Hitachi EX27U Operator's Manual page 155

2. Check electrolyte specific gravity
CAUTION: Battery gas can explode. Keep sparks
and flames away from batteries. Use a flashlight
to check battery electrolyte level.
Do not continue to use or charge the battery
when electrolyte level is lower than specified.
Explosion of the battery may result.
Sulfuric acid in battery electrolyte is poisonous. It
is strong enough to burn skin, eat holes in cloth-
ing, and cause blindness if splashed into eyes.
Never check battery charge by placing a metal
object across the posts. Use a voltmeter or hy-
drometer.
Always remove grounded (–) battery clamp first
and replace it last.
Avoid hazard by:
1. Filling batteries in a well-ventilated area.
2. Wearing eye protection and rubber gloves.
3. Avoiding breathing fumes when electrolyte is
added.
4. Avoiding spilling or dripping electrolyte.
5. Use proper booster batteries start procedure.
If you spill acid on yourself:
1. Flush your skin with water.
2. Apply baking soda or lime to help neutralize
the acid.
3. Flush your eyes with water for 10 to 15 min-
utes. Get medical attention immediately.
(104°F)
(68°F)
Fluid temp.
(32°F)
(–4°F)
(–40°F)
MAINTENANCE
Recommended range of specific gravity by electrolyte temperature
40°C
20°C
0°C
–20°C
–40°C
1.21 1.22
If acid is swallowed:
1. Drink large amounts of water or milk.
2. Then drink milk of magnesia, beaten
eggs, or vegetable oil.
3. Get medical attention immediately.
IMPORTANT: Check the specific gravity of elec-
Check the specific gravity of electrolyte in each bat-
tery cell.
The lowest limit of specific gravity for electrolyte
varies depending on electrolyte temperature. The
specific gravity should be kept within the range
shown below. Charge the battery if the specific grav-
ity is below the limit.
Working range
1.23 1.24 1.25 1.26
Specific gravity of battery fluid
7-51
trolyte after it is cooled to air tem-
perature, not immediately after
operation.
1.27 1.28 1.29 1.30
SA-036
1.31 1.32