Kubota WG1605-G-E3 Workshop Manual page 100

WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, 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.
NOTE
• 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 °C (0.0004 with an increase of 1 °F) in temperature, and
increases by 0.0007 with a decreases of 1 °C (0.0004 with a
decrease of 1 °F).
Therefore, using 20 °C (68 °F) as a reference, the specific
gravity reading must be corrected by the following formula:
– Specific gravity at 20 °C = Measured value + 0.0007 ×
(electrolyte temperature - 20 °C)
– Specific gravity at 68 °F = Measured value + 0.0004 ×
(electrolyte temperature - 68 °F)
Gravity of electrolyte
20 °C (68 °F)
1.260
1.240
1.200
1.170
1.120
(a) Good
(b) Bad
1-S22
ENGINE
State of discharging
100
75
50
25
Totally discharged
(c) Bad
9Y1210661ENS0098US0
KiSC issued 01, 2012 A