2.
Conductahydrometer testofthebatteryelectrolyte.
A. Check the voltage across the battery terminals
prior to testing the battery. If the voltage is less than
IMPORTANT: Make sure the area around the cells is
clean before opening the battery caps.
12.0
VDC, recharge the battery.
B. Ifthebatteryhasbeencharged, applya150amp
load for 15 seconds to remove the surface charge.
Use a battery load tester following the manufactur-
er’s instructions.
A. Measure the specific gravity of each cell with a
hydrometer. Draw electrolyte in and out of the
hydrometer barrel prior totaking areading towarm--
up the hydrometer. At the same time take the tem-
perature of the cell.
C. Makesurethebatteryterminals arefreeofcorro-
sion.
B. Temperature correct each cell reading. For each
10
o F (5.5o C) above 80_F (26.7o C) add 0.004 to
D. Measure the temperature of the center cell.
the specific gravity reading. For each 10o F (5.5o C)
below 80o F (26.7o C) subtract 0.004 from the spe-
E. Connect a battery load tester to the battery ter-
minals following the manufacturer’s instruc-
tions. Connect a digital multimeter to the battery
terminals.
cific gravity reading.
Example:
Cell Temperature 100o F
Cell Gravity
ADD (20o above 80o F)
Correction to 80o F
1.245
0.008
1.253
F. Apply a test load of one half the Cranking Perfor-
mance rating (see Fig. 17) 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
cell specific gravity is less than 1.225, charge the
battery. Charge at the recommended rate and time
given in Charging or until all cells specific gravity is
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.
1.225
or greater with the difference in specific grav-
ity between the highest and lowest cell less than
If these charging conditions can not be met,
0.050.
Minimum
Voltage
Battery Electrolyte
Temperature
replace the battery.
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
70o F (and up)
60o F
21.1o C (and up)
15.6o C
10.0o C
4.4o C
50o F
40o F
Thisisoneofthemostreliablemeansoftestingabattery
asitsimulatesthecold--crankingtest.Acommercialbat-
tery load tester is required to perform this test.
30o F
20o F
10o F
0o F
--1.1o C
--6.7o C
--12.2o C
--17.8o C
CAUTION
Follow the manufacturer’s instructions when
using a battery 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 (S/N 30101 & Up) (Rev. E)
Page 8 -- 16
Groundsmaster 580--D
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| Document Type | Service Manual |
| Language | English |
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