Toro Groundsmaster 4500-D Series Service Manual page 355

Battery Testing (continued)
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
H. Using the table in the column to the right, determine the minimum voltage
for the battery temperature reading. If the test voltage is below the
minimum voltage for the battery temperature, replace the battery. If the
test voltage is at or above the minimum, return the battery to service.
Minimum Voltage
9.6
9.5
9.4
9.3
9.1
8.9
8.7
8.5
2. If the battery electrolyte is accessible, the specific gravity of the electrolyte
can be used to determine the battery condition.
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 temperature of
the cell.
B. Temperature correct each cell reading. For each 5.5 ºC (10 ºF) above
26.7 ºC (80 ºF) add 0.004 to the specific gravity reading. For each 5.5
ºC (10 ºF) below 26.7 ºC (80 ºF) subtract 0.004 from the specific gravity
reading.
Example:
Cell Temperature: 100 ºF
Cell Gravity: 1.245
100 ºF minus 80 ºF equals 20 ºF
(37.7 ºC minus 26.7 ºC equals 11.0 ºC)
20 ºF multiply by 0.004/10 ºF equals 0.008
(11 ºC multiply by 0.004/5.5 ºC equals 0.008)
ADD (conversion above): 0.008
Correction to 26.7 ºC (80 ºF): 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 battery. 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 between the highest and lowest cell less than
0.050. If these charging conditions can not be met, replace the battery.
Battery Temperature
70ºF (and up)
60ºF
50ºF
40ºF
30ºF
20ºF
10ºF
0ºF
IMPORTANT
Page 6–73
21ºC (and up)
16ºC
10ºC
4ºC
-1ºC
-7ºC
-12ºC
-18ºC
Electrical System: Service and Repairs