EE CLAIMS THAT HE FELT A SHARP PAIN IN THE GROIN WHILE HE WAS HELPING TO LIFT A DUAL WHEEL ASSEMBLY. THE INJURED EE AND CO-WORKER WERE IN THE PROCESS OF RE-INSTALLING WHEEL ASSEMBLY ON A SLURR Y TANKER AFTER THEY HAD REPLACED A BEARING WHEN THE INJURY OCCURRED. THE 2 EE'S WERE TRYING TO MANUALLY RAISE THE WHEEL ASSEMBLY WHICH WEIGHED APPROX. 200 LBS.