Hitachi Zaxis 17U-5A Operator's Manual page 210

Check Electrolyte Level --- every one month
1. Check the electrolyte level at least once a month.
2. Park the machine on level ground and stop the engine.
3. Check 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 looseness and/or rust. Coat terminals
with grease or petroleum jelly to prevent corrosion
buildup.
MAINTENANCE
Separator Top
Proper
Lower
7-70
U.L (Upper Level)
L.L (Lower Level)
Filler Port
Sleeve
Upper Level
Lower Level
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
M146-07-110
M146-07-111
M146-07-112
M409-07-072