Stanley MB256, User Manual

MB256 User

 Manual ◄ 17

Figure 12. Charge Pressure Specification For the MB256

505232 Charge Hose 

Assy (includes gauge, 

valve, hose and charge 

valve adapter)

28257 Tester

Nitrogen Bottle (locally obtained)

Manifold Accumulator

Surge Accumulator

Main Accumulator

CHARGE PRESSURE SPECIFICATION

Main Accumulator: 350 PSI +/- 20 PSI - 24 BAR +/- 1.4 BAR
Manifold Accumulator 300 PSI +/- 20 PSI - 21 BAR +/- 1.4 BAR
Surge Accumulator 1000 PSI +/- 20 PSI - 69 BAR +/- 1.4 BAR

The tools required to charge the accumulators are 

the 505232 Charge Hose Assembly and the 28257 

accumulator tester, which are used with other 

STANLEY model breakers. When charging the 

accumulators, make sure the tools and charge valves 

are clean. Dirt can contaminate the charge valves and 

cause leakage.

1. 

Remove the protective plug from the accumulator 

charge valve.

Note: There are three accumulators on this breaker; 

the  main  accumulator,  the  manifold  accumulator 

and the surge accumulator.

2. 

Hold the chuck end of the tester and turn the gauge 

fully counter clockwise to ensure the plunger inside 

the chuck is completely retracted.

3.  Screw the tester into the breaker charge valve 

by turning the chuck. Do not use the gauge for 

turning as this will advance the plunger in the 

chuck. Tighten the chuck lightly against the breaker 

charge valve.

4. 

Turn the gauge clockwise to advance the plunger 

until a pressure is indicated on the gauge. Do not 

overtighten.

5.  If the pressure is correct, unscrew the gauge to 

retract the plunger. Then, loosen and remove the 

tester from the charge valve. If the pressure is not 

correct, proceed to step 6.

Note: When disengaging the tester a "POP" of 

nitrogen is normal.

6.  Connect the charge hose assembly to the charging 

valve on the tester. Make sure the valve on the 

charge hose assembly is closed. Open the valve 

on the nitrogen bottle.

7. 

Very slowly open the valve on the charge hose 

assembly and slowly meter the nitrogen into the 

breaker charge valve until the tester reads the 

correct charge pressure.

8.  When the correct pressure is obtained, close the 

valve on the charge hose assembly and on the 

nitrogen bottle. Unscrew the gauge to retract the 

plunger. Loosen and remove the tester from the 

charge valve. Before replacing the protective plug, 

inspect the plug O-ring. If damaged or deformed, 

replace the plug. Apply Loctite™ 242 to plug and 

cap.

CHARGING THE ACCUMULATOR