Hitachi ZAXIS 30U-5N Operator's Manual page 254

Electrolyte Level Check
--- every month
1. Check the electrolyte level at least once a month.
2. Park the machine on level ground and stop the engine.
3. Check the electrolyte level.
3.1 When checking the level from the battery side:
Clean around the level check lines with a wet towel.
Do not use a dry towel. Static electricity may be
developed, causing the battery gas to explode. Check
if the electrolyte level is between U.L (Upper Level)
and L.L (Lower Level). In case the electrolyte level
is lower than the middle level between the U.L and
L.L, immediately refill distilled water or commercial
battery fluid. Be sure to refill with distilled water before
recharging (operating the machine). After refilling,
securely tighten the filler plug.
3.2 When impossible to check the level from the battery
side or no level check mark is indicated on the side:
After removing the filler plug from the top of the
battery. Check the electrolyte level by viewing through
the filler port. It is difficult to judge the accurate
electrolyte level in this case. Therefore, when the
electrolyte level is flush with the U.L, the level is judged
to be proper. Then, referring to the right illustrations,
check the level. When the electrolyte level is lower than
the bottom end of the sleeve, refill with distilled water
or commercial battery fluid up to the bottom end of
the sleeve. Be sure to refill with distilled water before
recharging (operating the machine). After refilling,
securely tighten the filler plug.
3.3 When an indicator is available to check the level, follow
its check result.
4. Always keep around the battery terminals clean to
prevent battery discharge. Check terminals for loose
and/or rust. Coat terminals with grease or petroleum
jelly to prevent corrosion build up.
MAINTENANCE
Separator Top
Proper
Lower
7-74
Filler Port
Sleeve
Since the electrolyte surface touches the bottom end of
the sleeve, the electrolyte surface is raised due to surface
tension so that the electrode ends are seen curved.
When the electrolyte surface is lower than the bottom
end of the sleeve, the electrode ends are seen straight.
U.L (Upper Level)
L.L (Lower Level)
M146-07-109
Upper Level
Lower Level
M146-07-110
M146-07-111
M146-07-112
M409-07-072