Philips 4605 - Manual (Page 13)

9.
14 Press down and turn the wheel clockwise until it locks
into place.
15 Replace the Razor Head Assembly back on razor.
After Each Use:Trimmer
1 Turn razor OFF by locking the switch to the “OFF” position.
2 Push Trimmer Slide Switch up to pop-up Trimmer.
3 Clean Trimmer with the brush every time you use it.
4 Lubricate the Trimmer teeth with Norelco Razor
Lubricant (model AL80), or with one drop of mineral
oil every 6 months.
5 Close Trimmer by sliding Trimmer switch down.