Why tire pressure gets so much attention
On a large machine, the tires are among the most expensive wear items and also a leading cause of unplanned stops. They carry the full weight of the machine and its load, often over rough ground, and the air inside them is what carries most of that weight. A tire that is run at the wrong pressure does not carry the load as designed.
Pressure that is too low lets the sidewall flex more with every turn of the wheel. Flexing creates heat, and heat weakens the rubber and internal structure, which can shorten tire life or lead to failure. Low pressure also tends to raise rolling resistance and wear, which can cost fuel and traction. Pressure that is too high can make the tire stiffer, so it may cut more easily, ride harder and wear unevenly in the center of the tread. The right pressure depends on the tire, the load and the work, and it is set from the tire maker’s and vehicle maker’s guidance. Nobody should pick a number by guesswork.
What a monitoring system does
A tire pressure monitoring system, or TPMS, measures the pressure inside each tire and tells the operator or a control center when something is wrong. Many industrial systems also measure temperature, because a tire that is warming faster than normal can signal an under-inflation problem, a brake issue or an overload before the pressure alone looks abnormal.
Applications range from mine haul trucks and loaders to construction machinery, forestry vehicles and tires on long-haul commercial trucks. In mining especially, tire care is a major operating topic, and the overview of mining machinery explains why trucks are such an important part of the haul cycle.
How the system is built
Most systems have the same few parts:
- Sensors. A small sensor in or on each wheel measures pressure and often temperature. Some are mounted inside the tire on the rim, and others thread onto the valve stem like a cap. External sensors are easier to fit and service. Internal ones are protected from impact but are harder to reach.
- Wireless transmission. The sensor sends its readings by radio, usually at short range, to a receiver on the vehicle. It typically sends data at intervals and more often when something changes.
- Receiver and display. The receiver collects data from every wheel and shows it on a screen in the cab. A display may use color codes or alarms.
- Optional telemetry. Many systems relay data from the vehicle to a central system by cellular or site-wide radio, so a supervisor or maintenance planner can see the whole fleet. This is a typical use of IIoT sensors in heavy equipment.
Sensors run on batteries, so battery life is a maintenance item. Knowing a sensor’s age and condition is part of keeping the system reliable. Signals can also be affected by the metal of large wheels and by distance, so antenna and receiver placement matter, particularly on long vehicles with trailers.
What the alerts mean
Alert levels are usually configurable. A system may flag:
- Low pressure below a set threshold, so the crew can add air or investigate.
- High pressure, which may result from overfilling or from heating.
- High temperature, which may point to brake drag, overloading or too much driving at speed.
- Rapid loss, which suggests a puncture or a leak at the valve or bead.
- Sensor or signal faults, such as low battery or a lost link.
An alert is a prompt to check the tire, not a diagnosis. Operators generally follow the site’s procedures. A warning might call for slowing down or stopping safely, and further checks happen under the supervision of trained staff.
Because pressure rises as tires heat up during operation, a hot tire reads higher than a cold one. The recommended pressures are generally given for a cold tire, which is why many systems account for temperature or alert on trends. Setting a monitoring threshold without considering this can cause either false alarms or missed problems.
Adding air and servicing tires
Inflating and servicing large tires is hazardous work. A tire and wheel assembly stores a great deal of energy, and a failure during inflation or repair can cause serious injury. Large tires are generally serviced only by trained personnel, with proper restraints, equipment and procedures from the tire and wheel maker. Air supply equipment such as portable air compressors must be suited to the pressures and volumes involved. A pressure gauge used for checking should itself be accurate, so regular calibration of gauges is part of a sound tire program. Nitrogen inflation is used by some operators, and its benefits are debated, so site policy and the tire maker’s advice should guide the choice.
Fitting TPMS into a maintenance program
A monitoring system works best as one part of a broader tire program that includes regular visual checks for cuts and damage, routine manual pressure checks, records of pressures and tire life, and training. The data a system gathers can show patterns, like a position on a truck that loses pressure more often, or a haul route that heats tires. Used well, that information supports a predictive maintenance approach by flagging early warning signs of trouble before a failure. It does not replace walk-around inspections, however, and a system is only as dependable as its upkeep.
Limits to keep in mind
Monitoring does not prevent punctures, and it cannot see damage in the tire’s internal structure. Readings may be off if a sensor is damaged or poorly fitted. False alarms can lead to alert fatigue, so thresholds should be tuned carefully. Costs and features differ widely, and some operations rely on manual checks alone. Whether a system pays for itself depends on the tires, the vehicles and the duty, and no single answer fits every site. This article is general information, not engineering advice, and the manufacturer’s instructions and local regulations always come first.