From the official Battlebots guide:

Everything in Jaws of Death, from the clamping jaws to the drive, is hydraulically powered by Char-Lyn J2 hydraulic motors. The motors are fairly heavy, but are small and don't generate much heat.

Powered by 2 Char-Lyn J2 Motors(Each powering 1 jaw), the robot's jaws exert 15 tonnes at the tips!