Mark TB0015 Livret Technique page 3

Operating instructions
Mark hydraulic pipe bending machines
ASSEMBLING
1.a. 11/4", 2" and 3" machines. Place the bending frame with its supports on the floor and slip the
ring over the front of the pump cylinder. Place the U-bracket through the holes in the
ring block of the bending frame. The pump cylinder and pipe bending frame are now fixed in the
correct position.
1.b. 4" machine.
– Place the base beam on the floor.
– Place the lower wing on the base beam.
– Place the bending-pump on the base beam, hook the lower wing into the pump and secure the
pump at the rear with two M10 bolts.
– Place the corner-supports and where applicable the bending-former that you will be using, on
the lower wing.
– Place the upper wing on the cornersupports and hook into the pump
– Insert the fixing-pins through the wings and the corner-supports.
2. Mount a bending former according to the diameter of the pipe to be bent, on the ram top. The
corner supports must be placed between, or on the bending frame. They are fastened by means of
the fixing-pins. The holes in the frame allow the corner supports to be adjusted to the desired
outside diameters. These holes are marked accordingly. Ensure that the fixing pins for corner
supports are properly fitted through both wings or through the bending frame to prevent
damage.
BENDING
1. The filling cap is pierced for air release. Whenever the bending machine is transported this
filling cap must be tightly closed, but released a little when in use.
2. Before bending, the pipe should be slightly greased. The pipe is then slipped between the corner
supports and bending former. The relief spindle must be locked tightly. By moving the handle up
and down the pump is put into operation. The ram moves out and the pipe is bent. The bending
operation should be continued until the desired curve is reached but not further than the bending
forner curve. It should be remembered that the pipe will spring back a little according to the
quality of the pipe. This must be established by experience.
3. As soon as the pipe has reached its required shape, loosen the relief spindle and the ram
withdraws automatically. Disconnect one of the corner supports and the pipe can be removed.
The models equipped with an open frame have the advantage that the bent tube can be removed
easier, especially long pieces of tubes with several bends, thus saving a lot of time.
4. If a bend has been bent too far this can be corrected by means of the straightener. The ram
must be reserved and the tube turned over against the corner supports. The straightener is placed
on the ram top and the bend can now be pushed back to its desired shape. On the 11/4" bending
machine a bend of 90o cannot normally be corrected. This also applies to the 3" machine for
21/2" and 3", for the 4" machine for 3" and 4" pipes.
EN
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