Heavy truck cab harness tester cab is divided into three parts, namely, the main control box, hand control box and wiring harness connecting portion. Master box section. Main control box inside the main signal processing section, which has a variety of switches, fuses and a lot of relays. They provide power to the heavy truck cab and the necessary power and handle a variety of signals from the heavy truck cab, then returned to the appropriate place to display. Main control box panel has total power indicator, the main power indicator light ctx cab and the steering load, the role of which is when a combination of light load switch open to the left or right turn 225 cab, flasher relay will sense the load of the lamp the amount of current, then turn signal was flashing signal to the signal board, by this way of working, the operator can detect the heavy truck cab steering system is normal. Truck forms, heavy truck cab symmetrical "vibration model" to build up two-dimensional coordinate system / axis positive direction backward axis positive direction 'model of the human body by the driver as a rigid body% + cab + engine + car rack + - Quality co-sprung mass at the front and rear suspension and after a discrete '# a particle composition' vibrational degrees of freedom for the cab + chassis + vertical displacement of the engine and pitch angular displacement + body + front and rear suspension spring Quality and vertical displacement under each carrying a total mass'! Freedom Rigid frame and particle motion to consider the elastic bending vibration to the second stage until the total 'one degree of freedom' input uneven ground displacements entered by the front and rear wheels. grid cabin | Jinan Yiu Cheung (certified) | cab provided by Jinan Yiu Cheung Trading Company. Jinan Yiu Cheung Trading Company (www.jinanyaoxiang.com) Shandong Jinan, engine assembly leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Jinan Yiu Cheung leadership with the staff warmly welcome all inquiries negotiations to create the Jinan Yiu Cheung better future.