EE WAS ATTEMPTING TO REMOVE THE ALCOHOL INJECTOR CANISTER OFF THE COAL SHOVEL. HE HAD SHUT THE AIR PRESSURE OFF AND BLED THE AIR PRESSURE OFF THE SYSTEM. WHILE LOOSENING THE CANISTER, THE RESI DUAL AIR PRESSURE FORCED THE CANISTER DOWN PINCHING HIS FINGER BETWEEN THE CANISTER AND SHOVEL FRAME. HIS FINGER WAS FRACTURED REQUIRING MEDICAL TREATMENT.