Check Accumulator Function, Gas Leakage; Looseness, And Damage - Hitachi ZW 310-6 Operator's Manual

Check Accumulator Function, Gas Leakage,

Looseness, and Damage

--- every 500 hours
d
WARNING:
 Allow only qualified personnel to handle the
accumulator.
 High-pressure nitrogen gas is enclosed in the
accumulator. Caution is required to prevent fires
from occurring.
 Never strike the accumulator. Keep the accumulator
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
engine stopping, the monitor indicators come ON.
2. Precheck that alarm function is deactivated:
Start the engine. Run the engine at middle speed to
pressurize the accumulator. When the pressure builds in
the accumulated in the accumulator, the alarm buzzer
stops sounding and the brake oil pressure indicator goes
OFF. At the same time, ensure the brake oil pressure
gauge on the monitor screen indicates maximum value.
3. Note 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 confirmed as
normal. Besides the above points, check the accumulator
for gas leakage, looseness, and damage. If any
abnormality is found, immediately consult your nearest
Hitachi dealer.
MAINTENANCE
7-105
Parking Brake Accumulator
Service Brake Accumulator
90Z7B-7-98-1