Komatsu 4D98 Series Shop Manual page 43

3. Inspection and Adjustement
l
Measurement with hydrometer
When using a hydrometer, the measured
specific gravity must be corrected accord-
ing to the temperature at the time of mea-
surement. The specific gravity of battery
electrolyte is defined with 20°C as the
standard. Since the specific gravity in-
creases or decreases by 0.0007 when the
temperature varies by l"C, correct the
value according to the equation below.
D = St + 0.007 (t - 20)
L
1 Electrolyte tempera-
ture at measurement
Specific gravity at mea-
surement
L
-Converted specific gravity at 20%
Specific gravity and remaining battery
charge
I
Specific 1 Discharged 1 Remaining1
1.210
25 75
1.160 50
50
1.110 75
25
1.060 100
0
Terminals
Clean if corroded or soiled.
Mounting bracket
Repair or replace it if corroded.
Retighten if loosened.
Battery appearance
Replace the battery if cracked or de-
formed.
Clean with fresh water if contaminated.
Battery charge meas
with
a hvdrometer
Rubber bulb
Glass tube
Hvdrometer structure
How to read hydrometer
3-12