Transmission Upgrade For Sandvik TH551i and Sandvik TH663i

• Robust and more simple design with less components (integrated PTO for hydraulic pumps and drop box).
• Lower operating costs with longer transmission lifetime due to robust design specifically made for heavy off-road application.
• Increased lock-up clutch lifetime with reduced lock-up activations.
• Heavy duty aluminium coolers. Improved cooling performance. Increased resistance to corrosion. Easier to clean. Lower cost to replace in case of damages.
• Improved self diagnostics integrated on truck’s control system. Easy and fast trouble shooting.
• Engine brake and fully proportional, more powerful hydraulic retarder which operate simultaneously. Makes easier downhill control and higher speeds enabling shorter cycle times.
• Maximum speed and efficiency in varying ramps and with different loads. Achieved with eight gears and optimized axle ratio, compared to original transmission with six gears).
• Lock-up to lock-up gear shifting. Quick and smooth gear shifting that allows to keep speed better in uphill gear shifting.
• Easy operation and extremely smooth gear shifting improve operator comfort.

• Increase reliability and reduce operating cost.
• Increase productivity.
• Increase operator comfort.


To increase productivity, improve reliability and reduce truck operating costs, Sandvik has introduced a new transmission for its flag ship trucks Sandvik TH551i and Sandvik TH663i. The new size-class transmission is a result of extensive product development work done by Sandvik and the transmission supplier to meet the cus-tomer needs for 51 and 63 tonnes trucks.

In the new transmission, improved reliability and reduced costs are achieved with 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 change-outs are required during the truck lifetime, reducing total costs.

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.

The driveline design has been also improved as a the original two-piece rear driveline shaft is replaced with a one-piece driveline shaft. This more robust driveline shaft extends the driveline lifetime, eases maintenance and eliminates the need for the rear driveline support bearing.

The Upgrade solution can include also a new durable and maintenance friendly aluminium cooler with outstand-ing corrosion resistance and long component lifetimes (option).

Front and rear axles replacement is mandatory in down-hill loaded applications.


-Transmission complete assembly incl. pumps, hosing, brackets, etc.
-Rear drive shaft
-Complete air intake assembly
-Hydraulic assembly
-Electric assembly
-Brackets and screws set
-Option: Complete new cooling system, incl. coolers, hoses, mask, etc.
-Option (in case of downhill application): Front and rear axles assemblies

Application area

Lifecycle cost improvement


Sandvik TH551i, Sandvik TH663i