Stihl 028 WB Service Manual

The Stihl 028 WB is a professional-grade chainsaw featuring a powerful engine, robust construction, and advanced safety features. This manual provides comprehensive information for maintenance, troubleshooting, and repair. Below are key sections covering safety, specifications, maintenance procedures, troubleshooting, and parts information.

1. Safety Information 2. Specifications 3. Maintenance Schedule 4. Engine Service 5. Fuel System 6. Ignition System 7. Chain & Bar Assembly 8. Clutch & Sprocket 9. Troubleshooting 10. Parts List 11. Warranty & Support

Safety Information

Always wear appropriate personal protective equipment (PPE) including safety glasses, hearing protection, gloves, and chainsaw chaps. Ensure the chainsaw is on stable ground before starting. Keep bystanders at a safe distance.

Safety FeatureDescription
Chain BrakeStops chain rotation in kickback situations
Throttle LockoutPrevents accidental throttle activation
Right-Hand GuardProtects hand from chain breakage
Anti-Vibration SystemReduces operator fatigue
MufflerReduces noise and directs exhaust away

Specifications

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

  1. Daily: Check chain tension, sharpness, and lubrication.
  2. Weekly: Clean air filter, check spark plug, inspect fuel lines.
  3. Monthly: Clean cooling fins, check clutch and sprocket wear.
  4. Annually: Replace fuel filter, inspect piston and cylinder.

WARNING! Always disconnect spark plug before performing maintenance.

Engine Service

Procedures for engine disassembly, inspection, and reassembly.

  1. Remove engine cover and muffler.
  2. Inspect piston and cylinder for scoring or wear.
  3. Check crankshaft bearings for smooth rotation.
  4. Replace cylinder base gasket during reassembly.
  5. Torque cylinder bolts to specification (10 Nm).

Note: Use genuine Stihl parts for replacement.

Fuel System

Components include fuel tank, filter, lines, and carburetor.

  1. Drain fuel before storage exceeding 30 days.
  2. Replace fuel filter every 100 operating hours.
  3. Adjust carburetor (L, H, LA screws) for optimal performance.
  4. Inspect fuel lines for cracks or leaks.

Tip: Use fresh, high-quality 2-stroke oil mixed at 50:1 ratio.

Ignition System

Electronic ignition module and spark plug.

  1. Check spark plug gap: 0.5 mm.
  2. Test ignition coil resistance: Primary 0.5-1.0 Ω, Secondary 8-12 kΩ.
  3. Ensure stop switch functions correctly.
  4. Replace spark plug every 50 operating hours.

Chain & Bar Assembly

Proper chain installation and maintenance.

  1. Install bar with tensioning pin aligned.
  2. Adjust chain tension: Should snap back when lifted.
  3. Sharpen chain regularly with round file (4.0 mm).
  4. Rotate bar periodically for even wear.
  5. Lubricate bar nose sprocket weekly.

WARNING! Always wear gloves when handling chain.

Clutch & Sprocket

Centrifugal clutch and drive sprocket maintenance.

  1. Remove clutch with special tool (Stihl 1122 890 4500).
  2. Inspect clutch shoes for wear; replace if worn by 50%.
  3. Check sprocket for wear; replace if teeth are hooked.
  4. Lubricate clutch bearing during reassembly.

Troubleshooting

SymptomPossible CauseCorrective Action
Engine won't startNo spark, fuel issue, floodedCheck spark plug, fuel lines, carburetor; clear flood.
Engine runs poorlyClogged air filter, carb adjustmentClean/replace air filter; adjust carburetor.
Chain doesn't turnClutch worn, sprocket damagedInspect clutch and sprocket; replace if necessary.
Excessive vibrationLoose components, AV mounts wornTighten bolts; replace anti-vibration mounts.
Oil not lubricatingClogged oil passages, pump failureClean oil ports; test oil pump output.

Parts List

Key replacement parts for Stihl 028 WB.

Warranty & Support

Stihl 028 WB comes with a 1-year commercial warranty. Register your product online for extended support. For technical assistance, contact authorized Stihl service centers. Always use genuine Stihl parts to maintain warranty coverage.

Support: 1-800-467-8445; www.stihlusa.com

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