Stihl Mist Blower SR 320, SR 400, BR 340, BR 420 Service Manual • Publication No. 0455 373 0123, 2001-09 edition

Inside the Stihl BR 320, BR 400, SR 320, and SR 400 Service Manual

• Official factory publication covering the Stihl BR/SR 320 and 400 series blowers and mistblowers (2001-09 edition).
• Features 47 exploded-view diagrams and 18 technical troubleshooting flow charts.
• Instant digital download provided immediately upon checkout.
• Fully indexed and searchable PDF for fast workshop reference.

Component and Assembly Documentation

This 76-page manual serves as the master reference for the 2001 production run. It thoroughly documents the transition from early models utilizing spacer washers to later units with modified crankcase mounting bosses.

Inside, you will find extensive documentation detailing the parameters for complete engine overhauls. The text maps out reference data for piston and cylinder removal, crankcase sealing procedures, and ignition system calibration. Mechanics can quickly look up internal engine architecture, including two-part crankshaft assemblies and needle cage bearing specifications. Need the factory tolerances for adjusting carburetors or testing crankcase airtightness? The guide outlines exact vacuum and pressure testing requirements alongside rewind starter component diagrams.

Technical Specification Highlights

Precise reference values are crucial for daily workshop routines. Engine displacement is mapped out clearly: 44.9 cm³ for the 320/340 models and 56.5 cm³ for the 400/420 series.

You get exact torque values for critical fasteners, highlighting specs like the 25 Nm requirement for the flywheel nut. Electrical system tables list the ignition module coil resistance at 0.8–1.3 ohms for primary circuits. For spraying attachments, detailed fluid flow rates span from 0.25 l/min up to 3.6 l/min depending on the metering knob position.

Working on high-RPM outdoor power equipment requires strict adherence to industry safety standards. Always rely on these documented factory specifications and ensure a qualified technician verifies all system tolerances during hands-on maintenance to prevent equipment failure or personal injury.