320C and 322C Excavators Attachment Hydraulic System – Relief Valve (Line) – Front Lines Illustration 1 g01671873 (1) Torque for the nut … 58.8 ± 5.9 N·m (43 ± 4 lb ft) (2) Torque for the nut … 19.6 ± 2.0 N·m (14 ± 1 lb ft)