Hyundai HL955 Manual page 503

10. ACCUMULATOR
The accumulator is installed at the safety
valve. When the boom is left the raised
position, and the control levers are operated
with the engine stopped the pressure of the
compressed nitrogen gas inside the
accumulator sends pilot pressure to the
control valve to actuate it and allow the boom
and bucket to come down under their own
weight.
Type of gas
Volume of gas
Charging pressure of gas 16 kg/cm
Max actuating pressure 128 kg/m
Nitrogen gas (N )
2
0.75ℓ(0.2 U.S.gal)
(228 psi)
2
(1820 psi)
2
6-39
1 Diaphragm
2 Steel pressure vessel
3 Closure button
1
2
3
7803AWE56