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Identification of Causes of Transmission Damage

Identification of Causes of Transmission Damage-Machinery & Equipment-CAS Testing Technical Services (Hong Kong) Company Limited

Causes of gearbox damageAppraisal Background

Gearbox damage cause identification is a process of professional assessment of faults in automobile gearboxes to determine the nature, cause and extent of the fault. As the core component of the automobile's transmission system, the gearbox may cause problems such as shifting shock, slipping, abnormal noise, oil leakage, and stalling when entering gear. The identification process may include inspection of transmission oil quality, testing of shifting performance, disassembly and inspection of internal parts, etc., to determine whether the failure is caused by human factors such as gear damage, clutch wear, oil line blockage, oil pump failure, electronic control system problems, or improper operation.
In the case of gearbox damage cause identification, Zhongke Testing can provide gearbox damage cause identification services.

Causes of gearbox damageAccreditation criteria

GB/T 25765-2010 Rolling bearings Ball bearings for automotive transmissions
GB/T 25764-2010 Rolling bearings Roller bearings for automotive transmissions
GB/T 25763-2010 Rolling bearings Needle roller bearings for automotive transmissions
GB/T 41607-2022 Test method for inertia absorption durability of friction elements of wet automatic transmission
GB/T 33540.3-2017 Special lubricants for wind turbines Part 3: Transmission gear oil
GB/T 35472-2017 Test method for friction elements of wet automatic transmission
GB/T 38074-2019 Determination of friction and wear properties of manual transmission lubricants SRV testing machine method

Causes of gearbox damageAuthentication case

One day, the insurance company received a notice from customer Luo that his car collided with someone on the national highway, causing serious damage. The right side of the vehicle was damaged and the gearbox was severely squeezed. Therefore, the insurance company sent relevant investigators to conduct an investigation and found that the collision was not serious and should not have caused such serious damage to the gearbox. Therefore, the insurance company commissioned an appraisal agency to conduct an investigation to determine the cause of the gearbox damage.
was entrusted by the insurance company to conduct an appraisal and analysis of the "cause of damage" to the gearbox involved.
identification and analysis results: The
identification and analysis expert team inspected and analyzed the accident vehicle and made the following suggestions and conclusions:
The dented deformation mark on the side of the fixing screw on the right side of the gearbox is inconsistent with the force direction of the vehicle collision and is not consistent with the characteristics of a collision on the right side of the vehicle.
At the same time, the connection position between the right half shaft and the gearbox is not loose, which is inconsistent with the signs of damage to the mounting screw holes of the gearbox housing and the right front half shaft.
It can be seen from this that the signs of damage to the vehicle's gearbox do not match the signs of the collision. There is reason to believe that the collision was not the cause of the damage to the gearbox.

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