Komatsu D31EX-21, Operation & Maintenance Manual, Page: 221 / 256

MAINTENANCE
SERVICE PROCEDURE
4-41
CHECK LEVEL OF BATTERY ELECTROLYTE 4
Carry out this check before operating the machine.
WARNING
q
Do not use the battery if the battery electrolyte level is below the LOWER LEVEL line. This will acceler-
ate deterioration of the inside of the battery and reduce the service life of the battery. In addition, it
may also cause an explosion.
q
The battery generates flammable gas and there is danger of explosion, so do not bring fire or sparks
near the battery.
q
Battery electrolyte is dangerous. If it gets in your eyes or on your skin, wash it off with a large amount
of water and consult a doctor.
q
When adding distilled water to the battery, do not allow the battery electrolyte to go above the UPPER
LEVEL line. If the electrolyte level is too high, it may leak and cause damage to the paint surface or
corrode other parts.
NOTICE
When adding distilled water in cold weather, add it before starting operations in the morning to prevent
the electrolyte from freezing.
Inspect the battery electrolyte level at least once a month and follow the basic safety procedures given below.
WHEN CHECKING ELECTOLYTE LEVEL FROM SIDE OF BATTERY
If it is possible to check the electrolyte level from the side of the battery, check as follows.
1. Open the battery inspection cover at the rear on the right side of the machine.
2. Use a wet cloth to clean the area around the electrolyte
level lines and check that the electrolyte level is between
the UPPER LEVEL (U.L.) and LOWER LEVEL (L.L.) lines.
If the battery is wiped with a dry cloth, static electricity may
cause a fire or explosion.
3. If the electrolyte level is below the midway point between
the U.L. and L.L. lines, remove cap (1) and add distilled
water to the U.L. line.
4. After adding distilled water, tighten cap (1) securely.
REMARK
If distilled water is added to above the U.L. line, use a syringe
to lower the level to the U.L. line. Neutralize the removed fluid
with baking soda (sodium bicarbonate), then flush it away with
a large amount of water or consult your Komatsu distributor or
battery maker.
UPPER LEVEL
LOWER LEVEL