Lukas LH2 - Manual (Page 22)

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Operation 9.
9.1 Notes for a secure operation of the hand pump
9.3 Hand pump with base plate
1. Close discharge valve on the hand pump completely (rotate clockwise).
2. Connect the return line of the device at the return port “T” and then the high pressure line
at the pressure port “P”.
3. Move the locking pin into the operating position.
4. Supply the device with hydraulic fluid or pressurise by operating the pump lever (up and
down movements).
9.2 Hand pump (basic pump)
1. Close discharge valve on the hand pump completely (rotate clockwise).
2. Connect the single-acting tool onto the pressure port “P”.
3. Move the locking pin into the operating position.
4. Supply the device with hydraulic fluid or pressurise by operating the pump lever (up and
down movements).
5. To reduce the pressure of the device, slowly open the discharge valve of the hand pump
(turn counter-clockwise). In this way, you can meter the pressure reduction precisely.
Make sure, that the discharge valve is opened completely and the tool is in basic position
before you disconnect the tool.
WARNING / CAUTION!
Under certain circumstances, the pump handle can "kick back". Make sure that
your body remains to the side of the pump.
ATTENTION!
Never attach an extension to the pump handle that does not belong to the
device. These extensions usually cause the pump to become unstable during
operation.
NOTE:
In order to limit the required force in high pressure operation, we recommended
using short strokes with the pump handle. The greatest pumping effect is produced
in the last 5 degrees of the stroke.
Should you use a female quick-disconnect-coupling as the port, quick stop may be
triggered if the discharge valve is opened too quickly (turning counter-clockwise),
i.e. the check valve incorporated in the male quick-disconnect coupling blocks
the return flow of oil while the connection between pump and female quick-
disconnect coupling is depressurised. This is provided as a safety function in case
the connection between the female quick-disconnect-coupling and pump starts
to leak and the pressure drops abruptly. In this case, the "quick stop" prevents,
for example, an abrupt drop in the load when an hydraulic cylinder is operated.
In order to release the quick stop again, more pressure must first be supplied to
the device. Then, the pressure can be decreased again by slowly opening the
discharge valve.