines. If severe corrosion is found, the tank may need to be replaced with a new or reconditioned one.

Also check that the pressure relief valve is working properly - it should open at around 150 psi to protect the tank from excess pressure buildup.

Replacing the Air Tank

With time, air tanks may become too corroded or damaged to repair. Replacement Cascadia air tanks are available new or remanufactured from Freightliner dealers and aftermarket suppliers.

Installation involves depressurizing and draining the air system, disconnecting air lines and fasteners, transferring necessary accessories like the relief valve to the new tank, then mounting and reconnecting it. Refill the air system and check for leaks.

When replacing the air tank or servicing the air system, refer to a Cascadia service manual. Getting the job done correctly is critical, as the air tank and brakes are essential safety components.

Maintaining Adequate Air Pressure

Maintaining proper air pressure in the Cascadia's air tank is imperative. The system should build to governor cut-out pressure within a specified time period, usually around one minute. Air pressure should hold steady and not leak down excessively when parked.

If air pressure is low, leaks are likely present in air lines, valves, brake chambers or air bags. These should be tracked down and fixed to prevent air loss. Slow air compressor build up can indicate worn compressor rings or faulty valves.

The Cascadia's air dryer must also be working properly to prevent moisture buildup in the tank. Change filters per maintenance schedules and keep the air dryer desiccant in good condition.

With routine draining of the air tank, leak checks and component replacement as needed, the Cascadia air system should provide reliable service. Always ensure pressures are in spec before operating the truck.

Air Tank Replacement Costs

When it becomes necessary to replace a degraded air tank on a Freightliner Cascadia, parts and labor costs will apply. The air tank itself may range in cost from $150-500 or more depending on whether a new or remanufactured tank is chosen. Add a couple hours of shop labor for installation.

Related replacement parts like air valves, fittings, lines and brake chambers may also be needed, adding to parts expenses. Shop supply and environmental fees also factor in. In total, expect air tank replacement to typically cost $500-1000 or more for parts and labor.

Proactive inspections and ongoing maintenance can maximize the lifespan of the original air tank and minimize operating costs. But with hundreds of thousands of miles of use, replacement will eventually be required. Running with low air pressure or a damaged tank compromises safety, so repair or replacement is money well spent.

Key Takeaways

The 60 gallon aluminum air tank on the Freightliner Cascadia handles a crucial job - supplying compressed air to operate the brake system. Inspecting and servicing the tank as part of routine maintenance prevents issues like air leaks or moisture-contaminated air. With proper care, the OEM air tank should last for years before needing replacement. When it's time for a new tank, costs typically fall between $500-1000 including parts and labor.

FAQs

How does the air tank work on a Cascadia?

The air tank stores compressed air generated by the engine-driven air compressor. When the brakes are applied, air flows from the tank to the brakes to activate them. The compressor kicks in to refill the tank when air pressure drops below a certain threshold.

What is the capacity of the Cascadia air tank?

The Cascadia comes equipped with a 60 gallon aluminum air tank mounted on the frame behind the cab.

How often should I drain the air tank?

To remove moisture, the air tank drain valve should be opened daily or at least weekly. This moisture contamination can degrade the air system.

What are signs the air tank needs replacement?

Severe corrosion, leaks that cannot be repaired, air pressure issues and problems maintaining system pressure can indicate a worn out air tank needing replacement.

What are costs to replace a Cascadia air tank?

The replacement air tank itself may cost $150-500 or more. With 2 hours of shop labor, supply fees and related repairs, expect total costs between $500-1000+ to replace the air tank.