View 360°. STUMPEX 2-SPEED STUMP GRINDER ATTACHMENT. The Fecon STUMPEX stump grinder mounts to skid steers and backhoes with as little as 20 gpm hydraulic output. The STUMPEX's low RPM and 33,600 ft. per lb. of torque enables it to draw itself down into any species of stump. Low maintenance costs, high production, and less clean-up make the ...