MAINTENANCE INSTRUCTIONS BLADDER （维护说明书膀胱）.pdf

MAINTENANCE INSTRUCTIONS BLADDER ACCUMULATORS General  Hydraulic Accumulators are pressure vessels and may contain compressed nitrogen gas or hydraulic fluid at high pressures.  Only qualified personnel should perform maintenance.  DO NOT weld on the accumulator shell.  Always use DRY NITROGEN for precharging.  Do not use automotive valve cores in place of high pressure valve cores.  For maximum seal and bladder life, hydraulic fluid should be kept clean, filtered to 10 micron or less. HYDRAULIC PRESSURE MUST BE REDUCED TO ZERO. VENT all precharge gas prior to disassembly. NEVER USE AIR OR OXYGEN for precharge as this may result in an explosion! PRECHARGING PROCEDURE  ISOLATE, VENT and DRAIN all fluid completely from accumulator. Only check precharge when fluid pressure is “0 psi”. Figure 1—Exploded View Bottom Load Assembly  Remove valve guard (8) and valve cap (7) (Figure 1).  Use PacSeal charging and gauging assembly, part number 40-1618, to check and adjust precharge of the accumulator.  Before using the assembly, verify that the bleed valve (E) is closed and the air chuck (A) is turned fully counter-clockwise (CCW) (Figure 2).  Connect the air chuck (A) to the gas fill valve (4) on the accumulator.  Connect the hose assembly to the nitrogen bottle, then connect it to the fill valve (D) on the charging unit.  Depress the valve core by turning the charging valve clockwise (CW) until it stops (do not over torque). SLOWLY open the valve on the nitrogen bottle and allow gas to flow to the accumulator, noting pressure Figure 2—Charging and Gauging Assembly on the gauge. Rev B Tel: 714-529-9495 Fax: 714-529-1366 561 Tamarack Ave, Brea CA USA Maintenance Instruction