Bendix air dryer cartridge service interval recommendations updated air dryer cartridge service interval recommendations
Click here to read more
As part of the Bendix Tech Tips Series, Bendix offers new guidelines and recommendations for maintenance intervals for its range of air dryer cartridges. These updates reflect the results of extensive field testing and customer input from a variety of vehicle applications, as well as a growing number of replacement options for the aftermarket, the company said.
“The quality of a truck’s compressed air supply is more important than ever,” says Richard Nagel, Bendix Director Marketing and Customer Solutions for Air Charging. âWith a higher degree of automation, there are solenoid valves that enable precise control, but require cleaner air than conventional manual brake valves. Some automated transmissions are also based on pneumatic controls, along with emissions controls and other systems that improve driver safety and comfort. “
Factors that affect the service life of the dryer
The maintenance intervals for the dryer cartridges depend on many factors, including the type, age, and duty cycle of the vehicle’s air compressor, along with the amount of air used and the operating environment of the vehicle. Drivers and fleets should always monitor the air quality in their service tanks to ensure that the air dryers are working properly. If there is excessive moisture – or oil mixed with water – in an air system, the air dryer cartridge may need to be replaced. Nagel suggests always referring to the appropriate service data sheet and pointing out the availability of a new tool, “Recommended Service Intervals for Bendix Air Dryers” (BW8068 on the Bendix online literature library).
Bendix recommends emptying the air reservoir at least every 40,000 km, three months or 900 hours under normal air consumption conditions and checking for moisture in the system; every 12,000 miles, two months, or 450 hours with medium air consumption; and for heavy aircraft every 6,000 miles, a month, or 300 hours.
The replacement intervals also depend on the cartridge type: a standard cartridge in OEM quality, an oil coalescence cartridge and a replacement from the aftermarket have different performance expectations. Bendix’s new service intervals have been developed with its own specific dryers – its standard cartridge; the PuraGuard oil coalescing cartridge; and the Bendix GC Green Cartridge – in the back of your mind. It is always important to Bendix to follow the vehicle manufacturer’s guidelines first, which may vary depending on the requirements of a particular engine or air system.
Recommended service intervals
For easy orientation, Bendix categorizes the vehicle’s air consumption into three general levels: Standard, Medium and High.
PuraGuard cartridges in standard mission situations (five axles or less; long distance; urban; delivery) should be replaced every 24 months or 200,000 miles. PuraGuard medium usage cartridges – pulling double trailers; Light passage; easy terrain; eight axles or less – should be replaced every 18 months or 150,000 miles. And those in applications with high air consumption such as multiple trailers, city driving, heavy off-road applications, and nine or more axles should be replaced every 12 months.
With oil coalescing cartridges, vigilance is especially important as each medium within the component has a specific role: the oil filter does not remove moisture and the desiccant is not designed to remove oil – but both are critical.
“In newer trucks in particular, oil coalescence filters protect components that can cause significant repair costs,” said Nagel. âSo if your truck was originally equipped with an oil coalescing cartridge, it’s important to replace it with one. And you can upgrade from a standard cartridge to an oil coalescing version at any time, even if it doesn’t meet OEM specifications: it’s just an additional level of protection. “
For standard OEM-quality Bendix cartridges without oil coalescence technology, the recommended replacement intervals for standard / medium / high usage are 24, 18 and 12 months, respectively. And in the case of the Bendix GC Green Cartridge, which is designed for older trucks and uses a proprietary blend of new and Bendix recycled desiccant, the recommended replacement intervals are 12 months for normal and medium use and six months for heavy use.
âThe standards are changing,â said Nagel. âOil coalescing technology is the norm on most North American OEM models today, and we’ve had years of cartridge testing, field assessments, and detailed customer usage reports on which to base these recommendations. Customers expect more, and the Bendix team is constantly working to develop product support that helps maximize vehicle performance and safety. “
This tech tip was contributed by Bendix.