4.9 Service procedure
Every 250 hours service Maintenance
4-66 WA470-6H – VEAM946100
Checking function of accumulator
For details of handling the accumulator, see "Accumulator
(2-37)".
Brake accumulator
If the engine stops when the machine is traveling, the oil pres-
sure in the accumulator can be used to apply the brake as an
emergency measure.
1. Stop the machine on level ground and lower the work equip-
ment completely to the ground.
2. Apply the parking brake.
3. Start the engine, run it at a mid-range speed for 1 minute,
then stop the engine.
4. Turn the starting switch key to the ON position and depress
the brake pedal repeatedly.
" If the brake oil pressure caution lamp does not light up
even when the brake is depressed 6 times, the gas pres-
sure in the accumulator is normal.
" If the brake oil pressure caution lamp lights up when the
brake has been depressed 5 or less times, the gas pres-
sure in the accumulator has probably dropped. Please
contact your KOMATSU distributor to have the accumu-
lator inspected.
REMARK
Carry out the check within 5 minutes after stopping the engine. If
the machine is left with the engine stopped, the accumulator
pressure will drop and it will be impossible to check the cause of
the problem.
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