Stihl 056 Service Manual

The Stihl 056 is a professional-grade chainsaw known for its power and durability. This service manual provides detailed instructions for maintenance, troubleshooting, and repair of the Stihl 056 chainsaw, including engine specifications, fuel system, ignition system, chain and bar assembly, carburetor adjustment, and safety procedures. Below are key sections covering safety, specifications, maintenance procedures, troubleshooting, and parts information.

1. Safety Precautions 2. Specifications 3. Maintenance Schedule 4. Engine Service 5. Fuel System 6. Ignition System 7. Chain & Bar Assembly 8. Carburetor Adjustment 9. Troubleshooting 10. Parts Diagram 11. Warranty & Support

Safety Precautions

Always prioritize safety when servicing the Stihl 056 chainsaw. Key safety components: Chain brake, throttle lockout, front and rear hand guards, muffler, spark arrestor.

Safety Feature	Description
Chain brake	Stops chain rotation in kickback situations
Throttle lockout	Prevents accidental throttle engagement
Front hand guard	Protects left hand from chain contact
Rear hand guard	Protects right hand from debris
Muffler	Reduces exhaust noise and directs gases away
Spark arrestor	Prevents emission of burning particles
Stop switch	Immediately stops engine operation
Chain catcher	Catches broken chain to prevent injury
Anti-vibration system	Reduces operator fatigue and vibration exposure
Right-hand guard	Additional protection for right hand

Specifications

Unpack and inspect contents. Place on stable surface.

Engine displacement: 56.5 cc (3.45 cu in).
Power output: 4.0 kW (5.4 HP).
Fuel tank capacity: 0.77 L (0.20 US gal).
Oil tank capacity: 0.36 L (0.10 US gal).
Chain pitch: 3/8" or .404".
Guide bar lengths: 16" to 36".
Weight (powerhead): 7.5 kg (16.5 lbs).
Ignition system: Electronic, breakerless.
Spark plug: Bosch WSR6F or equivalent.

WARNING! Always use genuine Stihl parts and recommended fuels/oils. Ensure chainsaw is cool before servicing.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Daily: Check chain tension, sharpness, and lubrication.
Weekly: Clean air filter, check spark plug, inspect fuel lines.
Monthly: Clean cooling fins, check anti-vibration elements.
Annually: Replace fuel filter, inspect clutch and sprocket.
As needed: Clean spark arrestor screen, replace worn parts.

CAUTION! Disconnect spark plug wire before performing any maintenance to prevent accidental starting.

Engine Service

Cylinder & Piston: Inspect for scoring; measure compression (minimum 120 psi).
Crankshaft & Bearings: Check for play and smooth rotation.
Muffler: Remove and clean carbon deposits regularly.
Cooling System: Ensure fins are clean for proper heat dissipation.
Decompression Valve: Test for proper operation if equipped.
Rewind Starter: Inspect spring and rope for wear.
Clutch: Check shoes for wear and proper engagement.
Anti-Vibration Mounts: Replace if cracked or deteriorated.

Fuel System

Access fuel system by removing tank cover. Components: Fuel tank, filter, lines, carburetor, primer bulb.

Fuel Mix: Use 50:1 gasoline to 2-cycle oil ratio (Stihl HP Ultra recommended).

Fuel Filter: Replace annually or when clogged. Fuel Lines: Inspect for cracks and replace if leaking. Carburetor: Clean jets and diaphragm; adjust H, L, and LA screws. Primer Bulb: Check for cracks and proper fuel flow.

Ignition System

Components: Flywheel, ignition module, spark plug, stop switch, wiring.

Disconnect spark plug wire before testing.
Check spark plug gap: 0.5 mm (0.020 in).
Test ignition module with multimeter (refer to resistance values).
Inspect flywheel key for shearing.
Check stop switch continuity.

Tip: Use only recommended spark plugs; improper gap can cause hard starting.

Chain & Bar Assembly

Supports various bar lengths and chain types.

Bar Installation: Align adjustment pin with hole; tighten nuts evenly.
Chain Tension: Adjust so chain pulls smoothly but doesn't sag.
Sharpening: Use correct file size (typically 5/32" or 7/32").
Sprocket: Check for wear; replace if teeth are hooked.
Lubrication: Ensure oiler port is clear and delivering oil.
Bar Maintenance: Clean groove and flip bar regularly for even wear.
Chain Brake: Test functionality; replace band if worn.
Chain Catcher: Inspect for damage and replace if necessary.

WARNING! Always wear cut-resistant gloves when handling chain. Ensure chain brake is functional before use.

Carburetor Adjustment

Adjust H (high speed), L (low speed), and LA (idle) screws. Initial settings: L - 1 turn open, H - 1 turn open, LA - 1 turn open.

Troubleshooting

Unplug before cleaning. Use dry cloth only; no liquids or aerosols.

CAUTION! Do not spray liquids; keep away from heat and moisture.

Parts Diagram

Refer to official Stihl parts diagram for component identification and ordering. Key assemblies: Engine group, fuel system group, ignition group, chain brake group, handle group. Copyright © Stihl; all parts and diagrams are proprietary. For genuine parts, contact authorized Stihl dealers or visit www.stihlusa.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	Fuel, spark, compression	Check fuel mix, spark plug, compression; clean carburetor.
Engine runs poorly	Air filter, fuel filter, carb	Clean/replace air filter; replace fuel filter; adjust carburetor.
Chain doesn't turn	Clutch, sprocket, brake	Inspect clutch shoes; check sprocket; ensure brake is disengaged.
Excessive vibration	Mounts, balance	Replace anti-vibration mounts; check crankshaft balance.
Oil not dispensing	Oiler, passages, tank	Clean oiler port; check oil lines; ensure tank vent is clear.

Reset: Adjust carburetor to factory settings if performance issues persist.

Service: Contact authorized Stihl service center; 1-800-467-8445; www.stihlusa.com