Check Operation Of Starting Switch, Check Meshing Of Pinion Gear; Check Wiring Connections For Looseness - Komatsu AX20 Operation & Maintenance Manual

31. MAINTENANCE
31.3.6 ELECTRICAL COMPONENTS
n CHECK OPERATION OF STARTING SWITCH, CHECK MESHING OF PINION GEAR
n CHECK SPECIFIC GRAVITY OF BATTERY ELECTROLYTE
Precautions when handling battery:
• Battery electrolyte is dangerous. If it gets into your eyes or on your skin or clothes, wash it off
with large amounts of water quickly and seek medical attention immediately.
• Keep away from sparks or flame.
• To avoid gas explosions, do not smoke or cause short circuits or sparks near the battery.
1. Charge the battery, and after charging, check that the battery
electrolyte level is correct. If the electrolyte level is below the
top of the electrode plates, add distilled water to the top of the
plates. Check and clean battery caps and terminals. Check
the battery case for cracking and stains caused by leakage.
2. Using a specific gravity meter and thermometer, measure the
specific gravity and temperature of the battery electrolyte.
3. Insert the values measured in Steps 1 and 2 in the formula
below and calculate S
(20°C).
S : Specific gravity (measured value) at t°C
t
t: Temperature of battery electrolyte (measured value)
• Normal value: S
• If specific gravity is below 1.225, check terminals, cables, charging system and repair as
necessary.
4. Charge the battery if necessary.
Specific gravity
of electrolyte
1.280
1.240
1.210
1.130
n CHECK WIRING CONNECTIONS FOR LOOSENESS
4-24
, which is the specific gravity at 68°F
20
S S 0.0007 t 20
( )
20 t
= 1.27 - 1.29
20
Condition of
charge
Fully charged
1/4 discharged
1/2 discharged
Fully discharged
Charge
needed?
No
Yes
RELATION BETWEEN SPECIFIC GRAVITY
AND TEMPERATURE OF ELECTROLYTE