Shaver is getting very loud - Braun 8585 Electric Shaver

You will find a video for disassembly of the shaver at shaveroutlet.com. See link below

http://www.shaveroutlet.com/braun_syncro_shaver_disassembly

However, I seriously doubt that tightening anything is the problem. More that likely, the oscillator inside the swivel frame is cracked and causing the sound. You will probably need to replace the drive unit. See link below

http://shaveroutlet.com/shaver-replacement-parts/braun-7000-series-syncro-motor-drive-unit-p-110.html

These trimmers can break internally and require replacement. You will find the replcement for model 8585 at shaveroutlet.com. See link below

http://shaveroutlet.com/shaver-replacement-parts/braun-activator-body-housing-with-trimmer-select-models-p-829.html

For installation, you will find a helpful video at the link below

http://www.shaveroutlet.com/braun_syncro_shaver_disassembly

It sounds like there is a poor connection which is causing the variable speed that you describe. The poor connection may be in the connection(s) for the new motor but may also be on the switch plate

Has the shaver gotten excessively noisy? With a loud buzzing noise?

Most likely, the noise is caused by vibration of a broken piece of plastic in the swivel fframe. If this is the case, the part required to fix it for model 8585 can be found at shaveroutlet.com. See link below

http://shaveroutlet.com/shaver-replacement-parts/braun-8000-series-activator-motor-drive-unit-p-36.html

You will also find an instructional video for disassembly at the link below

http://www.shaveroutlet.com/braun_syncro_shaver_disassembly

You can call for a Braun service center at 847-869-7755

You will find the replacement at shaveroutlet.com. See link below.

http://shaveroutlet.com/braun-7000-series-syncro-motor-drive-unit-p-110.html

To open the shaver body, you will first need to gently pry off the 'cap' on the bottom that surrounds the hole where the cord plugs in. Once removed the side grips will pull off revealing 4 screws. Remove screws to take off back cover and access insides. Inner parts simply lift out.

Your shaver came with a 2 year manufacturer warranty. Follow the warranty istructions in the user manual that came with the shaver or call Braun at 1-800-272-8611

GET MONEY MONKEY DAT IT

Replace the drive unit yourself it is easy
Buy the drive unit $25:
http://shaveroutlet.com/braun-other-parts-c-4_27.html
Open the shaver:
1) Use a small flat screw driver pry off the bottom (where the cord plugs in)
2) Remove the silver sides
3) Using a small torq driver remove the 4 scews
4) Open shaver
5) Remove circuit board with batteries
6) Remove and replace drive unit
7) Reasemble