# Tightening

1. Put the tool on the fastener to be tightened. Push the tool towards the reaction surface until the reaction arm contacts with a suitable reaction point.

   - The reaction structure must be rigid enough to withstand the reaction force from the hydraulic tool.

   - Avoid tapered surfaces as the reaction arm could slide, causing adverse loading and tool instability.

   - Do not use loose spacers to create a reaction structure. If the standard reaction arm is not suitable, contact Atlas Copco for advice.

2. Press and release the Advance button [1] on the remote control pendant to start the pump.

3. Support the tool with the support handle and make sure of the following:

   - The ratchet link is fully engaged with the fastener being tightened.

   - The reaction arm is firmly against the reaction structure.

   - The hose and couplings are free to move, clear of surrounding structures.

   Be aware that when the tool is retracting, you must support the weight of the tool; especially on inverted applications. If the tool is not supported, it can fall from the application.

4. Press and hold the Advance button [1] so that the drive rotates.

   When the piston reaches the end of the stroke, the following happens:

   - The reaction pawl makes a click sound.

   - The ratchet link stops turning.

   - The pressure builds up to the set pressure value.

     This does not mean that the bolt is tightened correctly, it only indicates that the tool is at full stroke.

5. When the tool reaches full stroke, support the tool and release the Advance button [1] on the remote control pendant. The tool automatically retracts. When the tool is fully retracted, the drive pawl clicks.

6. The tool is now ready to advance again. Repeat steps 3–5 until the pressure builds directly to the target value and no movement of the fastener is observed. The wrench has stalled and the fastener is tightened correctly.

7. Once the tool has stalled, press the Advance button [1] once more to make sure that the fastener is not moving. If not, the tightening process is complete.

8. Occasionally, the tool can lock itself on the application. To remove the tool do the following:

   1. Press and hold the Advance button [1].

   2. Once the pressure reaches the target value, push the pawl levers by hand to disengage the pawl from the ratchet.

   3. Support the weight of the tool before releasing the Advance button on the remote control pendant.

   4. Remove the tool from the application.

   Move the pawl levers by hand. Do not use tools to move the levers.

9. Press the Stop button [0] on the remote control pendant to stop the pump.

Tightening
Push the pawl lever by hand if the tool is locked on the appliance.

## Applies to: