OPERATIONAL PERFORMANCE TEST / Component Test Main Relief Pressure Adjustment Procedure Adjustment: In case of pressure adjustment during power digging operation, adjust the high-pressure side of main relief pressure. In case of pressure adjustment in normal, adjust the low-pressure side of main relief pressure. High-Pressure Side of Main Relief Pressure Ad- justment Procedure 1. Loosen lock nut (1). Lightly tighten plug (3) until plug (3) comes into contact with the end of piston (2). Tighten lock nut (1). Main Relief Valve : 27 mm : Plug (3): 19.5 N m (2 kgf m, 14.5 lbf ft) : Lock Nut (1): 68 to 78 N m (7 to 8 kgf m, 51 to 58 lbf ft) or less 2. Loosen lock nut (4).
Turn plug (5) and adjust pressure until the specified pressure is obtained. T1V1-04-05-001 : 27 mm, 32 mm : Lock Nut (4): 78 to 88 N m (8 to 9 kgf m, 58 to 65 lbf ft) or less T157-05-04-009 Plugs ( 5, 3 ) Pressure Decrease Pressure Increase W107-02-05-127 T4-5-11 3 1 5 4 2 3