Bolt Service Process

Position the tool on the bolt.

Pressurize to Installation check hydraulic pressure.

Do an installation check for bolt service:

1. Apply torque >20 Nm in tightening direction. Hand controller takes angle reference point in tightening direction.

2. Apply torque >20 Nm in loosening direction. Hand controller takes angle reference point in loosening direction.

   Hand controller stores the angle of the mechanical play.

While keeping the wrench and gearbox in loosening position, press and hold the pressurize button until the pressure reaches Min bolt tensioning pressure bar.

Loosen the nut to an angle greater than or equal to the bolt service parameter Nut loosening min loosening angle.

The controller UI will show the loosening angle as a negative measurement from the loosening angle reference point.

Tighten the bolt to the parameter Tightening target torque. The tightening angle is recorded.

Loosening and tightening angles refer to actual nut rotation. Hand controller compensates for mechanical play. The controller GUI will start updating the angle when the nut starts to rotate, i.e. disregarding the mechanical play. Thereby the displayed angle will reflect the nut movement, and when the angle measurement is 0, the nut is back to the original position.

The delta nut rotation in tightening direction must not be higher than parameter Max delta nut rotation with default of 13 degrees. In practice, this means that the nut must not rotate to an angle more than 13 degrees higher than the original position.

Release pressure and store result. The following conditions must be true to get OK results:

• The recorded loosening angle is greater than or equal to Nut loosening min loosening angle.

• The recorded delta angle after tightening must be in the range between Min delta nut rotation and Max delta nut rotation.

  Min delta nut rotation is equal to D in the picture Bolt service process.