Komatsu D31EX-21, Operation & Maintenance Manual, Page: 222 / 256

SERVICE PROCEDURE
MAINTENANCE
4-42
WHEN IT IS IMPOSSIBLE TO CHECK ELECTROLYTE LEVEL FROM SYDE OF BATTERY
If it is impossible to check the electrolyte level from the side of the battery, or there is no display of the UPPER
LEVEL line on 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. Remove cap (1) at the top of the battery, look through the
water filler port, and check the electrolyte surface. If the
electrolyte does not reach the sleeve, add distilled water so
that the level reaches the bottom of the sleeve (UPPER
LEVEL line) without fail.
Use the diagram below for reference, and check if the electrolyte reaches the bottom of the sleeve.
3. After adding distilled water, tighten cap (1) securely.
REMARK
If distilled water is added to above the bottom of the sleeve, use a syringe to lower the level to the bottom of the
sleeve. 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.
WHEN IT IS POSSIBLE TO USE INDICATOR TO CHECK ELECTROLYTE LEVEL
If it is possible to use and indicator to check the electrolyte level, follow the instructions given.
A
B
Filler port
Sleeve
Upper
Lower
A
Correct level
The electrolyte level is up to the bottom of the
sleeve, so the surface tension causes the surface
to rise and the plate appears to be warped.
B
Too low (level)
The electrolyte level is not up to the bottom of the
sleeve, so the plate appears to be normal.