Accumulator Assembly

Accumulator And Switches:

The accumulator has a nitrogen charged chamber separated from the pressurized hydraulic oil by a diaphragm. The pressurized nitrogen stores system pressure and maintains boost pressure when the pump is inoperative or if a failure occurs. A non-return valve prevents return flow and maintains pressure on the accumulator side of the system. Two pressure switches are mounted on the accumulator base.

Charge switch operating pressures should be:

Open (no system charging) 1450 psi (100 bar)
Closed (system charging) 1204 psi (83 bar)

Low pressure warning switch pressures should be:

Open (VCM warning on; UP disabled) 783 psi (54 bar)
Closed (VCM warning off; UP enabled) 1000 psi (69 bar)