Stihl MS 280 Parts Manual

The Stihl MS 280 is a professional-grade chainsaw featuring a powerful engine, advanced anti-vibration system, Quickstop® inertia chain brake, Ematic™ lubrication system, and STIHL Easy2Start™. This parts manual provides detailed diagrams, part numbers, and ordering information for all components to assist with maintenance, repair, and replacement. Below are key sections for identification, engine components, cutting equipment, fuel system, ignition, and ordering.

1. Model Identification & Specifications 2. Engine Assembly & Components 3. Fuel System Parts 4. Ignition System Parts 5. Cutting Equipment & Bar/Chain 6. Anti-Vibration System 7. Starter Assembly 8. Clutch & Sprocket 9. Crankcase & Cylinder 10. Fasteners & Hardware 11. Parts Ordering & Exploded Views

Model Identification & Specifications

Identify your model using the serial number plate. Key specifications: Engine displacement, power output, weight, guide bar lengths, chain pitch/gauge.

Feature	Description
Engine Type	2-stroke, single cylinder, air-cooled
Displacement	55.5 cm³ (3.4 cu. in.)
Power Output	3.0 kW (4.0 hp)
Weight (powerhead)	Approx. 5.6 kg (12.3 lbs)
Fuel Tank Volume	0.55 L (18.6 fl. oz)
Oil Tank Volume	0.26 L (8.8 fl. oz)
Recommended Bar Lengths	40 cm (16"), 45 cm (18")
Chain Pitch/Gauge	3/8" PM / .050" (1.3 mm)
Ignition System	Electronic, capacitor discharge (CDI)
Warranty	Refer to local STIHL warranty terms

Engine Assembly & Components

Complete breakdown of engine block and related parts.

Cylinder & Piston Assembly: Includes cylinder, piston, rings, wrist pin, circlips.
Crankshaft & Bearings: Crankshaft, main bearings, seals.
Connecting Rod: Connects piston to crankshaft.
Crankcase: Upper and lower halves, gaskets.
Muffler & Spark Arrestor: Muffler assembly, heat shield, spark arrestor screen.

WARNING! Disassemble engine only with proper tools and training. Mark parts for correct reassembly.

Fuel System Parts

Components for fuel delivery and carburetion.

Fuel Tank: Tank, cap, vent, fuel filter, fuel line.
Carburetor Assembly: Complete carburetor, adjustment screws, gaskets, throttle linkage.
Air Filter System: Air filter cover, filter element, pre-cleaner.
Impulse Line: Connects crankcase to fuel pump.
Fuel Pump Diaphragm: Part of carburetor assembly.

CAUTION! Use only STIHL-approved fuel mix (50:1). Ensure fuel lines are crack-free.

Ignition System Parts

Ignition Module (CDI): Electronic control unit.
Spark Plug: Bosch WSR6F or equivalent.
Stop Switch: On/off switch assembly.
Wiring Harness: Connects switch to module and coil.
Flywheel & Magneto: Flywheel, key, fan, ignition coil.
STIHL Easy2Start™ Components: Spring, engagement mechanism (if equipped).

Cutting Equipment & Bar/Chain

Guide bar, chain, sprocket, chain tensioner, and lubrication parts.

Guide Bar: Roller nose bar, replaceable sprocket tip. Chain: STIHL Oilomatic® saw chain, cutters, tie straps, rivets. Drive Sprocket: Rim sprocket or spur sprocket. Clutch: Centrifugal clutch assembly, springs, drum. Chain Brake: Quickstop® inertia brake band, handle, linkage. Oil Pump: Ematic™ automatic and manual oiler, pump gear, delivery line.

Anti-Vibration System

Components that reduce vibration to the operator.

Front AV Mounts: Rubber dampeners between engine and handle.
Rear AV Mounts: Dampeners at rear handle connection.
AV Springs: Additional vibration absorption.

Tip: Inspect AV mounts regularly for wear or cracking. Replace in sets.

Starter Assembly

Recoil starter components for manual starting.

Starter Housing: Plastic cover, pulley, spring, rope.
Starter Rope: Handle, knot, replacement rope.
Rewind Spring: Spring that retracts rope.
Pawl & Ratchet: Engagement mechanism for crankshaft.
Easy2Start™ Elements: Additional spring and cam (if equipped).

WARNING! Starter spring is under tension. Use proper safety procedures when servicing.

Clutch & Sprocket

Parts transmitting engine power to the chain.

Clutch Drum: Houses sprocket. Clutch Shoes: Centrifugal shoes with springs. Sprocket: Rim type (recommended) or spur. Bearing: Needle bearing inside drum. Retaining Ring: Secures drum on crankshaft.

Crankcase & Cylinder

Major engine castings and seals.

Upper Crankcase: Half containing cylinder base. Lower Crankcase: Oil sump half. Crankshaft Seals: Prevent air leaks. Gaskets & Seals: Case gasket, intake gasket, cylinder gasket. Decompression Valve: Optional component for easier starting.

Fasteners & Hardware

All screws, nuts, washers, and clips.

CAUTION! Use only STIHL genuine fasteners. Torque to specified values.

Parts Ordering & Exploded Views

Symptom / Need	Required Information	Action
Ordering a part	Part number from diagram, serial number	Contact authorized STIHL dealer with part number and serial number.
Identifying a part	Exploded view diagram, reference number	Use the numbered diagram to find the reference, then cross-reference to part list.
Part not available	Part number, dealer inquiry	Dealer can check national inventory or order from STIHL.
Assembly guidance	Exploded view, service manual	Refer to the assembly sequence in the diagram. For complex tasks, consult the service manual.
Compatibility	Serial number range, engine type	Confirm part fits your specific MS 280 model and serial number range.

Exploded Views: Diagrams are organized by assembly group (Engine, Fuel, Ignition, etc.).

Service: For technical support or to locate a dealer, visit www.stihlusa.com or call 1-800-467-8445.