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3
Check Accumulator Function, Gas Leakage, Loose-
ness, and Damage --- ever 500 hours
WARNING:Allow only qualified personnel to handle
the accumulator.
• High-pressure nitrogen gas is enclosed in the accu-
mulator. Caution is required to prevent fires from
occurring.
• Never strike the accumulator. Keep the accumula-
tor away from sparks and/or flames.
• Do not directly heat the accumulator. Do not weld
the accumulator housing.
• Be sure to release pressure before starting to work
on the pipe lines.
1. Precheck that alarm function is activated:
Precheck that when the brake pedal is strongly stepped
more than 5 strokes with the key switch ON and the en-
gine stopping, the monitor indicators come ON.
2. Precheck that alarm function is deactivated:
Start the engine. Run the engine at middle speed to pres-
surize the accumulator. Check that when the specified
pressure is accumulated in the accumulator, the alarm
buzzer stops sounding and the brake oil pressure indica-
tor goes OFF.
3. Precheck how many times the brake pedal is stepped:
Check that the brake pedal can be stepped more than 5
strokes before the monitor indicators come ON with the
key switch ON and the engine stopping.
Three points described above must be normally confirmed. Be-
sides the above points, check the accumulator for gas leakage,
looseness, and damage. If any abnormality is found, immedi-
ately consult your nearest Hitachi dealer.
NOTE: Check the accumulator for the ride control system si-
multaneously when the machine is equipped with the
ride control system.
4
Check Gas pressure in Accumulator --- every 2000
Check the gas pressure at a regular interval. In the machine
is operated with the gas pressure lower than specified value,
normal brake operation and/or loading operation may not be
achieved, possibly creating very hazardous situations. Ask your
nearest Hitachi dealer for checking.
MAINTENANCE
hours
7-83
M4GB-07-100
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