Toro 41188, Service Manual

Page: 169 / 353

Multi Pro 1750
Page 5 − 67
Electrical System
5. If the battery electrolyte is accessible, check the
electrolyte level in each cell. If the level is below the tops
of the plates in any cell, fill all cells with distilled water
between the minimum and maximum fill lines. Charge at
15 to 25 amps for fifteen (15) minutes to allow sufficient
mixing of the electrolyte.
6. Make sure battery cables, battery connections and
the battery hold down components are in good condi-
tion. Also, make sure the battery tray is clean and re-
painted if necessary.
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 ter-
minals 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.
Minimum
Voltage
Battery
Temperature
9.6 70F (and up) 21C (and up)
9.5 60F 16C
9.4 50F 10C
9.3 40F 4C
9.1 30F −1C
8.9 20F −7C
8.7 10F −12C
8.5 0F −18C
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
10F (5.5C) above 80F (26.7C) add 0.004 to the spe-
cific gravity reading. For each 10F (5.5C) below 80F
(26.7C) subtract 0.004 from the specific gravity read-
ing.
Example: Cell Temperature 100F
Cell Gravity 1.245
100F minus 80F equals 20F
(37.7C minus 26.7C equals 11.0C)
20F multiply by 0.004/10F equals 0.008
(11C multiply by 0.004/5.5C equals 0.008)
ADD (conversion above)
0.008
Correction to 80F (26.7C) 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 Battery Charging or until all cells specific
gravity is 1.225 or greater with the difference in spe-
cific gravity between the highest and lowest cell less
than 0.050. If these charging conditions can not be
met, replace the battery.
Electrical
System