Shaping the reaction bar

WARNING

Crushing Hazard

Check the rotational direction of the tool before start! A start in an unexpected rotational direction can cause bodily injury or property damage.

Make sure that the rotational direction of the tool is correct before starting the tool.
Keep your hands away from the reaction bar while using the tool.

The torque reaction bar must be shaped to fit a suitable fixed support. To avoid overloading of the bearings for the tool drive and of the reaction bar, the point of contact on the reaction bar should be within the shaded area (F), see Fig. A.

Adapt and use the torque reaction bar as follows:

Measure the distance (L) for the hexagon sleeve to be used. Mark out points (A and B) on a sheet of paper.
Consult Table No.1 to find the angle (α) applicable to the diameter (D) of the machine and the tightening torque in question. Draw a line from point (A) in angle (α) from the centre line (A – C).
Draw a line (B – E) at right angles (90^o to the centre line (A – C) of the machine from point (B). Starting at point (B), draw two lines at angles of +15^o and -15^o respectively from the marked 90^o-line.
Mark the area (F) between the drawn lines.
Adapt the shape of the reaction bar so that the point of contact (K) falls within the marked area (F). The minimum breaking force is obtained if the point of contact (K) is on or close to line (B – E).

If the point of contact falls within angle (α) – in area (G) – there is a risk of overloading of the bearings for the machine drive and deformation of the reaction bar.

If the point of contact is outside angles ± 15^o – in areas (H) – there is a risk of rapid wear of the hexagon sleeve and reduced torque accuracy.

Bending the reaction bar, Fig B

It is recommended to concentrate the heat to the inside radius in order not to reduce the original width (W), see fig. B.

Heat the spot to red colour.
After bending, allow to cool slightly in room temperature and then chill.
In order for the torque reaction bar to be as light as possible it is recommended that the section outside the bend be configured as shown in Fig. B.

After bending, attach the accompanying warning sign to the reaction bar, see fig. C, and mark the side of the reaction bar that should be placed against the support in a suitable way.

Assembling the reaction bar

Place the reaction bar in the wanted position on the machine.
Tighten the nut to a torque of 70 Nm, 90 Nm or 100 Nm respectively, in accordance with the specification on the exploded views.
Check regularly that the lock ring is firmly secured.

Using the reaction bar

Apply the reaction bar according to figure C – opposite the direction of the drive of the machine – before starting the machine.
Never put your hand on or close to the reaction bar while the machine is being used.