bergmann ALPHA-PACK-BIN, Operating Instructions Manual

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8. The Hydraulic Power Pack
8.
01
8.1 General
The heart of the BERGMANN PACK-BIN is the hydraulic power pack.
It mainly consists of a valve block, an oil filter as well as an electric motor with oil pump.
The oil pump, an ecologically friendly and quiet gear pump, conveys oil from the tank into the hydraulic
system.
The valve block controls the oil flow in such a way that both cylinders move the compacting piston to
and fro alternatively.
After the machine has been switched on the cylinders first retract, i.e. the compacting piston moves in
the direction of the upper edge of the charging opening. When the cylinders reach the back limit
position pressure is built up until the switch over pressure is reached. Then the hydraulic valve
controls the oil flow an the A-side (piston side) of the cylinder. The displaced oil of the B-side (circular
room side) also flows via a back-pressure valve to the piston side (differential circuit). Thereby the
piston moves rapidly towards the container. When the cylinders have reached the front final position
the oil flow of the oil flowing out of the B-side is interrupted. Thus the valve is pressed into the basic
position again and the compacting piston moves backward.
Beyond this the valve block is responsible for the control of the container opening and the two extra
equipments, container full signal and container lock.
Should any problems arise with respect to the functions this may be traceable to an incorrect adjustment
of the oil pressure. In that case please contact our company or one of our service points.
We expressly point out that the adjustment of the pressure may be carried out only by an expert
authorised by our company in Lathen. An unauthorised removal of the seal will lead to an extinction
of possible guarantee claims.
The hydraulic system is filled with 92 litres of hydraulic oil. An electrical oil controller (float switch)
switches the machine off even when there is only a slight loss of oil.
An oil change should always be made once annually for single shift operation (= 8 hours per day);
when operation is for more than one shift this should be carried out more frequently.
The ambient temperature must not 60°C or fall below -5°C.
For machines located in the open and when extremely low temperatures are experienced, a suitable
grade of oil must be used, or a heating element fitted to warm the oil to its operating temperature.
Please contact the dealer or the manufacturer.
The wiring diagram for this machine can be found in the switch cabinet.
The correct use of the appropriate lubricants contributes considerably to achieving maximum efficiency
and avoiding trouble in everyday use.
Therefore we would recommend using the hydraulic oil
HLP according to DIN 51 524, part 2 with a viscosity of 32 mm²/s at 40°C.
For the initial filling of the hydraulic tank BP Energol HLP-HM 32 was used.
However, you can also use products of equally good quality. Examples are shown in the lubrication
chart in chapter 12.
8.2 The grade of hydraulic oil