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.
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 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.
B. Temperature correct each cell reading. For each
10
oF (5.5oC) above 80oF (26.7oC) add 0.004 to the
specific gravity reading. For each 10oF (5.5oC) be-
low 80oF (26.7oC) subtract 0.004 from the specific
C. Make surebattery terminals arefreeofcorrosion.
D. Measure the temperature of the center cell.
gravity reading.
Example: Cell Temperature
Cell Gravity
100oF
1.245
oF minus 80oF equals 20oF
oC minus 26.7oC equals 11.0oC)
oF multiply by 0.004/10oF equals 0.008
oC multiply by 0.004/5.5oC equals 0.008)
E. Connect a battery load tester to the battery termi-
nals following the manufacturer’s instructions.
Connect a digital multimeter to the battery terminals.
100
(37.7
20
(11
ADD (conversion above)
Correction to 80oF (26.7oC)
0.008
1.253
F. Apply a test load of 325 amps (one half thecrank-
ing performance rating of the battery) for 15 se-
conds.
C. If the difference between the highest and lowest
cell specific gravity is 0.050 or greater or the lowest
cellspecificgravityislessthan1.225,chargethebat-
tery. Charge at the recommended rate and time giv-
en in Charging or until all cells specific gravity is
G. Take a battery voltage reading at 15 seconds,
then remove the load.
H. Using the table below, determine the minimum
voltage for the cell temperature reading:
1.225
orgreater withthedifferenceinspecificgravity
between the highest and lowest cell less than 0.050.
If these charging conditions can not be met, replace
the battery.
Minimum
Voltage
Battery Electrolyte
Temperature
3.
load tester.
Perform a high--discharge test with an adjustable
9.6
9.5
9.4
9.3
9.1
8.9
8.7
8.5
70oF (and up)
21.1oC (and up)
15.6oC
60oF
50oF
40oF
10.0oC
Thisisoneofthemostreliablemeansoftestingabattery
asitsimulatesthecold--crankingtest.Acommercialbat-
tery load tester is required to perform this test.
4.4oC
30oF
20oF
10oF
0oF
--1.1oC
--6.7oC
CAUTION
--12.2oC
--17.8oC
Follow the manufacturer’s instructions when us-
ing a battery load tester.
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.
Electrical System
Page 5 -- 36
Groundsmaster 4000--D
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Language | English |
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