Larzep HBM Series, Operating And Maintenance Instructions Manual

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Instruction Manual
Hydraulic Electrical Pumps “HBE” “HBM”

Use a pressure gauge at this point to check that the internal safety valve is set correctly to 700 bar.

If you wish to check the pressure of an installation without pressing the remote pendant (open centre, ‘P’ connected to ‘T’ and forward and
back movements blocked) or with the manual control set to ‘C’, you should place the pressure gauge and its corresponding gauge adaptor
in the output of the distributing valve.

If you do not press the remote pendant or the manual valve control is set to ‘C’, the distributing valve’s check valves will maintain the
pressure in the circuit.

If the proposed operating pressure is less than 700 bar, use the external pressure relief valve.

Use a spanner to loosen the lock nut and a screwdriver to loosen (counter‐clockwise – reduces pressure) or tighten (clockwise – increases
pressure) the adjustment screw. Use a pressure gauge to check that the desired operating pressure has been reached, and then block the
adjustment screw using the lock nut to prevent unwanted loosening due to vibrations.

Check for leaks when working under pressure and make sure that the machine and the installation are working correctly in accordance with
the established application.

The above steps should be repeated as many times as necessary, until the operator has become familiar with the working of the machine.

In HBE‐series pumps with electrical control, check the correct working of the emergency stop mechanism: the RED EMERGENCY BUTTON in
the remote pendant.
WARNING: DEPRESURISSATION (only for HBE‐series)
This solenoid valve could build up pressure. To depressurize:
o
Block the load and assure it in a safe way.
o
Cut‐off the power supply.
o
Turn the locking handles in each solenoid valve from right to left (clockwise) to release the pressure.
o
Once the solenoid valves are without pressure the quick couplers should be loosen easily.
o
Release the quick coupler and turn the locking handles to their original position. Move them from left to right (counter‐clockwise).
VALVE CHANGE from 4/3 to 3/3 (only for HBM‐series)
If you have an equipment with number 4 in the third position of the reference HBM _ _ 4_ or (For example: HBM3441), you have an
equipment with a valve AZ8400, for double acting cylinders.
If you have a single acting cylinder and you want to use your powerpack with this kind of cylinder you must follow the steps below:
1‐ Remove the screws (4) of the manual valve AZ8400.
2‐ Take the manual valve off from the lid of the powerpack.
3‐ A pressure inlet hole is located in the center of the lower side of the valve and there are 2 hexagonal screws on both sides of the
hole.
4‐ One screw corresponds to the B outlet port located in front of the manual valve; this screw is allocated in the perpendicular to B
outlet.
5‐ Remove this screw and then the ball and the spring.
6‐ Put them in the bag supplied with the rest of the pieces.
7‐ Take the steel plug supplied with the powerpack in the plastic bag (Code: 15L0021) and screw it in the B outlet.
8‐ Place the manual valve on the powerpack and put the 4 screws.
9‐ In this moment the equipment is ready to work with a single acting cylinder. (A Position: Advance / C Position: Maintains the load /
B Position: Return of the cylinder)
If you have an equipment with number 2 in the third position of the reference HBM: _ _ 2_ (For example: HBM3421), you have an equipment
with a valve AZ8200, for single acting cylinders.
If you have a double acting cylinder and you want to use your powerpack with this kind of cylinder you must follow the steps below:
1‐ Remove the screws (4) of the manual valve AZ8400.
2‐ Take the manual valve off from the lid of the powerpack.
3‐ A pressure inlet hole is located in the center of the lower side of the valve and there is one hexagonal screw on one side of the hole,
and a threaded hole in the other side.
4‐ Take the hexagonal screw supplied in the plastic bag and place the spring, the retention ball and the copper washer in the manual
valve.
5‐ Place the screw with the rest of pieces in the threaded hole.
6‐ Place the manual valve on the powerpack and put the 4 screws.
7‐ Remove the steel plug from the B outlet.
8‐ In this moment the equipment is ready to work with a double acting cylinder. (A Position: Advance / C Position: Maintains the load /
B Position: Return of the cylinder)
ALL THESE CHECKS SHOULD BE CARRIED OUT WITHOUT A LOAD. THEIR AIM IS TO ENABLE OPERATORS TO
BECOME FAMILIAR WITH THE WORKING OF THE MACHINE.