Bleeding The Hydraulic System; Operation; Maintenance - REHOBOT PP70-2500 Gebrauchanweisung

of at least 0,6 MPa (6 bar, 87 psi) to develop hydraulic pressures of 70
MPa (700bar, 10150 psi) and 80 MPa (800 bar, 11,600 psi). Make sure
that the air pressure does not exceed 1,0 MPa (10 bar, 145 psi) as this
could damage the pump. To ensure effi cient operation and long life use
clean compressed air with a water trap. Connect the compressed air line
using a G 1/4" coupling, as shown in Fig. 2, item A.
Connecting the hydraulic hose
Connect the hydraulic hose using a G 1/4" coupling (Fig. 2, items B, C) or
use REHOBOT quick couplings.
PP70/80-2500MRV
Connecting compressed air
The pump requires a compressed air pressure of at least 0,6 MPa (6 bar,
87 psi) to develop hydraulic pressures of 70 MPa (700bar, 10150 psi)
and 80 MPa (800 bar, 11,600 psi). Make sure that the air pressure does
not exceed 1,0 MPa (10 bar, 145 psi) as this could damage the pump. To
ensure effi cient operation and long life use clean compressed air with a
water trap. Connect the compressed air line using a G 1/4" coupling, as
shown in Fig. 2, item A.
Connecting the hydraulic hose
Pressure connection: connect the hydraulic hose using a G 1/4" coupling
(Fig. 2, item B) or use REHOBOT quick couplings. Return connection:
connect the hydraulic hose using a G 1/4" coupling (Fig. 2, item C) or use
REHOBOT quick couplings.

Bleeding the hydraulic system

When hoses or tools are connected to the pump they can introduce air into the
hydraulic system, which could lead to operating problems. Bleed the system
by running the tool or cylinder through 3–4 cycles (by pumping out until fully
extended, then releasing) with no load. Make sure that the tool or cylinder is
kept lower than the pump to allow the air to fl ow back into the oil reservoir of the
pump. It may be necessary to top up the oil depending on the volume of air in the
connected hoses or tool, see Filling with oil.

Operation

In order to use the full capacity of the oil reservoir the ventilation plug must
be opened (pull up) before pumping, see Fig. 3.
NOTE, make sure that the plug is closed (pushed in) when transporting
the pump.
PP70-2500FP
Starting
To extend the cylinder or tool, press the pressure pedal (Fig. 4, item A). The
pump will stop and maintain the achieved hydraulic pressure when the
pedal is released in the neutral position.
Releasing
To release the cylinder or tool, press the release pedal (Fig. 4, item B).
Hold the pedal down until the cylinder has moved back to the desired
position.
NOTE! If the pump is overfi lled when a cylinder or tool is released, the sur-
plus oil will run out through the bleed valve.
PP70/80-2500RC
Starting
Press the start/stop button (Fig. 4, item P) on the control unit. The pump
will stop and maintain the achieved hydraulic pressure when the start/
stop button is released.
Releasing
Press the return button (Fig. 4, item R). Hold the button in until the cylin-
der has moved back to the desired position.
REHOBOT Hydraulics AB Skjulstagatan 11 A, 632 29 Eskilstuna, SWEDEN P.O. Box 1107 631 80 Eskilstuna
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NOTE! If the pump is overfi lled when a cylinder or tool is released, the sur-
plus oil will run out through the bleed valve.
PP70-2500MLD
Select which ports you want to act as the pressure port and return port by
turning the control valve to the right or left.
Starting
To extend the cylinder or tool, press the pressure pedal (Fig. 4, item A). The
pump will stop and maintain the achieved hydraulic pressure when the
pedal is released in the neutral position.
Releasing
Turn the control valve to the right or left to switch between pressure and
return ports.
NOTE! If the pump is overfi lled when a cylinder or tool is released, the sur-
plus oil will run out through the bleed valve.
PP70-2500MRV
This pump is designed for connecting to tools with their own control valve or
other external valve.
Starting/releasing
Connect the control valve to the air supply.
The pump can also be used with single-acting hydraulic tools. In this case
the pressure is released by turning the release knob (Fig. 4) anti-clockwise.
Accessories
The pump can be equipped with accessories such as a gauge / gauge
adapter, etc. It is possible to connect a return pipe. All rams, accessories,
and tools that are connected to the pump must be designed for a working
pressure that is equal to or higher than the maximum working pressure of
the pump. NOTE! The pump is equipped with a safety valve on the hydraulic
side. It has been factory-set for maximum working pressure. The safety
valve (Fig. 4, Pos. A) can be adjusted ONLY by REHOBOT or a workshop
authorized by REHOBOT. For simple reduction of the hydraulic pressure, we
recommend you to use a reduction valve for incoming compressed air.

Maintenance

When necessary lubricate moving parts such as the pneumatic piston and
valve with high-grade grease.
Service
For safety reasons it is important that all service and repair work is carried
out by trained personnel. If you are in the slightest doubt please contact
your dealer for information about the nearest authorised service agent.
Filling with oil
Check the oil level before use. The easiest way to do this is to check the
level glass on the end of the pump, which shows the maximum oil level. Al-
ways measure the oil level with the cylinder or tool in the lowest or retracted
position. To ensure effi cient operation use hydraulic oil that conforms to ISO
VG
• Stand the pump on end with the level glass at the
bottom (Fig. 5).
• Unscrew the oil fi ller plug (Fig. 5, item A).
• Fill the oil reservoir through the fi ller hole until the oil
level is 43 mm (1.7 in) below the end face.
• Screw the oil fi ller plug back into place.