Toro Groundsmaster 4300-D Service Manual page 321

Inspecting, Maintaining, and Testing the Battery (continued)
Charging the Battery
Groundsmaster ® 4300-D
16226SL Rev C
E. If you charge the battery, apply a 150 A load for 15 seconds to remove
the surface charge. Wait for 10 minutes before proceeding with load test.
F. Apply a test load of 270 A (1/2 the cranking performance rating of the
battery) for 15 seconds.
G. After test load has been applied for 15 seconds, take a test voltage
reading and then remove the load. Record the test voltage reading.
H. Use the Minimum Voltage Table (page
voltage for the center cell electrolyte temperature reading.
Minimum Voltage Table
Minimum Voltage
9.6
9.5
9.4
9.3
9.1
8.9
8.7
8.5
I. If the test voltage is below the minimum, replace the battery. If the test
voltage is at or above the minimum, return the battery to service.
4. After you make the connections, apply terminal protector (Toro Part No.
107-0392) or a light layer of grease on all the battery posts and cable
connectors to reduce corrosion.
To minimize damage to the battery and allow the battery to charge fully, do the
following slow charging procedure. You can do this charging procedure with a
constant current battery charger that is locally available.
Follow the manufacturer's instructions when using a battery charger.
Note: Using specific gravity of the battery cells is the most accurate procedure
of determining the battery condition.
1. Determine the battery charge level from either its specific gravity or open
circuit voltage.
Battery Charge Level
100%
75%
50%
25%
0%
5–97), determine the minimum
Battery-Electrolyte Temperature
70°F (and up)
60°F
50°F
40°F
30°F
20°F
10°F
0°F
IMPORTANT
Specific Gravity
1.265
1.225
1.190
1.155
1.120
Page 5–97
21.1°C (and up)
16°C
10°C
4°C
-1°C
-7°C
-12°C
-18°C
Open Circuit Voltage
12.68
12.45
12.24
12.06
11.89
Electrical System: Service and Repairs