Screw Tightening Torque; Insulation Test; No-Load Current Value - Hitachi DH 24PG Repair Manual

Hex. Hd. Tapping Screw D4 (61)<61>{68} ······································ 1.96 ± 0.49 N•m (20 ± 5 kgf•cm)
Tapping Screw (W/Flange) D4 x 16 (77)<74>{84} ····························· 1.96 ± 0.49 N•m (20 ± 5 kgf•cm)
Tapping Screw (W/Flange) D4 x 20 (Black) (82)<82>{92} ··················· 1.96 ± 0.49 N•m (20 ± 5 kgf•cm)
Tapping Screw (W/Flange) D5 x 35 (66)<66>{76} ····························· 2.94 ± 0.49 N•m (30 ± 5 kgf•cm)
Seal Lock Hex. Socket Hd. Bolt M3 x 8 <58> ··································· 2.45 ± 0.50 N•m (25 ± 5 kgf•cm)
Seal Lock Hex. Socket Hd. Bolt M4 x 12 <74> ································· 3.43 ± 0.50 N•m (35 ± 5 kgf•cm)
Seal Lock Hex. Socket Hd. Bolt M5 x 16 [48] ································· 5.88 ± 1.47 N•m (60 ± 15 kgf•cm)
Upon the completion of disassembly and repair, measure the insulation resistance and dielectric strength.
Insulation resistance: 7 M or higher (as measured with a 500 VDC megohm tester)
Dielectric strength: 2500 VAC per minute, with no abnormalities
After no-load operation for 30 minutes, the no-load current values should be as follows:
Voltage (V)
Current (A) max.

Screw tightening torque

Insulation test

No-load current value

110 120
3.0 2.8
127 220
2.6 1.6
-15-
230 240
1.5 1.4