Hitachi NT65MA3 Instruction Manual - Page 21

Air leakage point (C) Blade guide (D) Air outlet, valve bushing Possible cause With control valve OFF With control valve ON The Cylinder O-Ring (I.D 63.1) [12] is abnormal (broken or damaged). The seal surface of the Body Ass'y [30] is abnormal ( c portion). The Piston Bumper [25] is abnormal ( d or e portion is damaged, deformed or cracked). The Piston [15] is abnormal (driver blade or sealed face is deformed). The e surface of the Body Ass'y [30] is deformed. The Valve Packing [16] is damaged. The O-Ring (1AP-3) [19] of the Plunger [18] is abnormal (worn, broken or damaged). The O-Ring (S3) [20] of the Plunger [18] is abnormal (worn, broken or damaged). The screw of the Valve Bushing [22] is loose. (E) Control valve (1) (F) Control valve (2) (G) Cap (A) The O-Ring (I.D 11) [66] on Valve Piston (B) [65] is abnormal (worn, broken or damaged). The lower O-ring (I.D 8.8) [63] on Valve Piston (B) [65] is abnormal (worn, broken or damaged). The O-Ring (S-18) [62] on Valve Bushing (B) [61] is abnormal (broken or damaged). The inside surface of the valve chamber of the Body Ass'y [30] is abnormal. The upper O-Ring (I.D 8.8) [63] on Valve Piston (B) [65] is abnormal (worn, broken or damaged). The Head Valve O-Ring (I.D 16.8) [60] on Valve Bushing (B) [61] is abnormal (broken or damaged). * The Top surface of the valve chamber of the Body Ass'y [30] is abnormal ( f portion). The O-ring (I.D 1.8) [69] on Plunger (A) [68] is abnormal (worn, broken or damaged). Valve Bushing (A) [70] is abnormal (sliding surface of Plunger (A) [68] is deformed or scratched). The inside of the O-ring (S-4) [64] on Valve Piston (B) [65] is abnormal (worn, broken or damaged). Plunger (A) [68] is abnormal (sliding surface is deformed or scratched). Gasket (B) [48] is damaged. The Hex. Socket Hd. Bolt M5 x 16 [50] is loose. The seal surface of the Body Ass'y [30] or Cap (A) [49] is abnormal (broken, deformed or scratched). --- 18 ---