Using A Hydrometer - Cushman 29175-G01 Owner's Manual And Service Manual

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
Fig. 29 Hydrometer
thermometer that will measure the temperature of the
electrolyte and will include a conversion scale to correct
the float reading. It is important to recognize that the
electrolyte temperature is significantly different from the
ambient temperature if the vehicle has been operated.

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
ELECTRIC THREE WHEEL SERVICE VEHICLE
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
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
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. 30 on
page 23).
Electrolyte
Temperature
˚ F ˚ C
160 71 +.032
+.030
150 66 +.028
+.026
140 60 +.024
+.022
130 54 +.020
+.018
120 49 +.016
+.014
110 43 +.012
+.010
100 38 +.008
+.006
90 32 +.004
+.002
80 27 0
–.002
70 21 –.004
–.006
60 16 –.008
–.010
50 10 –.012
–.014
40 4 –.016
–.018
30 –1 –.020
–.022
2 –7 –.024
–.026
10 –12 –.028
Fig. 30 Hydrometer Temperature Correction
Electrolyte Temperature
Above 80˚ F (27˚ C)
Electrolyte temperature
90˚ F (32˚ C)
Hydrometer reading 1.250
1.250 + .004 = 1.254
corrected specific gravity
EXAMPLE #1:
EXAMPLE #2:
Electrolyte Temperature
Below 80˚ F (27˚ C)
Electrolyte temperature
70˚ F (21˚ C)
Hydrometer reading 1.250
1.250 - .004 = 1.246
corrected specific gravity
Page 23