Lubrication Points And Types Of Lubricant; Tightening Torque; Insulation Tests - Hitachi G 12VA Technical Data And Service Manual

Lubrication points and types of lubricant

Pinion chamber of the Gear Cover Ass'y [4] <5> -------COSMO MOLYBDEN No. 2 grease 22 g
Needle bearing -------------------------------------------------- Mixed oil 0.5 cc
Tapping Screws D4 [13] <14> [55] <56> [59] <60> ------- 2.0
Seal Lock Screws (W/Sp. Washer) M4 x 10 [1] <3> ------ 1.8
Tapping Screw D5 x 25 [2] <1>--------------------------------- 2.9
Seal Lock Screw (W/Sp. Washer) M4 x 8 [21] <22> ------ 2.9
Seal Lock Screw (W/Sp. Washer) M5 x 16 [26] <27>----- 3.4
Tapping Screw D3 x 10 [44] <45>------------------------------ 0.74
Magnet [18] <19> (M6 left-hand thread)---------------------- 1.27
Nut M8 [5] ----------------------------------------------------------- 13.7
Spacial Nut M6 <6> ----------------------------------------------- 5.1
Upon completing disassembly and repair, measure the insulation resistance and conduct a dielectric
strength test.
Insulation resistance: 10M or more using a DC 500 V megohm tester
Dielectric strength test: 4,400 VAC/3 sec., with no abnormalities ------------ More than 150 V of rated voltage
After no-load operation for 30 minutes, the no-load current values should be as follows.
Voltage (V)
Current (A) max.

Tightening torque

Insulation tests

3,000 VAC/3 sec., with no abnormalities ------------ Less than 150 V of rated voltage
No-load current value
110 120
4.9 4.8
Generously rub grease onto the gear and the pinion.
Mixed oil: Mixture of Hitachi power tool grease No. 2
(Unilube No. 00) and turbine oil
Mixed ratio1:1 (weight ratio)
0.5 N m (20 5 kgf
•
0.4 N m (18
•
0.5 N m (30
•
0.5 N m (30
•
0.7 N m (35
•
0.15 N m (7.5
•
0.29 N m (13
•
2.0 N m (140
•
1.0 N m (50
•
127
4.7
-16-
cm, 1.5 0.4 ft-lbs.)
•
4 kgf cm, 1.3 0.3 ft-lbs.)
•
5 kgf cm, 2.2 0.4 ft-lbs.)
•
5 kgf cm, 2.2 0.4 ft-lbs.)
•
7 kgf•cm, 2.5 0.5 ft-lbs.)
1.5 kgf cm, 0.5 0.1 ft-lbs.)
•
3 kgf cm, 0.9 0.2 ft-lbs.)
•
20 kgf•cm, 10.1 1.5 ft-lbs.)
10 kgf cm, 3.6 0.7 ft-lbs.)
•
230 240
2.4 2.4