Stihl 034 AV Super Parts Manual

The Stihl 034 AV Super is a professional-grade chainsaw featuring anti-vibration (AV) technology, a powerful engine, and durable construction for demanding forestry and cutting applications. This parts manual provides detailed diagrams, part numbers, and ordering information for maintenance, repair, and replacement of components. Below are key sections covering safety, engine components, fuel system, ignition, cooling, drive train, guide bar, chain, and troubleshooting.

1. Safety Information & Warnings 2. Engine Assembly & Components 3. Fuel System Parts 4. Ignition System Parts 5. Cooling & Exhaust System 6. Drive Train & Clutch 7. Guide Bar & Chain Components 8. Anti-Vibration System 9. Handle & Control Parts 10. Fasteners & Hardware 11. Troubleshooting & Part Replacement

Safety Information & Warnings

Always wear protective gear: helmet, goggles, gloves, chainsaw chaps, and hearing protection. Ensure chainsaw is on stable ground before starting. Keep bystanders away. Use proper chain tension and sharp chain to prevent kickback. Disconnect spark plug before performing maintenance.

Warning	Description
Fuel Handling	Use fresh fuel mix (gasoline and 2-stroke oil); no refueling near open flames
Chain Brake	Test chain brake before each use; ensure it engages properly
Kickback Zone	Avoid contact with upper quadrant of guide bar tip
Hot Surfaces	Allow engine and muffler to cool before touching
Sharpening	Use proper file gauge; maintain correct cutting angle

Engine Assembly & Components

Cylinder, piston, crankshaft, connecting rod, bearings, seals, and crankcase parts.

Cylinder Assembly: Includes cylinder, fins, and decompression valve (if equipped).
Piston & Rings: Piston, wrist pin, circlips, and piston rings.
Crankshaft: Main shaft with integrated counterweights and bearing journals.
Crankcase: Two halves with gasket; houses crankshaft and bearings.
Bearings & Seals: Main bearings, wrist pin bearing, and crankshaft seals.

WARNING! Engine disassembly requires special tools; improper assembly can cause engine failure.

Fuel System Parts

Fuel tank, cap, lines, filter, carburetor, and primer bulb components.

Fuel Tank: Polyethylene tank with integrated filter pickup.
Carburetor: Walbro or Zama carburetor with adjustment screws (H, L, idle).
Fuel Lines: Supply and return lines; check for cracks and stiffness.
Fuel Filter: In-tank filter; replace annually or when clogged.
Primer Bulb: For cold starts; check for cracks and leaks.

CAUTION! Use only ethanol-free fuel to prevent carburetor damage.

Ignition System Parts

Ignition Module: Electronic ignition coil with spark advance.
Spark Plug: NGK BPMR7A or equivalent; gap 0.020 inch.
Stop Switch: Grounds ignition to stop engine.
Flywheel: Magneto and cooling fins; keyed to crankshaft.
Wiring Harness: Connects ignition module, switch, and spark plug.
Spark Arrestor: In muffler; clean regularly to prevent fire hazard.

Cooling & Exhaust System

Cooling fins, fan, muffler, and heat shields.

Cylinder Fins: Keep clean for proper heat dissipation. Muffler: Reduces noise and directs exhaust; includes spark arrestor screen. Heat Shields: Protect plastic components from exhaust heat.

Drive Train & Clutch

Clutch drum, springs, shoes, sprocket, and drive shaft.

Centrifugal Clutch: Engages at high RPM; includes shoes and springs.
Clutch Drum: Holds rim sprocket; check for wear and scoring.
Drive Sprocket: Rim or spur type; replace when worn.
Oil Pump: Automatic chain oiler with adjustable flow.

Tip: Replace clutch springs annually if used heavily.

Guide Bar & Chain Components

Guide bar, chain, sprocket nose, bar nuts, and tensioning system.

Guide Bar: Stihl Rollomatic E or equivalent; lengths 16" to 20".
Chain: 3/8" pitch, .050" gauge, round-chisel or semi-chisel.
Bar Nose Sprocket: Replace if worn to reduce chain wear.
Tensioner: Screw adjustment for proper chain tension.
Bar Plates: Protect saw body from bar contact.

WARNING! Always match chain pitch and gauge to bar specifications.

Anti-Vibration System

AV mounts, springs, and dampers reduce vibration to handles.

Front AV Mounts: Rubber isolators between engine and front handle. Rear AV Mounts: Springs and dampers for rear handle. Check mounts for cracks and deterioration annually.

Handle & Control Parts

Front and rear handles, throttle trigger, lockout, and master control lever.

CAUTION! Inspect handles for cracks; replace if damaged to maintain control.

Fasteners & Hardware

All screws, nuts, washers, and clips with part numbers.

Use only Stihl OEM fasteners; improper hardware can lead to failure.

Troubleshooting & Part Replacement

Symptom	Possible Cause	Corrective Action
Hard starting	Fouled spark plug, stale fuel	Replace spark plug; drain and refill with fresh fuel mix.
Loss of power	Clogged air filter, muffler screen	Clean or replace air filter; clean spark arrestor screen.
Chain won't oil	Clogged oil passages, faulty pump	Clean oil ports; check oil pump drive and replace if needed.
Excessive vibration	Worn AV mounts, unbalanced clutch	Inspect and replace AV mounts; check clutch balance.
Chain throws off bar	Worn bar, improper tension	Inspect bar rails and sprocket nose; adjust tension correctly.

Ordering Parts: Use part numbers from diagrams; contact authorized Stihl dealer.

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