Stihl 034 Parts Manual

The Stihl 034 is a professional-grade chainsaw known for its durability and performance. This parts manual provides detailed information on all components, assemblies, and replacement parts for the Stihl 034 chainsaw, including the 034 AV and 034 Super models. It is intended for professional technicians and experienced users to assist with maintenance, repair, and part identification. Below are key sections covering specifications, major assemblies, part numbers, ordering information, and maintenance guidelines.

1. Introduction & Safety 2. General Specifications 3. Engine Assembly & Components 4. Fuel System Parts 5. Ignition System Parts 6. Cylinder & Piston Assembly 7. Clutch & Drive System 8. Guide Bar & Chain Components 9. Crankcase & AV System 10. Covers & Housing Parts 11. Part Number Reference & Ordering

Introduction & Safety

This manual is for reference only. Always follow Stihl's official service instructions. Use genuine Stihl parts to ensure safety, performance, and warranty compliance.

Warning Symbol	Meaning
⚠️	Indicates a potential hazard that could result in injury or damage if ignored.
🔧	Special tool or technician skill required.
📋	Refer to official service manual for detailed procedures.

WARNING! Disconnect spark plug before any repair. Use proper safety equipment. Only trained personnel should perform major repairs.

General Specifications

Model Series: Stihl 034, 034 AV, 034 Super.
Engine Type: Two-stroke, single-cylinder, air-cooled.
Displacement: 34.0 cm³ (approx. 2.07 cu in).
Power Output: Varies by model; approx. 2.2 kW (3.0 hp).
Fuel/Oil Mix: 50:1 (Stihl HP Ultra or equivalent).
Ignition: Electronic, breakerless.
Bar Length Range: 40 cm (16") to 50 cm (20") recommended.
Chain Pitch: 3/8" PM or .325".
Weight (Powerhead): Approx. 5.2 kg (11.5 lbs) without bar/chain.

Engine Assembly & Components

Major engine components and their part numbers.

Crankcase Assembly: Includes halves, screws, bearings.
Crankshaft: Part # 1115 030 1200 (034 Standard).
Connecting Rod: Part # 1115 030 1300.
Bearings: Main bearings (6202 C3), needle bearing for connecting rod.
Seals: Crankshaft seals (front and rear).
Engine Mounts: AV buffer elements (for 034 AV).

Note: Torque specifications must be followed during assembly.

Fuel System Parts

Fuel Tank: Part # 1115 350 0600.
Carburetor: Typically Zama C1M or Walbro HDA series. Kit includes diaphragm, gaskets, needles.
Fuel Filter: In-tank filter, part # 0000 350 3501.
Fuel Lines: Supply and return lines, internal diameter 3.2mm.
Impulse Line: Connects crankcase to carburetor pump.
Air Filter: Foam element, part # 0000 350 4101.

Tip: Replace fuel lines annually to prevent cracking and air leaks.

Ignition System Parts

Electronic ignition module, spark plug, stop switch, wiring.

Component	Part Number	Notes
Ignition Module (Coil)	1115 400 1300	Includes spark advance.
Spark Plug	Bosom WSR6F or equivalent	Gap 0.5 mm (0.020").
Stop Switch	1115 350 7600	Integrated into wiring harness.
Flywheel	1115 400 1205	With magnets and fan blades.
Wiring Harness	1115 350 7500	Connects coil, switch, ground.

Cylinder & Piston Assembly

Critical components for engine compression.

Cylinder: Part # 1115 020 0600 (standard bore).
Piston: Part # 1115 030 0500 (with rings).
Piston Rings: Part # 1115 030 0700 (set of 2).
Wrist Pin: Part # 1115 030 0800.
Cylinder Gasket: Part # 1115 141 0800.
Decompression Valve (if equipped): Part # 1115 141 0900.

CAUTION! Measure cylinder wear and piston clearance before replacement.

Clutch & Drive System

Components transmitting engine power to the chain.

Clutch Drum: Part # 1115 160 2001.
Clutch Shoes & Springs: Part # 1115 160 2103 (assembly).
Drive Sprocket: Rim sprocket, part # 1115 160 2500 (for 3/8" pitch).
Oil Pump: Automatic chain oiler, part # 1115 350 0800.
Oil Lines: From tank to pump and bar pad.
Clutch Cover (Brake Band): Part # 1115 790 0600.

Guide Bar & Chain Components

Cutting attachment parts.

Item	Specification	Part Number Example
Guide Bar	40cm (16"), .325" pitch, 1.3mm gauge	3003 000 4316
Saw Chain	.325" pitch, 1.3mm gauge, 56 drive links	3635 005 4056
Bar Nuts	M8 x 1.25	9006 712 0825
Chain Tensioner	Manual adjust, screw and pin	1115 160 3100
Bar Plate (Spacer)	Between bar and crankcase	1115 791 0400

Crankcase & AV System

Anti-Vibration (AV) elements and crankcase hardware.

AV Buffer (Front): Part # 1115 790 0801.
AV Buffer (Rear): Part # 1115 790 0802.
Crankcase Screws: M5 x 45mm, part # 9006 712 0545.
Crankcase Gasket: Part # 1115 141 0700.
Intake Manifold: Part # 1115 141 0500.

Note: Replace AV buffers if cracked or hardened to maintain vibration damping.

Covers & Housing Parts

External covers, handles, and controls.

Top Cover (Muffler Side): Part # 1115 791 0500.
Starter Housing: Part # 1115 791 0600.
Rear Handle with Trigger: Part # 1115 791 0700.
Front Handle: Part # 1115 791 0800.
Muffler: Part # 1115 140 0601.
Muffler Gasket: Part # 1115 141 0600.
Chain Brake Handle: Part # 1115 790 0700.

Part Number Reference & Ordering

How to identify and order genuine Stihl parts.

Locate the 10-digit Stihl part number from diagrams or this manual.
Contact an authorized Stihl dealer with the part number and saw serial number.
Verify part compatibility with your specific model (034, 034 AV, 034 Super).
Refer to the official Stihl IPL (Illustrated Parts List) for exploded views.

Support: For technical assistance or to find a dealer, visit www.stihlusa.com or call 1-800-467-8445.

Common Issue	Likely Part Needed	Quick Check
Won't start, no spark	Ignition module, spark plug	Check spark with tester.
Loss of power, poor compression	Piston rings, cylinder	Perform compression test.
Chain oil not flowing	Oil pump, oil lines	Check for clogged lines.
Excessive vibration	AV buffer elements	Inspect buffers for wear.