UPPERSTRUCTURE / Control Valve Bucket W1 Ｊ 1-02-05-053 W2-5-28 Main Relief Valve 19 20 38 21 39 40 41 30 42 Arm Regenerative 43 Valve 31 Overload Relief 44 Valve 19 45 Check Valve-1 2 20 24 46 56 21 47 3 48 4 25 49 57 22 5 26 50 35 6 27 51 34 7 23 28 52 36 9 53 37 33 10 35 54 34 55 11 24 36 8 25 37 12 13 26 14 27 28 15 29 16 17 18 1 Check V 65 66 67 68 Overload Relief Valve Check V alve-2