Hitachi ZAXIS 17U-2 Operator's Manual page 148

Electrolyte Level Check
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 level check lines with a wet towel.
Don't use a dry towel. Static electricity maybe
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 it is 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. Check if the
electrolyte surface touches the bottom end of the
sleeve or not according to the right illustrations.
When the electrolyte surface 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. 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 the vicinity around the battery terminals
clean to prevent battery discharge. Check battery
terminals for looseness and rust. Coat terminals with
grease or petroleum jelly to the terminals to prevent
corrosion.
MAINTENANCE
Proper
Lower
7-45
U.L (Upper Level)
L.L (Lower Level)
Filler Port
Sleeve
Separator Top
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.
M146-07-109
Upper Level
Lower Level
M146-07-110
M146-07-111
M146-07-112
M409-07-072