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Maintenance Accumulators and Accessories General Information The condition of the accumulator is primarily determined by periodic checking of gas pre-charge pressure. Only qualifi ed personnel should perform any maintenance on accumulators. Nitrogen gas pre-charge pressure should be checked at least once during the fi rst week of operation to ensure that no leak has developed. The pre-charge pressure and ambient temperature should be recorded at installation and checking done at the same temperature if possible. If there is no loss of gas pre-charge pressure, it should be rechecked in approximately 4 months. Thereafter, it should be checked annually. Check pre-charge if the system is acting sluggishly. If pre-charge is low, check gas valve for leakage and recharge. Bladder Accumulators 1 Use appropriate valving in the hydraulic system to discharge all hydraulic fl uid from accumulator. 2 To check or adjust pre-charge pressure, HYDRAULIC PRESSURE MUST BE REDUCED TO ZERO. Pre-charge pressure should be checked periodically. 3 Charging and checking should be done with an accumulator charge kit similar to Stauff Part # STA-CK-1. 4 Remove gas valve protection cap and valve cap as per pre-charge procedure instructions (B) on page 14 5 Attach gauge assembly to accumulator gas valve. 6 Make sure bleed valve B (Figure 1.) is closed, depress gas valve core gently by turning valve A (Figure 1.) clockwise. Gas pressure can now be read on gauge. 7 To reduce pressure, open bleed valve B (Figure 1.) carefully, allowing gas to escape until desired pressure is obtained. It the pre-charging pressure is less than required, refer to the pre-charging procedure on page 14 B A Figure 1 D C - Safety pattern gauge. NOTE: Allow accumulator to rest about 10-15 minutes after gas pre-charging. This will allow gas temperature to adjust and equalize. Recheck gas pressure and adjust if necessary. Check accumulator gas valve for any leaks with soapy water. The kit has adaptors to connect the hose to the nitrogen cylinder as well as adaptors to connect the charging/pre-loading/gauge set to the accumulator. - Stauff recommend the use of nitrogen gas only for pre-charging of accumulators. - Always wear protective safety glasses. 15
Disassembly Instructions Bladder Type Remove protective cap Remove complete gas valve or gas valve core only Undo lock ring and remove fl ange washer Remove the fl uid port and bladder 16 1 4 7 10 Accumulators and Accessories NOTE: It is good practice to disassemble accumulators in a clean area to keep all parts free of foreign matter. Remove gas valve cap 2 5 Remove locknut and metal label 8 Push fl uid port inside of shell and remove o-ring and back up ring Release nitrogen from the accumulator using Stauff charge kit #STA-CK-1 Remove bleed plug (2 different models shown) 3 6 9 Squeeze the anti extrusion ring(AER) through the opening
Page 1 and 2: STAUFF Accumulators and Accessories
Page 3 and 4: CONTENTS 2 Accumulators and Accesso
Page 5 and 6: Material Options and Features 4 Mai
Page 7 and 8: 6 Accumulators and Accessories Stau
Page 9 and 10: 8 Part No. Accumulators and Accesso
Page 11 and 12: Safety Blocks 10 P Stauff Code Accu
Page 13 and 14: Clamps and Brackets Saddle Clamps S
Page 15: Precharging Procedure General Infor
Page 19 and 20: Sizing Chart for Storage Applicatio
Page 21 and 22: STAUFF Australia HEAD OFFICE SYDNEY
Page 23 and 24: A In-Line Flow Monitors Stauff’s
Page 25: PHYSICAL DETAILS Monitor Switch Ala

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