Earthquake Chainsaw Repair Manual

The Earthquake Chainsaw Repair Manual provides comprehensive guidance for maintaining, troubleshooting, and repairing Earthquake brand chainsaws. This manual covers safety precautions, common issues, step-by-step repair procedures, parts identification, and maintenance schedules to ensure optimal performance and longevity of your chainsaw. Below are key sections for safety, features, disassembly, repair, maintenance, and troubleshooting.

Safety Precautions

Always prioritize safety when performing repairs. Key safety measures: wear protective gear, work in well-ventilated area, disconnect spark plug, secure chainsaw, and use proper tools.

Tools & Equipment Required

Basic and specialized tools needed for repairs.

1. Screwdrivers: Phillips and flathead sets.
2. Wrenches: Combination wrenches (metric/SAE).
3. Socket set: With extensions and ratchet.
4. Pliers: Needle-nose, slip-joint, and locking.
5. Torque wrench: For proper bolt tightening.
6. Compression tester: For engine diagnostics.
7. Spark plug wrench: Specific to chainsaw plug.
8. Chain sharpening kit: File, guide, and depth gauge.
9. Cleaning supplies: Brush, solvent, rags.

WARNING! Use proper tools to avoid damage to components and personal injury.

Parts Identification

Key components of Earthquake chainsaw.

1. Engine: 2-stroke gasoline engine with carburetor.
2. Chain & Bar: Cutting assembly with drive sprocket.
3. Ignition System: Spark plug, coil, and wiring.
4. Fuel System: Tank, filter, lines, and carburetor.
5. Air Filter: Prevents debris from entering engine.
6. Clutch & Drum: Engages chain when throttle applied.
7. Oil Pump: Automatic chain lubrication system.
8. Handle & Controls: Throttle, choke, and safety trigger.
9. Starter Assembly: Recoil starter mechanism.
10. Muffler: Exhaust noise reduction.

CAUTION! Identify parts correctly before disassembly to ensure proper reassembly.

Specifications

• Engine Type: 2-stroke, air-cooled.
• Displacement: Varies by model (typically 42cc-62cc).
• Power Output: 2.5-4.5 HP depending on model.
• Fuel: Gasoline with 2-stroke oil mix (ratio 50:1).
• Bar Length: 16-20 inches standard.
• Chain Pitch: 3/8" or .325" depending on model.
• Weight: 10-15 lbs (without fuel).
• Ignition: Electronic CDI system.
• Oil Capacity: Chain oil tank: 8-10 oz.
• Sound Level: Approximately 105 dB at operator position.

Common Issues & Symptoms

Typical problems encountered with Earthquake chainsaws.

Starting Issues: Won't start, hard starting, starts then dies. Performance Problems: Loss of power, bogging down, overheating. Chain Issues: Chain won't turn, slips off bar, dull quickly. Oil System: Chain not oiling, excessive oil consumption. Vibration: Excessive vibration during operation.

Engine Repair Procedures

Step-by-step engine repair instructions.

1. Compression Test: Check engine compression (should be 120-150 psi).
2. Spark Plug: Remove, inspect, clean, gap (0.025"), or replace.
3. Cylinder & Piston: Inspect for scoring; measure ring gap.
4. Crankcase: Check for air leaks with pressure test.
5. Fuel System: Clean tank, replace filter, check lines.
6. Carburetor: Disassemble, clean jets, adjust settings.
7. Air Filter: Clean with soap/water or replace if damaged.
8. Muffler: Remove and clean carbon deposits.
9. Reassembly: Apply proper torque to all fasteners.

Tip: Take photos during disassembly to aid reassembly.

Chain & Bar Maintenance

Proper chain and bar care procedures.

1. Chain Sharpening: Use correct file size; maintain proper angle (30°).
2. Depth Gauge: File rakers to proper height (0.025" below cutters).
3. Bar Inspection: Check for wear, straightness, and groove condition.
4. Bar Flipping: Regularly flip bar for even wear.
5. Chain Tension: Adjust to proper tension (snug but movable by hand).
6. Sprocket Inspection: Check drive sprocket for wear; replace if needed.
7. Lubrication: Ensure oil port clear; use proper bar and chain oil.
8. Cleaning: Remove debris from bar groove and oil holes.

WARNING! Always wear gloves when handling chain; edges are extremely sharp.

Carburetor Adjustment

Adjusting H, L, and idle screws for optimal performance.

1. Initial Settings: Turn H and L screws clockwise until lightly seated, then back out 1.5 turns.
2. Warm Up: Start engine and let run for 5 minutes.
3. Idle Adjustment: Adjust idle screw until chain just stops moving.
4. Low Speed (L): Adjust for smooth acceleration from idle.
5. High Speed (H): Adjust for maximum RPM without overspeed.
6. Final Check: Test acceleration and idle stability.

CAUTION! Make small adjustments (1/8 turn at a time); use tachometer if available.

Electrical System

Diagnosis and repair of ignition system.

Spark Test: Remove plug, ground to cylinder, pull starter to check spark. Ignition Coil: Test resistance (primary: 0.5-2Ω, secondary: 5-15kΩ). Wiring: Check for breaks, shorts, or loose connections. Switch: Test continuity of on/off switch. Flywheel: Check keyway and magnets; clean contact surfaces.

Maintenance Schedule

Regular maintenance intervals for optimal performance.

Note: Adjust schedule based on usage intensity and conditions.

Troubleshooting Guide

Reset: For electronic issues, disconnect spark plug for 5 minutes to reset system.

Service: For complex repairs, contact authorized Earthquake service center at 1-800-XXX-XXXX or visit www.earthquakepower.com