McCulloch Pro Mac 700 Chainsaw Manual

The McCulloch Pro Mac 700 is a professional-grade chainsaw featuring a powerful 70cc engine, automatic oiling system, anti-vibration handles, chain brake safety feature, and a 20-inch guide bar. Designed for heavy-duty felling, limbing, and bucking tasks. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Assembly & Preparation 3. First-Time Operation 4. Specifications 5. Controls and Components 6. Chain & Bar Maintenance 7. Engine Operation 8. Safety Features 9. Storage & Care 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: 70cc 2-stroke engine, 20-inch guide bar, automatic chain oiler, anti-vibration system, chain brake, decompression valve, primer bulb, and adjustable oil pump.

Feature	Description
Engine Displacement	70cc 2-stroke air-cooled engine
Guide Bar Length	20 inches (standard)
Chain Pitch	.404 inch or 3/8 inch (varies by model)
Automatic Oiler	Delivers oil to bar and chain during operation
Anti-Vibration System	Reduces operator fatigue
Chain Brake	Inertia-activated safety feature to stop chain
Decompression Valve	Easier starting by reducing cylinder pressure
Primer Bulb	Pre-fuels carburetor for quick starting
Adjustable Oil Pump	Controls oil flow rate to chain
Fuel Capacity	Approximately 24 oz (710 ml)

Assembly & Preparation

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

Attach guide bar and chain: Place bar on studs, align chain, adjust tension.
Fill fuel tank: Use fresh 50:1 gas/oil mix (89 octane minimum).
Fill chain oil tank: Use quality bar and chain oil.
Check controls: Ensure throttle trigger, choke, and stop switch function properly.

WARNING! Always wear protective gear: gloves, eye protection, hearing protection, chainsaw chaps, and steel-toe boots.

First-Time Operation

Start the chainsaw on the ground, firmly holding the rear handle.

Set chain brake to ON (forward position).
Press primer bulb 5-6 times until fuel is visible.
Set choke to FULL position.
Pull starter rope briskly until engine fires (1-3 pulls).
Move choke to HALF position, pull until engine starts.
Allow to warm up 30 seconds, then release chain brake.
Test throttle response before cutting.

CAUTION! Never drop-start or start above waist height. Keep bystanders at least 15 feet away.

Specifications

Engine: 70cc 2-stroke, air-cooled.
Power Output: Approximately 5.5 HP.
Fuel Mix: 50:1 (unleaded gasoline to 2-cycle oil).
Bar Length: 20 inches (optional 16"-24").
Chain Speed: Up to 65 ft/sec at max RPM.
Idle Speed: 2,800 - 3,200 RPM.
Max RPM: 12,500 - 13,500 (no load).
Weight: 15.8 lbs (without bar and chain).
Sound Level: 105 dB(A) at operator's ear.
Vibration Level: Front handle: 4.5 m/s²; Rear handle: 5.2 m/s².

Controls and Components

Main controls located on top and rear handle.

Top Handle: Choke lever, primer bulb, decompression valve (if equipped). Rear Handle: Throttle trigger, throttle lockout, stop switch, chain brake lever.

Adjustments: Chain tension (side knob), oil pump (screw under clutch cover), carburetor (H, L, LA screws). Maintenance points: Air filter (snap-off cover), spark plug (reach through housing), fuel filter (inside tank).

Chain & Bar Maintenance

Regular maintenance ensures optimal cutting and safety.

Chain tension: Adjust when chain sags from bar rails. Should snap back when pulled.
Sharpening: Use round file matching chain pitch (typically 7/32" for .404"). Maintain 30° top plate angle.
Bar care: Clean bar grooves weekly, flip bar monthly for even wear.
Oiler check: Run saw at high RPM pointed at light surface; oil line should appear.

Tip: Always disconnect spark plug wire before performing chain maintenance.

Engine Operation

Proper operation extends engine life.

Warm up: Run at idle 30 seconds before cutting.
Cutting technique: Use full throttle during cuts; avoid "riding" the chain.
Fuel management: Shut off fuel valve if storing >30 minutes.
Carb adjustment: H screw (high speed) - set for smooth acceleration; L screw (low speed) - set for stable idle; LA screw (idle) - adjust to prevent chain creep.
Air filter: Clean weekly with soapy water, dry completely.
Spark plug: Replace annually or every 100 hours; gap at .025".

WARNING! Never operate without proper chain lubrication. Engine damage will occur.

Safety Features

Chain Brake: Inertia-activated; manual engagement via front hand guard. Throttle Lockout: Must be depressed before throttle trigger engages. Right-Hand Guard: Protects from kickback. Anti-Vibration: Rubber mounts reduce fatigue. Decompression Valve: Reduces pulling effort by 40%.

Storage & Care

For storage >30 days: Drain fuel tank, run carburetor dry, remove chain and clean, store in dry place.

CAUTION! Fuel left in tank will gum carburetor. Use fuel stabilizer if storing <30 days.

Regulatory Information

EPA Phase II certified. Meets ANSI B175.1 safety standards. CARB compliant (California). Contains FCC Part 15 Subpart B compliant ignition system. Copyright © McCulloch Corporation. For support, visit www.mcculloch.com or contact 1-800-521-2803.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	Old fuel, flooded, no spark	Use fresh mix; wait if flooded; check spark plug gap and wire.
Engine starts then dies	Clogged fuel filter, air leak	Replace fuel filter; check fuel lines and carburetor gaskets.
Chain doesn't oil	Empty oil tank, clogged port	Fill tank; clean oil holes in bar; check pump adjustment.
Excessive vibration	Loose parts, unbalanced chain	Tighten all bolts; sharpen chain evenly; check clutch balance.
Chain won't stop moving	Idle too high, clutch stuck	Adjust LA screw; clean clutch drum and springs.
Loss of power	Dirty air filter, exhaust screen	Clean air filter; remove and clean spark arrestor screen.

Reset: For electronic ignition models, disconnect spark plug wire for 30 seconds to reset module.

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