Lubrication Point And Type Of Lubricant; Tightening Torque; Insulation Test; Load Current Value - Hitachi G 12SA4 Service Manual

Lubrication point and type of lubricant

NOTE: Use a brush when rubbing grease.
(1) When replacing the Gear Cover [2]<2>, lubricate the inner circumference of the needle bearing with
0.3 g of Cosmo Molybdenum No. 1 grease.
(2) Rub 18 g of Cosmo Molybdenum No. 1 grease into the pinion chamber of the Gear Cover [2]<2>.
(3) Rub 2 g of Cosmo Molybdenum No. 1 grease into the teeth of the gear.
(4) Rub 0.7 g of Cosmo Molybdenum No. 1 grease into the teeth of the pinion.
Item No.
[18]<18> Special Nut M7
[7]<7> Seal Lock Screw (W/Sp. Washer) M4 x 14
[39]<39> Tapping Screw D3 x 8
[46]<46> Tapping Screw (W/Flange) D4 x 12
[51]<51> Tapping Screw (W/Flange) D4 x 20 (Black)
Measure the insulation resistance and dielectric strength after reassembly.
• Insulation resistance: 7 MΩ or higher (as measured with a 500 VDC megohm tester)
• Dielectric strength: 4,000 VAC/minute, with no abnormalities -------------- 230 V to 240 V
2,500 VAC/minute, with no abnormalities -------------- 120 V
After no-load operation for 30 minutes, the no-load current values should be as follows.
Voltage
Current max.

Tightening torque

Part name

Insulation test

No-load current value
120 V
5.0 A
-6-
Tightening torque
N•m lbf•ft
7.4 ± 0.5 5.5 ± 0.4
1.8 ± 0.4 1.3 ± 0.3
0.74 0.54
0
-
0.25
2.0 ± 0.5 1.5 ± 0.4
2.0 ± 0.5 1.5 ± 0.4
230 V
2.5 A
kgf•cm
75 ± 5
18 ± 4
7.5 0
0
-
-
2.5
0.18
20 ± 5
20 ± 5
240 V
2.5 A