ROBEL 22.38/02, Operating Instructions Manual, Page: 18 / 58

Page 14
22.38 / 02
HYDRAULIC RAIL BENDER
5.4 Shaping
Danger of crushing injury in the area of pump lever
•
Pump carefully!
Damage of the base of piston!
•
Never apply full pressure to the piston without having an
object (i.e. a rail) to shape. This would force the piston inside
the bending unit against the cylinder base at full force and
could break the base of the piston.
•
Close the stop valve (pos. 6, page 5) by turning clockwise.
Once the piston starts to shape the rail, the pump automatically switches pressure
level.
•
This is the latest stage at which the extension handle (pos. 8, page 5) can be
used for pumping.
•
To achieve permanent re-shaping the rail should be bent (carefully) slightly
further than is required.

This is because the rail returns to its original shape to some extent once
released from the rail bender.
•
Repeat this process until the desired shape is achieved.
The internal safety valve opens automatically if the maximum piston stroke of 110
mm or the maximum bending force of 550 kN are exceeded or if pumping exceeds
the maximum force of 580 bar set within the pump. The hydraulic oil will flow back
into the reservoir until the level exceeded returns within permitted tolerances and in
so doing retracts the piston. This protects the appliance from damage.
Danger of trapping fingers !
•
The rail bender rapidly falls back on the side of the pump
lever.
•
Once shaping work is complete, open the stop valve by turning anti-clockwise
so that the oil flows back into the oil tank from around the piston.

The piston also slides back until it is almost fully retracted.
•
The piston must also be pushed manually back to its normal resting position.