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The long-haul operation puts heavy vehicles in situations that everyday driving doesn’t compare with. Hours of sustained high speed, heavy loads, extreme temperatures, and small breaks create strain on components that otherwise wouldn’t fail for thousands or millions of kilometers. When a vehicle goes down hundreds of kilometers away from the next maintenance shop, it becomes a mechanical and logistical nightmare in which costs escalate exponentially hour by hour.
Yet most breakdowns on the road don’t necessarily happen, at least not suddenly. With a little foresight into failure points, operators can determine when there is a problem before a roadside emergency. After all, it’s those little issues compounded during extended operations that strain something until it finally gives at the worst possible time.
Failure points of which to be aware include:
Transmission Failure Under Sustained Loading
Transmissions are under tremendous pressure during long-haul work. Operators don’t have the luxury of stop-and-go driving in the city where mechanics cool off between shifts, and the vehicle doesn’t always have a heavy load. Instead, sustained shifts in high gear cause increased pressure and heat in and up against various components that stretch the lifespan of rubber seals, gears, and clutch plates.
The problem gets worse in extensive uphill/downhill applications and if the levels are passed through city stoplights. When a transmission gets stuck in a gear, a load that’s not shifting for braking might push it past its breaking point. If there is no transmission cooler working, or the fluid has low viscosity, the physical manifestation of sustained horsepower might slip gears into inevitable breakdown. Operators who are forced to delay assessment until the vehicle has shifted might be working with significant internal wear already before it’s too late.
Transmission fluid gets changed more often than not during preventative maintenance efforts; however, specialists such as those at Heavy Automatics know that sometimes extended drain intervals work for the local delivery truck but not for those heavy-hitting units out there with serious highway mileage. Special transmission fluid for heavy-duty transmission coolers and frequent assessments will help operators discover problems before they get too out of control, problems that could leave them stranded with no help for hundreds of kilometers down the line.
What surprises most Heavy Operators is how fast a transmission can go from bad to catastrophic in long-haul work; a slipping transmission may let an operator get it home after years of reliable performance on local travel, but in the sustained drive of a longer run, it might only last a few hundred kilometers before shifting into complete failure.
Cooling System Failure Under Sustained Operation
Cooling systems are put to the test like never before with long-haul work. Radiators and water pumps and hoses, and thermostats must perform at optimal levels for the entirety of the trip. If anything falters even just slightly, the cooling system fails and takes other systems down with it.
Radiators leak because they can’t maintain fluid levels; the coolant goes bad. Coolant needs to be able to lubricate engine parts/radiators/transmission coolers without rust properties infiltrating. But for long-haul use, it degrades. If hoses are degrading over time, they get weak but might sustain pressure from local traffic; under long-haul use, however, they spring leaks.
Often, the transmission cooler is integrated into the radiator; this helps them both work as they exert tremendous amounts of heat (or cold) with sustained pushes. If any of them develop even just a small leak, coolant mixes with transmission oil, and that is enough contamination to destroy a transmission before the operator can even realize what’s going on. Regular preventative maintenance will assess potential weaknesses prior to failure at critical moments.
Brake System Failure Over Distance
Brakes have a unique challenge pertaining to long-haul work; whether they are heavy loads coming into town to steer down a mountain, needing to decelerate with a red light, or stop completely for a car bumper on Interstate 395, brakes face even more challenging situations while under sustained focus with slight variances in each application.
Brake fluid is often forgotten until it’s too late; gasoline holds moisture, and over time, it attracts it. When an operator continuously brakes hard enough over time downhill, with a lot behind it, that liquid boils. That means brake efficiency drops dramatically. Gas bubbles don’t compress as liquids do, and when an operator needs maximum stopping power, the last thing they need is poor pedal feel.
Brake linings wear down quickly than expected over time; thousands of dollars in repair costs could easily be avoided if operators only assessed minor issues. A thin lining might be salvageable with trusted rotors, but metal-on-metal wear will damage the rotors and drums beyond repair; a simple brake job becomes something more complicated and expensive.
Tire Failures Over Distance
During long-haul work, tires are seldom to blame for roadside breakdowns, but tires cause one of the most common issues while units are on the road. Yet most tire breakdowns can be easily avoided during daily inspections.
Underinflation is a huge culprit; not necessarily heat itself, but heat combined with heavy loads means that those tires are breaking down from within, not externally. Hours of driving create weaknesses that can never be assessed without a visual inspection, and oftentimes, that’s not enough to go for before proper pressures are assessed.
Tire age also matters; tires can look brand new but lose their efficiency as they lose rubber compounds. it might still have tread, but deterioration has set in from sunlight exposure or hours of high-speed driving due to miles and miles driven without assessing their value.
Electrical Problems
Electrical systems are not overly difficult to rectify in short trips; yet long-distance travel wires are under substantial pressure due to charging batteries and alternators needing to operate cooling and refrigeration systems/in in-cab electronics, and more.
Usually, issues occur due to connectors that start to corrode as well as insulation that rubs off wires; these fail in conditions due to vibration cycles or over time, prolonged use and movement aren’t effective on the road, and this could leave an operator dead in their tracks (with no clear cause) instead of waiting for roadside assistance.
Fuel Issues Miles From Service
Fuel systems might fail due to filtration prior, or extensive pumping power over time that’s no longer available after extended use, but usually these come from problems based on fuel quality or age.
Water settles in fuel tanks for normal operations; it also contributes particles for filtration, but when stirred up over paved roads, it gets pumped through effectively; each mile another grain gets along for a full load, and when it’s in the line, the vehicle suffers.
Fuel filters need extensive replacement over hours worked, not just miles, and this occurs when fuel gets too dirty, and the system can’t push power effectively anymore. And while this might not be seen for local operations, after 1,000 kilometers, it’s clear there is a problem.
Prevention Beats Roadside Repairs
The bottom line is that all of these problems are wear-and-tear. They take minor inconveniences that operators can address in daily operations and turn them into something critical overnight due to sustained loading and power over time.
Long-haul operators need preventative maintenance schedules set up when there is specific work involved, not just miles driven. The more often specific assemblies are given attention from professionals, the less likely problems will arise down the road when makeup assessments fail miles from civilization.
Operators who believe maintenance is work should treat it as an investment instead; those who can successfully keep problems from stranding units down the road from everyone get paid for their reliability, versus pay premiums for downtime operating equipment that was completely avoidable had someone only done their job properly.
*This article is based on personal suggestions and/or experiences and is for informational purposes only. This should not be used as professional advice. Please consult a professional where applicable.