SECTION 2 STRUCTURE AND FUNCTION SECTION 2 STRUCTURE AND FUNCTION GROUP 1 HYDRAULIC PUMP GROUP 1 HYDRAULIC PUMP 1. STRUCTURE (1/2) 1. STRUCTURE (1/2) 1 Main pump 2 Control valve 3 Control valve 30 Locking screw 40 Stop screw 41 Nut 42 Cap 43 O-ring 72 Cover 73 Cover 75 Screw 76 Screw 2-1