On 2/26/16 EE was washing the 6-blade. EE bent over to remove the steam cleaner hose from the ripper. As EE stood up EE felt a pull in the lower back. EE did not report incident until 2/28/16 EE did not want medical treatment. On 2/29/16 EE stated back was feeling sore and wanted to be seen. EE was seen at GRMC placed on restrictions. On 3/4/16 EE was taken off work by doc.