06-B50 TECHNICAL MANUAL-ENGINEERING CPY-2009 - REED

REED MODEL: B50TRAILER CONCRETE PUMPMAINTPAGE 46PRE-CHARGE PRESSUREPre-charge pressure as it relates to the accumulator is the insertion of dry nitrogen gas intothe bladder, prior to installation or use. On a new machine the accumulator is pre-chargedat the factory. When a replacement is shipped from the factory it is NOT PRE-CHARGEDunless shipped by over land or ground. A charged accumulator is a pressurized vesselthus it is against the law to ship by AIR FREIGHT.Periodically due to usage or leakage the bladder may loose some of the pre-charge whichdoes affect the operation of the accumulator. As a result it is important that the pressure bechecked at least once a year or when there is a noticeable change in the operation. Thefollowing is offered to assist you in servicing the accumulator.A Charging and Gauge Kit is required to performmaintenance on the accumulator. It is available fromthe REED Parts Department and you will find that it tobe a good investment for your workshop.CHECKING PRESSUREPrior to checking of the accumulator pre-charge pressure the machine must be shut-downand all hydraulic pressure and fluid in the accumulator has been relieved.REVISION: