Commercial drivers must ensure brakes are properly adjusted, with the mark-and-measure method being the most reliable for measuring brake stroke. This involves marking the pushrod, applying the brakes, and measuring the stroke to ensure it doesn’t exceed the chamber’s adjustment limit. Other methods, like measuring free stroke or using parking brakes, are less reliable and may give false readings. Mark-and-measure at full pressure is the best way to ensure proper adjustment.


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Notice: CTT 2025

When coupling a trailer, inspect the area, check trailer ID, inspect the kingpin, ensure 5th wheel lock is open, and chock wheels. Reverse carefully, confirm coupling by tug test, inspect lock engagement, raise landing gear, connect lines, and inspect the trailer. To uncouple, park on level ground, lower landing gear, unlock 5th wheel, disconnect lines, deflate suspension, pull forward, check support, then drive off.

The ZF 12-speed gearbox peripheral parts disassembly involves 11 main tasks, including removing the speed sensor harness, gearbox control device, breather bolt, gear selection and sensor modules, valve body, contact, output shaft speed sensor, odometer sensor, retarder, and PTO. Various tools like torque wrenches, sockets, and special pins are used.

Proper disassembly and assembly of truck gearboxes requires clean conditions, careful sequencing, and attention to alignment. Always follow outside-to-inside principles, handle parts gently, and avoid forcing components. Common issues like gear misalignment or incomplete assembly can be avoided with proper technique. Understand each step—especially for oil pump, auxiliary box, and middle housing—to ensure smooth and safe maintenance.

Discover 10 fascinating truck facts: from the 80m-long French road train to the world's fastest jet-powered truck. Learn how Mercedes got its name, why Arctic vehicles stay unlocked, and why China's a top buyer of seatbelt buckles. The first truck appeared in 1896, and one had wiring over 1800m long. Fun fact: the first driver was a woman! Trucks are complex machines with high recycling value after retirement.

The retarder slows the vehicle by converting kinetic energy into heat via oil flow between a rotor and stator, activated by a handle or brake system. Heat is dissipated through the engine cooling system. For ZF 12-speed gearbox service, use tool XH-10102: adjust its legs via screw, attach to the retarder, then hoist using a gantry hanger.

To quickly install the crankshaft front oil seal, use the special tool:
①Place the oil seal on the guide shaft and align with the pressure plate;
②Fix the tool to the crankshaft and tighten screws with a 12mm socket;
③Turn the center screw to press the seal into place;
④Remove the tool and check the fit. This tool simplifies the process, ensuring accuracy and saving labor.

Leaf springs in truck suspensions provide support, guide wheel movement, and handle directional forces. Compared to air suspensions, they are cost-effective and easy to maintain. However, overloading, high speeds on rough roads, and sharp turns can cause premature damage. Proper load management, safe speeds, and careful driving help extend leaf spring life.

DNT’s gearbox hydraulic trailer simplifies truck gearbox maintenance by using a manual hydraulic pump to lift and lower gearboxes safely and efficiently. It reduces labor intensity, improves repair speed, and ensures safety. Ideal for disassembly and reinstallation, especially in heavy truck repair and engineering applications requiring lifting.

The Auman EST truck is praised for its reliable ZF TraXon automatic transmission, offering smooth shifting, high efficiency, and intelligent driving functions. DNT provides professional ZF 16-speed gearbox repair tools to ensure safe, accurate, and efficient maintenance. Tools like the fork shaft installation aid improve assembly precision, reduce labor, and protect components during repair.

The DNT gearbox hydraulic trailer makes truck gearbox removal and installation safe and easy. Trusted by German experts, it lifts, supports, and repositions gearboxes efficiently during repair or rescue operations.

Cylinder scuffing can severely impact engine performance. Causes include poor break-in, improper clearances, overheating, poor filtration, and injector or cooling failures. DNT engine repair tools help ensure safe, efficient disassembly and reduce secondary damage, offering high performance, ease of use, and great value for professional engine maintenance.

DNT has successfully developed and mass-produced specialized repair tools for ZF 12TX and 16S gearboxes, marking a breakthrough in localized, high-precision tooling. Designed for heavy-duty truck service, the tools meet OEM standards, enhance repair efficiency, and reduce costs—now deployed nationwide and ready for export.

FAST Gearbox Repair Tools are now ready for mass production. Designed for FAST manual and AMT transmissions, they improve efficiency, reduce damage risk, and support standardized repair. Dealer partnership opportunities are now open

Although the structure of ZF gearbox is complex, its service life can reach hundreds of thousands of kilometers as long as the scientific maintenance rhythm is mastered, combined with appropriate maintenance tools and professional intervention. We will continue to pay attention to the new maintenance technology of ZF products and provide professional tools and technical support for the majority of maintenance technicians.