Start-Up; Connecting The Oil Return Line; Compressed Air Connection To Main Line; Operation - Bell HP250 Use And Maintenance Manual

5.2 - Start-up

THE INSTALLATION OF A DEVICE THAT INTERCEPTS THE PNEUMATIC AIR SUPPLY IS RECOMMENDED
TO RAPIDLY DISCONNECT THE PUMP FROM PNEUMATIC CIRCUIT IN CASE OF NEED OR MAINTENANCE.
BEFORE CARRYING OUT ANY CONNECTIONS, VERIFY THE CONDITION OF FITTINGS AND SEALS AND
ENSURE THREADS AND PIPES ARE CLEAN AND INTACT.
● Connect the hydraulic pressure hose (fig.7, page 12). The hose must be fitted with a 3/8" NPTF coupling after binding the thread
with Teflon tape.
● Unscrew the breather screw above the oil plug (fig.6, page 3) by three or four turns using an appropriate screwdriver.
5.3 - Connecting the oil return line (use with a double acting cylinder)
● Unscrew the oil plug using a hexagon spanner ø 17 (fig.6, page 3) and connect a hose with 1/4" GAS fitting after wrapping with
Teflon tape.

5.4 - Compressed air connection to main line

● Screw a quick coupler (1/4" GAS), suitable for your system, into the inlet connection for compressed air (fig. 7, page 12), carefully
wrapping the thread with Teflon tape.
● The quick coupler must be connected to an air line supplying compressed air at between 5 and 8 bar (see "TECHNICAL SPECIFI-
CATIONS", page 14).
WARNING:
BEFORE OPERATING THE PUMP, ENSURE THAT ALL HYDRAULIC PIPES CONNECTIONS ARE CORRECTLY
TIGHTENED . THIS OPERATION MUST BE CARRIED OUT WITH APPROPRIATE EqUIPMENT

6 - OPERATION

THE USE OF THE PUMP IN POTENTIALLY ExPLOSIVE ENVIRONMENTS, IF NOT DULY PROTECTED (PROTEC-
TION NOT SUPPLIED) IS STRICTLY FORBIDDEN. POSSIBLE ACCUMULATION OF ELECTROSTATIC CHARGES.
The pump is extremely simple to use:
● To activate the pump press the "PUMP" push-button on the remote drive (fig.3, page 3). The pump will start to deliver pressurized
oil and thereby cause the connected machine to operate.
● When the push-button is released, the pump stops but the pressure is maintained on the oil side so that the connected machine
cylinder holds the load in the position it has reached.
● To return the pressure to zero and hence retract the machine cylinder to its starting position, press the "RELEASE" push-button on
the remote drive (fig.4, page 3).
WARNING
IMMEDIATELY AFTER THE PUMP INSTALLATION, THE CIRCUIT MAY CONTAIN AIR LOCKS WHICH PRE-
VENT PRESSURIZATION. IF THE PUMP IS UNABLE TO PRESSURIZE THE OIL CIRCUIT, PROCEED AS
DESCRIBED BELOW.
● Press the "PUMP" and the "RELEASE" push-button at the same time for about 15 seconds.
The pump should now work correctly. If you still have problems, repeat the above mentioned procedure.
193551070 v.1 - UPD 06022020
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