Kubota WSM OC60-E2 Workshop Manual page 71

OC60-E2, OC95-E2, WSM
Battery Specific Gravity
1. Check the specific gravity of the electrolyte in each cell with a
hydrometer.
2. When the electrolyte temperature differs from that at which the
hydrometer was calibrated, correct the specific gravity reading
following the formula mentioned in (Reference).
3. If the specific gravity is less than 1.215 (after it is corrected for
temperature), charge or replace the battery.
4. If the specific gravity differs between any two cells by more
than 0.05, replace the battery.
Hold the hydrometer tube vertical without removing it
from the electrolyte.
Do not suck too much electrolyte into the tube.
Allow the float to move freely and hold the hydrometer at
eye level.
The hydrometer reading must be taken at the highest
electrolyte level.
(Reference)
Specific gravity slightly varies with temperature. To be exact,
the specific gravity decreases by 0.0007 with an increase of
1 (0.0004 with an increase of 1
increases by 0.0007 with a decreases of 1
decrease of 1 ).
Therefore, using 20
gravity reading must be corrected by the following formula :
-Specific gravity at 20
(electrolyte temperature - 20
-Specific gravity at 68
(electrolyte temperature - 68
Specific Gravity
1.260 Sp. Gr.
1.230 Sp. Gr.
1.200 Sp. Gr.
1.170 Sp. Gr.
1.140 Sp. Gr.
1.110 Sp. Gr.
At an electrolyte temperature of 20
(a) Good
(b) Bad
S-19
) in temperature, and
(0.0004 with a
(68 ) as a reference, the specific
= Measured value + 0.0007 x
)
= Measured value + 0.0004 x
)
State of Charge
100 % Charged
75 % Charged
50 % Charged
25 % Charged
Very Little Useful Capacity
Discharged
(68 )
(c) Bad
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ENGINE