Hitachi ZW180 Operator's Manual page 276

Electrolyte Level Check --- 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 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 devel-
oped, 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 bat-
tery. 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 pre-
vent battery discharge. Check terminals for loose and/or
rust. Coat terminals with grease or petroleum jelly to pre-
vent corrosion build up.
MAINTENANCE
Proper
Lower
7-76
Filler Port
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.
U.L (Upper Level)
L.L (Lower Level)
M146-07-109
Sleeve
Upper Level
Lower Level
M146-07-110
M146-07-111
M146-07-112
M409-07-072