Class-Top Overload Durability; Wear Resistance Of Armature Coil; Vibration-Absorbing Side Handle - Hitachi G 12SA3 Technical Data And Service Manual

4-1. Class-top Overload Durability

The Models G 12SA3 and G 13SB3 provide class-top overload durability thanks to an improved cooling
mechanism and a high-power motor.
Practical test data: Comparison of torque when the stator coil temperature rise is 200û K
G12SA3
G13SB3
G12SA2
G13SB2

4-2. Wear Resistance of Armature Coil

Fan side of the armature coil is sealed with protect tape and wedges at commutator side of the armature coil are
extended by 4 to 5.5 mm to minimize wear of the armature coil caused by dust.
The service life of the armature coil is 2 times longer than the conventional models as a result of the gravel
suction test (gravel is forcibly sucked through the vents of the tail cover).
Protect tape winding

4-3. Vibration-absorbing Side Handle

Vibration-absorbing side handle for vibration reduction: Vibration to side handle is reduced to 35 %.
Vibration-absorbing side handle
H
B
0
G 13SB3
80
64
50 100
Fig. 1
4 mm to 5.5 mm
Wedge
Fig. 2
Reduced to 35%
Fig. 3
--- 2 ---
106
100
Normal side handle
G 13SB3