Toro Groundsmaster 7210 Service Manual page 259

Inspecting, Maintaining, and Testing the Battery (continued)
Groundsmaster 7210
16222SL Rev C
B. Temperature correct each cell reading. For each 5.5°C (10°F) above
26.7°C (80°F) add 0.004 to the specific gravity reading. For each 5.5°C
(10°F) below 26.7°C (80°F) subtract 0.004 from the specific gravity
reading; refer to the
Cell Specific Gravity Example
Cell Temperature
Cell Specific Gravity
37.7°C minus 26.7°C equals 11.0°C
(100°F minus 80°F equals 20°F)
11°C multiply by 0.004/5.5°C equals 0.008
(20°F multiply by 0.004/10°F equals 0.008)
ADD (conversion above)
Correction to 26.7°C (80°F)
C. If the difference between the highest and lowest cell specific gravity is
0.050 or more or the lowest cell specific gravity is less than 1.225, charge
the battery.
D. Charge at the rate and time given in
or until all cells specific gravity is 1.225 or greater with the difference in
specific gravity between the highest and lowest cell is less than 0.050. If
you can not meet these charging conditions, replace the battery.
3. Do a high-discharge test with an adjustable load tester. This is 1 of the most
reliable means of testing a battery as it simulates the cold-cranking test. A
commercial battery load tester is required to do this test.
Follow the manufacturer's instructions when using a battery load
tester.
A. Check the voltage across the battery terminals before testing the battery.
If the voltage is less than 12.4 VDC, charge the battery before continuing
the test.
B. If you charge the battery, apply a 150 A load for 15 seconds to remove
the surface charge. Use a battery load tester following the manufacturer's
instructions.
C. Ensure that the battery terminals are free of corrosion.
D. Measure the electrolyte temperature of the center cell.
E. Connect a battery load tester to the battery terminals following the
manufacturer's instructions. Connect a digital multimeter to the battery
terminals
F. Apply a test load of 1/2 the cranking performance rating of the battery for
15 seconds; refer to
G. Take a test voltage reading at 15 seconds, then remove the load.
Cell Specific Gravity Example (page
100°F
1.245
0.008
1.253
Charging the Battery (page 5–65)
CAUTION
Battery Specifications (page
Page 5–63
5–63).
5–61).
Electrical System: Service and Repairs