Stihl BR 550 Technical Guide - Page 2

Page 2 Technical Information 08.2005 The new STIHL BR 500, BR 550 and BR 600 backpack blowers are three ideal models for demanding, professional users. The BR 500 is especially low-noise yet highly powerful for use in noise-sensitive areas. The BR 550 has an attractive price with far aboveaverage blowing strength. The BR 600 is particularly powerful - one of the strongest blowers in the world. The STIHL 4-MIX engine of the new blowers sets benchmarks in blowing strength, economy and environmental friendliness. Comfort is increased with the simplified starting procedure. This is realised with the newly designed control handle and central control section that holds all operating elements required for starting. Another innovation is the electrostatic arrester in the blowing system that protects the user from electrostatic shock. The devices are equipped with an adjustable carrying system with breathing padding for superior wearing comfort. The holder for the blowing system makes the devices easier to transport and saves space in storage. 1. Technical description 1.1 Blowing system with electrostatic arrester The extremely high flow of air from the new blowers generates friction in the blower tubes. The friction can build up an electrostatic charge. The arrester in the blower tube creates a conductive link to the engine block to prevent the build up of electrostatic charges that can lead to sparkover. . Before starting the blower, check to see if it is intact and seated correctly. If the arrester is damaged, replace it (see 5.6). . Never operate the machine without an arrester. TI_08_2005_11_01_02.fm