Checking Pressure In Piston Accumulator And Refilling If Required - Chicago Pneumatic CP 550 Operating Instructions Manual

10.5.11 Checking pressure in piston accumulator and refilling if required

For checking the piston accumulator of the hydraulic
breaker you need:
1 nitrogen filling device
1 pressure gauge 1/4", 0 25 bar, test class 1.6
1 nitrogen cylinder
1 adapter, country specific
These items should be on hand at all times to allow
the following checking and maintenance work to be
performed.
CHECKING
If the performance of the hydraulic breaker starts to
drop, the gas pressure in the breaker's piston accu
mulator should be checked. The piston accumulator
does not need to be refilled until the gas pressure
has dropped to the minimum level or below.
Note
The pressure should be checked at an operating
temperature of 60 °C to 70 °C.
Lay the hydraulic breaker flat to check the pressure.
Do not apply contact pressure to the working tool.
Unscrew the plug from filling valve »G« and connect
up the pressure gauge.
Read off the pressure.
The required pressure in the piston accumulator is as
follows:
               Â
               Â
60 70 °C + no contact pres
               Â
sure to the working tool!
                    Â
Model
Minimum
          Â
gas pres
          Â
          Â
CP 550 14.0 bar
CP 750
CP 1150
CP 1650
CP 2250 12.0 bar
CP 3050 12.5 bar
CP 4250
FILLING / REFILLING
Note
If a country specific adapter is required it has to be
fitted between nitrogen cylinder and pressure relief
valve.
Preparations:
H Connect the pressure relief valve to the nitrogen
cylinder.
H Connect one nozzle of the filling hose to the Mini
mess port on the pressure relief valve.
H Close the pressure relief valve
H Open the valve on the nitrogen cylinder
42
at operating pressure
     Â
     Â
Required gas
pressure
     Â
sure
     Â
17.3 bar
9.5 bar 11.9 bar
5.2 bar 7.0 bar
5.3 bar 8.2 bar
15.5 bar
16.0 bar
8.6 bar 11.5 bar
Port for test
G
pressure gauge
T
L
P
CL
P
Port for test
pressure gauge
G
Port for test pressure gauge
G
F
P T
V
CL
P
G
Port for test
pressure gauge
CP 550, CP 750
The graphic
may vary for
different brea
ker models.
CP 1150
CP 1650
CP 2250
CP 3050
CP 4250