# Filling Oil

1. Connect the wrench to a pump with a hose.

2. Press and release the Advance button [1] to start the pump.

   The retract side of the hydraulic cylinder is automatically filled and pushes the piston to the starting position. Air from the advance side of the piston will be forced into the hose.

3. Press the Stop button [0] to stop the pump. Then press the button on the directional control valve to depressurize the retract line.

4. Disconnect the hose and purge the air from the hose, as follows:

   - For co-axial hoses: With the wrench disconnected, start the pump and stop it again after 10 seconds. This will cause oil to circulate between the advance and retract lines and will purge the air out of the hose.

   - For screw-to-connect hoses: screw the loose ends of the hoses together to form a loop. Start the pump and stop it again after 10 seconds. This will cause oil to circulate between the advance and retract lines and will purge the air out of the hose.

5. Reconnect the hose to the wrench.

6. Advance and retract the piston 10 times.

7. Stop the pump.

8. Disconnect the hose and repeat the air purge procedure.

## Applies to: