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6. Oil Pressure Switch
Structure
This oil pressure switch is used to warn engine oil pressure. When the pressure increases more than specified, the oil
pressure lamp lights up warning the trouble, Diaphragm and contact points are combined in the oil pressure switch.
a. Oil pressure switch lamp lights up at pressure less than 0.2 – 0.4 kgf/cm
2
.
7. Battery
1) Specifications
Model
CM284
75D26L
Electrolyte specific gravity
(at 20ºC)
1.28/When charged fully
CM364
Capacity 75 AH Charging current 7A When charged normally
2) Specific gravity of electrolyte and charging condition
The specific gravity of electrolyte decreases approximately
lineally in proportion to the discharged electricity of
battery. By measuring the specific gravity of the electrolyte
using a hydrometer, residual capacity of the battery can be
known.
The specific gravity value measured by the hydrometer
should be compensated with respect to temperature. The
specific gravity of battery electrolyte is based on the
temperature of 20°C. As the temperature varies 1°C, the
specific gravity value increases or decreases 0.0007.
Therefore measured values can be compensated by the
following equation.
S20 = St + 0.0007 (t – 20)
The right figure shows how to read the hydrometer and the
table indicates relation between the specific gravity values
and battery residual capacity.
133X
Specific gravity
(20°C)
Discharged
electricity (%)
Residual capacity
(%)
1.280 0 100
1.225 25 75
1.170 50 50
1.116 75 25
1.060 100 0
Specific gravity converted to
the value at 20°C
Measured specific gravity
Electrolyte temperature in
measured value
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