Sandvik has introduced a new transmission for its TH663i and TH551i trucks that promises to increase productivity, improve reliability and reduce operating costs.
The upgraded size-class transmission is a result of extensive product development work done by the original equipment manufacturer (OEM) and the transmission supplier to meet customer needs for 61- and 51-tonne machines.
Sandvik TH663i and TH551i trucks with the new transmission are expected to increase productivity and enable shorter cycle times.
According to Sandvik, maximum speed and efficiency in varying ramps and with different loads are achieved with eight gears and optimised axle ratio, compared to previous transmission with six gears.
The fully proportional, more powerful hydraulic retarder operates simultaneously with the engine brake, enabling easier downhill control and higher speeds.
In addition, lock-up to lock-up gear shifting enables quick and smooth shifting and keeps speed better while driving uphill.
Sandvik product line manager trucks Pia Sundberg said the transmission had been extensively tested in Australia, Finland and Ireland in mine conditions.
“We are confident that this solution will significantly improve the truck performance and reliability,” Sundberg said.
“Also, it is great to say that based on the feedback we have received from our field tests with Sandvik TH663i, easy operation and extremely smooth gear shifting really make a difference and improve operator comfort significantly.”
The transmission also improves reliability and reduces costs with a robust and simple design, made specifically for heavy off-road application.
Compared to the previous model, the transmission lifetime is expected to be longer, and less gearbox changeouts are required during the truck lifetime, reducing total costs, according to Sandvik.
From the intelligence point of view, self-diagnostics in the transmission control system has been improved and fully integrated into the Sandvik Intelligent Control System, enabling easy and fast trouble shooting without external diagnostics tools or laptops.