Toro Groundsmaster 4000-D Service Manual page 255

Battery Testing
1. Perform a high--discharge test with an adjustable
load tester. This is one of the most reliable means of test-
ing a battery as it simulates the cold--cranking test. A
commercial battery load tester is required to perform
this test.
CAUTION
Follow the manufacturer's instructions when us-
ing a battery load tester.
A. Check the voltage across the battery terminals
prior to testing the battery. If the voltage is less than
12.4 VDC, charge the battery before performing a
load test.
B. If the battery has recently been charged, use a
battery load tester following the manufacturer's in-
structions to apply a 150 Amp load for fifteen (15)
seconds. This step will remove the surface charge.
C. Make sure battery terminals are free of corrosion.
D. Estimate the internal temperature of the battery
to the nearest 10 degrees F.
E. Connect a battery load tester to the battery termi-
nals following the manufacturer's instructions.
Connect a digital multimeter to the battery terminals.
F. Apply a test load of 345 Amps (one half the crank-
ing performance rating of the battery) to the battery
for fifteen (15) seconds.
G. Take a battery voltage reading at fifteen (15) se-
conds, then remove the load.
H. Using the table in the column to the right, deter-
mine the minimum voltage for the battery tempera-
ture reading. If the test voltage is below the minimum
voltage for the battery temperature, replace the bat-
tery. If the test voltage is at or above the minimum,
return the battery to service.
Groundsmaster 4000--D/4010--D
Minimum
Voltage
9.6
9.5
9.4
9.3
9.1
8.9
8.7
8.5
2. If the battery electrolyte is accessible, the specific
gravity of the electrolyte can be used to determine the
battery condition.
IMPORTANT: Make sure the area around the cells is
clean before opening the battery caps.
A. Measure the specific gravity of each cell with a
hydrometer. Draw electrolyte in and out of the
hydrometer barrel prior to taking a reading to warm--
up the hydrometer. At the same time take the tem-
perature of the cell.
B. Temperature correct each cell reading. For each
o o
10 F (5.5 C) above 80
specific gravity reading. For each 10
o
low 80 F (26.7
gravity reading.
Example: Cell Temperature
Cell Gravity
o
100 F minus 80
o
(37.7 C minus 26.7
o
20 F multiply by 0.004/10
o
(11 C multiply by 0.004/5.5
ADD (conversion above)
Correction to 80
C. If the difference between the highest and lowest
cell specific gravity is 0.050 or greater or the lowest
cell specific gravity is less than 1.225, charge the bat-
tery. Charge at the recommended rate and time giv-
en in Charging or until all cells specific gravity is
1.225 or greater with the difference in specific gravity
between the highest and lowest cell less than 0.050.
If these charging conditions can not be met, replace
the battery.
Page 5 - - 65
Battery
Temperature
o o
70 F (and up) 21 C (and up)
o
60 F 16
o
50 F 10
o o
40 F 4
o
30 F --1
o
20 F --7
o
10 F --12
o
0 F --18
o o
F (26.7 C) add 0.004 to the
o
F (5.5
o
C) subtract 0.004 from the specific
o o
F equals 20 F
o o
C equals 11.0 C)
o
F equals 0.008
o
C equals 0.008)
o
o (26.7 C)
F
Electrical System
o
C
o
C
C
o
C
o
C
o
C
o
C
o
C) be-
o
100 F
1.245
0.008
1.253