Lukas 81-50-35, Instruction Manual

14

NOTE:

To bleed connected equipment, make sure that the highest point of the connected 

devices are below the level of the pump.

Before operating the pump, you should also open the oil fill screw plug. Only in this 

way can any trapped air escape the hydraulic system when the pump is operated. 

You should operate the connected equipment 

several times without load

.

When you do this, also follow the separate operating instructions of the connected 

devices.

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.

8.  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.

Procedure:

1.  Close discharge valve on the hydraulic 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).

5. To reduce the pressure of the device, slowly open the discharge valve of the hydraulic 

pump (turn counter-clockwise). In this way, you can meter the pressure reduction precisely.

  8.1 Operation