Bosch Rexroth Corp., Model HAB..-7X,
RA 50175-B/07.2016
5 General
Hydraulic circuits incorporating accumulators may store hydraulic oil under pressure
depending on the function of the accumulator in the system. Therefore, the system may
remain pressurized after the pump is turned off.
CAUTION
Prior to performing any maintenance or system modifications, bleed off any stored
system pressure.
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Completely release all hydraulic fluid pressure in a safe controlled manner using
appropriate valving.
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Installation of an automatic accumulator discharge valve in the hydraulic circuit is
recommended.
5.1
Bladder accumulators
Bladder accumulators will ship from the factory with a primer coating on the shell and with
a rust preventative applied to other surfaces. The exception to this policy would be if Bosch
Rexroth supplies a complete power unit assembly or accumulator stand and the customer
specifies a particular finish coating on the entire unit.
It is the user’s responsibility to provide sufficient corrosion protection corresponding to
the ambient conditions that the accumulator will be exposed to over the life time of the
equipment. If a finish coat is desired, it is strongly recommended to mask the accumulator
nameplate and all caution / warning labels prior to painting.
NOTE! Nameplate information is required for warranty evaluation and replacement purposes,
therefore proper masking should preserve the condition of the nameplate for future use!!
Bladder type accumulators are delivered with a nitrogen precharge pressure of approximately
25 psi (2 bar) for shipping purposes unless a higher pressure is specified in the accumulator
model code. After installation and prior to initial start-up, the precharge pressure must be set
to the application requirements, or machine manufacturer’s specifications.
CAUTION
Improper accumulator precharge may result in decreased life or failure of the bladder.
14
General
