EE OPERATING F/E LOADER TO CLEAN OUT MATERIALS ON RAMP, EE PUSHED DECLUTCH INSTEAD OF BRAKE JOLTED HIMSELF CAUSING BACK PAIN. TAKEN TO CLINIC 8-1-01 800 AM OBSERVATION ONLY. FOLLOW UP VISIT 8- 6-01-CLINIC ORDERED PHYS. THERAPY WITH LIGHT DUTY RESTRICTIONS. PS OPERATOR WAS WEARING SEAT BELT.