Kubota D1503-M-DI Workshop Manual page 51

03-M-DI Series, 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)
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 °C (68 °F)
Directions for Storage
1. When shutting down the tractor for long periods of time, remove
the battery from the tractor, adjust the electrolyte to the proper
level, and after fully charging, store the battery in a well ventilated
placed where it is not exposed to direct sunlight.
2. Since the battery self-discharges by approx. 0.5 % per day even
in storage, it must be once every two months in cold season.
3. When storaging the battery mounted on the tractor, disconnect
the ground cable from the battery's negative terminal post.
Self-discharge Rate
Temperature
30 °C (86 °F)
20 °C (68 °F)
10 °C (50 °F)
S-30
DIESEL ENGINE
State of Charge
100 % Charged
75 % Charged
50 % Charged
25 % Charged
Very Little Useful Capacity
Discharged
Self-discharge rate
Approx. 1.0 % per day
Approx. 0.5 % per day
Approx. 0.25 % per day
W1012763
W1053636
KiSC issued 10, 2009 A