McCulloch MAC 7 40 Chainsaw Manual

The McCulloch MAC 7 40 is a professional-grade chainsaw designed for demanding cutting tasks, featuring a powerful 40cc 2-stroke engine, 16-inch Oregon bar and chain, automatic oiler, anti-vibration system, quick-start technology, chain brake for safety, and a durable magnesium crankcase. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 40cc 2-stroke engine, 16-inch Oregon bar and chain, automatic chain oiler, anti-vibration handles, side-access chain tensioner, inertia-activated chain brake, decompression valve, and quick-start system.

Safety Information

Read all instructions before operation. Always wear appropriate PPE.

1. Personal Protective Equipment: Wear safety glasses, hearing protection, gloves, chainsaw chaps, and steel-toed boots.
2. Work Area Safety: Clear area of debris, ensure secure footing, maintain safe distance from others.
3. Kickback Prevention: Hold saw firmly with both hands, avoid tip contact, use reduced-kickback chain.
4. Fuel Safety: Mix fuel outdoors, use proper 50:1 gas/oil ratio, store fuel in approved containers.

WARNING! Chainsaws are dangerous tools. Never operate when tired, under influence, or in poor weather conditions. Keep bystanders at least 15 feet away.

Assembly & First-Time Setup

Unpack and inspect all components. Assemble on a clean, flat surface.

1. Attach guide bar and chain: Place bar on mounting studs, loop chain over sprocket, adjust tension.
2. Fill oil reservoir: Use McCulloch bar and chain oil or equivalent.
3. Prepare fuel mixture: Use 89+ octane gasoline with McCulloch 2-cycle oil at 50:1 ratio.
4. Prime and start: Press primer bulb 5-10 times, set choke, pull starter cord firmly.

CAUTION! Ensure chain brake is engaged during assembly. Keep hands away from sharp chain.

Specifications

• Engine: 40cc 2-stroke, air-cooled.
• Power Output: 2.2 HP at 9,500 RPM.
• Bar Length: 16 inches (40 cm).
• Chain Speed: 55.8 ft/s (17 m/s) at max RPM.
• Weight: 10.8 lbs (4.9 kg) without bar and chain.
• Fuel Mix Ratio: 50:1 (gasoline to 2-cycle oil).
• Sound Pressure Level: 112 dB(A) at operator's ear.
• Vibration Level: Front handle: 4.5 m/s², Rear handle: 5.2 m/s².
• Warranty: 2-year consumer warranty.

Controls and Components

Main Controls: Throttle trigger, throttle trigger lockout, stop switch, choke control, primer bulb, chain brake lever, decompression valve.

Components: Front handle with chain brake, rear handle with throttle, muffler, spark plug, air filter cover, side-access chain tensioner, fuel cap, oil cap, starter grip.

Operation: Pull choke for cold starts, push choke to run position after engine fires. Engage chain brake by pushing lever forward. Use decompression valve to reduce starting effort. Adjust chain tension via side knob when saw is cool and chain is loose.

Operation Guide

Starting Procedure: Engage chain brake, set choke, press primer, pull starter cord until engine fires, push choke to run, pull again to start.

1. Pre-cut Inspection: Check chain tension, fuel/oil levels, bar nuts tightness.
2. Cutting Techniques: Use lower part of bar for cutting, let saw do the work, avoid pinching.
3. Refueling: Stop engine completely, allow to cool, clean area around fuel cap.
4. Shutdown: Allow engine to idle for 30 seconds, press stop switch.

Tip: Keep chain sharp and properly tensioned for optimal performance and safety.

Maintenance Schedule

Daily/Before Use: Check chain tension, sharpness, and lubrication; inspect bar for wear; check air filter; verify all fasteners are tight.

1. Every 10 Hours: Clean air filter, check spark plug, clean cooling fins.
2. Every 20 Hours: Clean spark arrestor screen, inspect fuel filter.
3. Every 50 Hours: Replace spark plug, clean carburetor air intake.
4. Seasonal: Replace fuel filter, inspect anti-vibration mounts, check clutch drum.

WARNING! Always disconnect spark plug wire before performing maintenance. Use only McCulloch-approved parts.

Chain Sharpening & Tensioning

Chain Tension: Adjust when chain is cool. Proper tension allows chain to snap back when pulled from bar.

Sharpening: Use round file matching chain pitch (5/32" for .325 chain). Maintain 30° filing angle. File all cutters to equal length. Check depth gauges with gauge tool.

Storage Guidelines

Long-term Storage: Empty fuel tank, run engine until it stops. Remove chain, clean and oil it. Store in dry place away from moisture.

CAUTION! Never store with fuel in tank for more than 30 days. Use fuel stabilizer if storing with fuel.

Warranty Information

McCulloch MAC 7 40 includes 2-year consumer warranty covering defects in materials and workmanship. Warranty does not cover normal wear, misuse, improper maintenance, or use of non-genuine parts. For warranty claims, contact authorized service center with proof of purchase. For support, visit www.mcculloch.com or contact 1-800-521-2803.

Troubleshooting

Service: 1-800-521-2803; www.mcculloch.com