Accumulator (For Ppc Circuit) - Komatsu WA250-6 Shop Manual

600 Hydraulic system

Accumulator (for PPC circuit)

Accumulator (for PPC circuit)

WA250, 250PZ-6
1. Gas plug
2. Poppet
3. Holder
4. Bladder
5. Film
6. Shell
7. Oil port
Outline
The accumulator is installed between the
q
charge valve and work equipment PPC valve.
Even if the engine stops with the work equip-
ment raised, the pressure of the compressed
nitrogen gas in the accumulator applies the
pilot oil pressure to the work equipment control
valve so that the work equipment will lower by
its weight.
Specifications
Gas used
Amount of gas (cc)
Charged pressure
(MPa {kg/cm })
2
Max. pressure used
(MPa {kg/cm })
2
SEN03830-00
Nitrogen gas
500
1.18(+0.2/0) {12(+2/0)}
(at 80°C)
3.92 {40}
55
10-600
1