J&M 220 Operating And Maintenance Manual - page 45

MODEL 220 

HYDRAULIC 

IMPACT HAMMER 

IV. 

MAINTENANCE AND ADJUSTMENTS 

 P. 

CHARGING 

ACCUMULATORS 

CAUTION: DO  NOT CHARGE (FILL) ACCUMULATORS WITH ANY OTHER GAS 

THAN NITROGEN.  DO NOT ATTEMPT TO DISASSEMBLE EITHER 

ACCUMULATOR WITHOUT REMOVING (VENT) THE ENTIRE GAS 

CHARGE. 

1.  Connect the charging kit (P/N 810833) to a 2000+ PSI (138 Bar) nitrogen gas 

bottle. 

2.  Unscrew the dirt cover from the accumulator gas valve. 

3.  Connect accumulator adapter assembly (charge kit) to the accumulator, gas 

valve, to be charged. 

4.  Screw in (CW) “T” screw, on accumulator adapter assembly to depress ( open) 

the accumulator gas valve. 

5.  Read the existing accumulator charge pressure on the charge kit gage.  See 

page V-4 for correct pressures. 

6.  To increase charge pressure, carefully “crack” open the nitrogen gas bottle 

valve until the charge kit gage pressure reaches the specified pressure level. 

CAUTION: DO  NOT OPEN NITROGEN VALVE RAPIDLY, AS GAS BOTTLE 

PRESSURE MAY EXCEED ACCUMULATOR PRESSURE RATING. 

7.  To decrease charge pressure, open the bleed valve, on the accumulator 

adapter, until the charge kit gage reaches the specified pressure level. 

8. After the desired charge pressure has been attained, allow the system 

temperature to stabilize for 10 to 15 minutes, then recheck the charge pressure. 

9. Unscrew the “T” screw, on accumulator adapter assembly to close the 

accumulator gas valve. 

10. Remove charge kit and re-install the gas valve dirt cover. 

IV-12