How to adjust gear hub of a bicycle SACHS PECTRO S7 hub gear bike service setup DIY

A hub gear, internal-gear hub, or just gear hub is a gear ratio changing system commonly used on bicycles that is implemented with planetary or epicyclic gears. The gears and lubricants are sealed within the shell of the hub gear, in contrast with derailleur gears where the gears and mechanism are exposed to the elements. Changing the gear ratio was traditionally accomplished by a shift lever connected to the hub with a Bowden cable, and twist-grip style shifters have become common.

Hub gear systems generally have a long and largely maintenance-free life though some are not suitable for high-stress use in competitions or hilly, off-road conditions. Many commuter or urban cycles such as European city bikes are now commonly fitted with 7-speed gear-hubs and 8-speed systems are becoming increasingly available. Older or less costly utility bicycles often use 3-speed gear-hubs, such as in bicycle sharing systems. Many folding bicycles use 3-speed gear-hubs. Modern developments with up to 14 gear ratios are available.

(Source Wikipedia)

[kosisok]

Thank you so much. You’ve showed me what exactly I needed!!

[arunthathivenkatachalam]

What may be the reason if hub red line doesn't lock fully and pressure is more if try to lock?

[jehanjayawardana]

Why align it in gear 4? Any reason for that?

[wujekskiba]

do you know what might be a reason when blocking on gear 7 and do not want to go down ?

[aguafria]

My hub is not changing gears, even though the triangles are aligned, and makes a ticking noise in some gears. Any idea what is wrong?