Service Manual

Page 5 – 16
Electrical System
Sand Pro & Infield Pro 3040/5040
Testing
1. To properly test a battery, perform a high–discharge
test using 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 battery load tester
is required to perform this test.
CAUTION
Follow the manufacturer’s instructions when us-
ing a battery load tester or a battery charger.
A. Check the voltage across the battery terminals
prior to testing the battery. If the battery voltage is
less than 12.4 VDC, charge the battery.
B. If the battery has recently been charged, remove
the battery surface charge before performing the
load test. Disconnect and ground the engine spark
plug wires to prevent the engine from starting. En-
gage the starter motor for 10 seconds to remove bat-
tery surface charge. Reconnect the spark plug wires.
C. Make sure battery terminals are free of corrosion.
D. Measure the battery electrolyte temperature of
the center cell.
E. Connect a battery load tester to the battery termi-
nals following the load tester manufacturer’s in-
structions. Connect a digital multimeter to the
battery terminals.
F. Using the battery load tester, apply a test load of
150 amps (one half the CCA rating of the battery) for
15 seconds. Note the battery voltage reading at 15
seconds, then remove the load.
G. Using the table below, determine the minimum
voltage for the electrolyte temperature reading:
Minimum
Voltage
Battery Electrolyte
Temperature
9.6 70
o
F (and up) 21
o
C (and up)
9.5 60
o
F 16
o
C
9.4 50
o
F 10
o
C
9.3 40
o
F 4
o
C
9.1 30
o
F –1
o
C
8.9 20
o
F –6
o
C
8.7 10
o
F –12
o
C
8.5 0
o
F –17
o
C
H. If the test voltage is below the minimum voltage,
charge the battery and perform load test again. If test
voltage still is below minimum voltage, replace the
battery. If the test voltage is at or above the minimum
voltage, return the battery to service.
2. If a battery load tester is not available, the battery can
be tested by conducting 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 tem-
perature of the cell.
B. Temperature correct each cell reading. For each
10
o
F (5.5
o
C) above 80
o
F (26.7
o
C), add 0.004 to the
specific gravity reading. For each 10
o
F (5.5
o
C) be-
low 80
o
F (26.7
o
C), subtract 0.004 from the specific
gravity reading.
Example: Cell Temperature 100
o
F
Cell Gravity 1.245
100
o
F minus 80
o
F equals 20
o
F
(37.7
o
C minus 26.7
o
C equals 11.0
o
C)
20
o
F multiply by 0.004/10
o
F equals 0.008
(11
o
C multiply by 0.004/5.5
o
C equals 0.008)
ADD (conversion above) 0.008
Correction to 80
o
F (26.7
o
C) 1.253
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 the specific gravity of all cells
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.