G-Fittings 45.100x.090.12 Quick Start Manual page 6

Set up Hydraulic buffer. Only adjust the Hydraulic Buffer of H-S hinge
1. Only door without latch:
1.1. Remove the pink sticker.
1.2. Loose the set screws with 3 mm Allen key also on the opposite.
1.3. Turn the hydraulic buffer with 5 mm Allen key from – to + almost to the end.
(try to adjust gradually and find the ideal buffer angle for the door)
1.4. Tighten the loosened set screws.
1.5. Open the door to 90° before adjustment.
1.6. Set the power of Hydraulic buffer with 3 mm Allen key.
1.6.1. From + to -
1.6.2. From – to + faster closing speed
2. For door with latch:
2.1. Only follow the steps 1.5 & 1.6
slower closing speed