Using A Hydrometer - E-Z-GO MPT 800 Bedienungs- Und Wartungshandbuch

OPERATION AND SERVICE INFORMATION
Read all of Manual to become thoroughly familiar with this vehicle. Pay particular attention to all Notes, Cautions and Warnings
Bulb
Cylinder
32
28
Add to Float
24
20
Reading
16
12
8
4
0
4
8
12
16
20
Subtract
24
from Float
28
Reading
32
36
Thermometer
Ref Hyd 1
Fig. 32 Hydrometer

Using a Hydrometer

1. Draw electrolyte into the hydrometer several times to
permit the thermometer to adjust to the electrolyte
temperature and note the reading. Examine the color
of the electrolyte. A brown or gray coloration indicates
a problem with the battery and is a sign that the bat-
tery is nearing the end of its life.
2. Draw the minimum quantity of electrolyte into the
hydrometer to permit the float to float freely without
contacting the top or bottom of the cylinder.
3. Hold the hydrometer in a vertical position at eye level
and note the reading where the electrolyte meets the
scale on the float.
4. Add or subtract four points (.004) to the reading for
every 10° F (6°C) the electrolyte temperature is
above or below 80° F (27° C). Adjust the reading to
conform with the electrolyte temperature, e.g., if the
reading indicates a specific gravity of 1.250 and the
electrolyte temperature is 90° F (32° C), add four
points (.004) to the 1.250 which gives a corrected
Page 26
Float
1100
1125
1150
1175
1200
1225
1250
1275
1300
1100
1125
1150
1200
1225
1250
1275
1300
32
28
24
20
16
12
8
4
0
4 4
8
12 12
16 16
20 20
24 24
28 28
32 32
36 36
Weight
Owner's Manual and Service Guide
reading of 1.254. Similarly if the temperature was
70° F (21° C), subtract four points (.004) from the
1.250 to give a corrected reading of 1.246 (Ref Fig.
33 on page 26).
5. Test each cell and note the readings (corrected to
80° F or 27° C). A variation of fifty points between any
two cell readings (example 1.250 - 1.200) indicates a
problem with the low reading cell(s).
As a battery ages the specific gravity of the electrolyte
will decrease at full charge. This is not a reason to
replace the battery, providing all cells are within fifty
points of each other.
Since the hydrometer test is in response to a vehicle
exhibiting a performance problem, the vehicle should be
recharged and the test repeated. If the results indicate a
weak cell, the battery or batteries should be removed
and replaced with a good battery of the same brand, type
and approximate age.
Electrolyte
Temperature
° F ° C
160 71.1
150 65.6
140 60.0
130 54.4
120 48,9
110 43.3
100 37.8
90 32.2
80 26.7
70 21.1
60 15.6
50 10
40 4.4
30 –1.1
20 –6.7
10 –12.12
Fig. 33 Hydrometer Temperature Correction
+.032
+.030
+.028
+.026
+.024
EXAMPLE #1:
+.022
Electrolyte Temperature
+.020
Above 80°F (27°C)
+.018
+.016
Electrolyte temperature
+.014
90° F (32° C)
+.012
Hydrometer reading 1.250
+.010
1.250 + .004 = 1.254
+.008
corrected specific gravity
+.006
+.004
+.002
0
–.002
–.004
–.006
EXAMPLE #2:
–.008
Electrolyte Temperature
–.010
Below 80°F (27 °C)
–.012
–.014
Electrolyte temperature
–.016
70° F (21° C)
–.018
Hydrometer reading 1.250
–.020
1.250 - .004 = 1.246
–.022
corrected specific gravity
–.024
–.026
–.028