Toro Workman 3000 Series Service Manual page 357

2. Conduct a hydrometer test of the battery electrolyte.
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 temper-
ature of the cell.
B. Temperature correct each cell reading. For each
10_F (5.5_C) above 80_F (26.7_C) add 0.004 to the
specific gravity reading. For each 10_F (5.5_C) be-
low 80_F (26.7_C) subtract 0.004 from the specific
gravity reading.
Example: Cell Temperature
Cell Gravity
100_F minus 80_F equals 20_F
(37.7_C minus 26.7_C equals 11.0_C)
20_F multiply by 0.004/10_F equals 0.008
(11_C multiply by 0.004/5.5_C equals 0.008)
ADD (conversion above)
Correction to 80_F (26.7_C)
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 given
in Charging or until all cells specific gravity is 1.225
or greater with the difference in specific gravity be-
tween the highest and lowest cell less than 0.050. If
these charging conditions can not be met, replace
the battery.
3. Perform a high–discharge test with an adjustable
load tester.
This is one of the most reliable means of testing a battery
as it simulates the cold–cranking test. A commercial bat-
tery load tester is required to perform this test.
Follow the manufacturer's instructions when us-
ing a battery tester.
A. Check the voltage across the battery terminals
prior to testing the battery. If the voltage is less than
12.4 VDC, recharge the battery.
B. If the battery has been charged, apply a 150 amp
load for 15 seconds to remove the surface charge.
Use a battery load tester following the manufactur-
er's instructions.
C. Make sure battery terminals are free of corrosion.
Workman 3000/4000 Series
100_F
1.245
0.008
1.253
CAUTION
Page 8 – 23
D. Measure the temperature of the center cell.
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 one half the Cranking Perfor-
mance (see Battery Specifications) rating of the bat-
tery for 15 seconds.
G. Take a voltage reading at 15 seconds, then re-
move the load.
H. Using the table below, determine the minimum
voltage for the cell temperature reading.
Minimum Battery Electrolyte
Voltage
9.6
70_F (and up)
9.5 60_F
9.4 50_F
9.3 40_F
9.1 30_F
8.9 20_F
8.7 10_F
8.5 0_F
I. If the test voltage is below the minimum, replace
the battery. If the test voltage is at or above the mini-
mum, return the battery to service.
Installation
IMPORTANT: To prevent possible electrical prob-
lems, install only a fully charged battery.
1. Make sure ignition and all accessories are off.
2. Make sure battery compartment is clean and re-
painted if necessary.
3. Make sure all battery cables and connections are in
good condition and battery retainer has been repaired or
replaced.
4. Place battery in its compartment. Make sure battery
is level and flat. Connect positive cable connector onto
positive battery post. Tighten cap screw and lock nut
with two wrenches.
5. Secure battery retainer. Do not overtighten to pre-
vent cracking or distorting the battery case.
Temperature
21.1_C (and up)
15.6_C
10.0_C
4.4_C
–1.1_C
–6.7_C
–12.2_C
–17.8_C
Electrical System (Rev. G)