Upright AB38, Service & Parts Manual

Page: 34 / 133

Maintenance
Section
4-4 AB38 Work Platform
Temperature Corrected
Electrolyte Temperature Specific Gravity, Fully
Charged
Fahrenheit Celsius USA Euro
120 48.9 1291 1.29
110 43.3 1287 1.29
100 37.8 1283 1.28
90 32.2 1275 1.28
80 26.7 1275 1.28
70 21.1 1275 1.28
60 15.6 1267 1.27
50 10.0 1263 1.26
40 4.4 1259 1.26
30 -1.1 1255 1.26
20 -6.7 1251 1.25
10 -12.2 1247 1.25
5 -15.0 1245 1.25
0 -17.8 1243 1.24
-5 -20.6 1241 1.24
-10 -23.3 1239 1.24
-15 -26.1 1237 1.24
-20 -28.9 1235 1.24
-25 -31.7 1233 1.23
-30 -34.4 1231 1.23
All UpRight battery operated Work Platforms, including
the AB38 can operate at ambient
temperatures to a value of -20ºC (-4ºF). However for
this there are two provisions which must be met.
l
The ISO#46 grade of hydraulic oil normally used in
UpRight Work Platforms must be replaced with a
grade suitable for these low temperature conditions.
l
When ambient temperatures fall below 18ºC
(65ºF) batteries cannot deliver 220 Ampere hours and
so should be placed on charge as soon after use as
possible. Under such conditions a 4 hour equalize
charge once a week in the early afternoon will
improve state of charge and battery life.
Charging
1. Check battery fluid level. If electrolyte level is
lower than 10 mm (3/8 in) above plates add
distilled water only.
2. Connect battery charger lead to properly
earthed outlet of correct voltage and frequency.
3. The Charger will turn on automatically after
going through a self test sequence. LED’s will
indicate the status of charging.
4. The Charger indicates that the charge is
complete when the batteries are fully charged.
BATTERY CELL EQUALIZATION
Specific Gravity is a measurement of the strength of
the electrolyte in a battery and is measured using a
hydrometer. For a fully charged battery the
temperature corrected reading should be about 1.28.
The specific gravity of the electrolyte in the battery
cells should be equalized monthly, or weekly when
used in low temperature conditions. To do this,
charge batteries as described above. After this initial
charge, check the electrolyte level in all cells and add
distilled water as necessary, and turn the charger on
until a full charge is again indicated. During this time,
the charging current will be low (four Amps) as cells
are equalizing.
After equalization, the specific gravity of each cell
should be checked with a hydrometer. The
temperature corrected specific gravity in this state
should be 1.28 . If any corrected readings are below
1.23 , the batteries contain bad cells and therefore the
battery should be replaced.
Do not check the specific gravity in a cell to which
water has just been added. If there is not enough
electrolyte in a fully charged cell to obtain a sample
for the hydrometer, add water and continue charging
for one to two hours before checking again.
4.3 Temperature correction for
Electrolyte readings
SPECIFIC GRAVITY CONVERSION CHART
4.3
Table 4-2: Specific Gravity Conversion
Chart