Partner 370 Chainsaw Manual

The Partner 370 is a professional-grade chainsaw designed for demanding forestry and cutting applications. It features a powerful 2-stroke engine, automatic chain oiling, anti-vibration system, safety chain brake, and ergonomic design for extended use. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 2-stroke engine, guide bar, cutting chain, automatic oil pump, chain brake, throttle trigger, choke control, fuel tank, oil tank.

Feature	Description
Engine Type	2-stroke, air-cooled gasoline engine
Displacement	37cc (varies by model)
Guide Bar Length	Typically 13-16 inches
Chain Pitch/Gauge	.325" pitch, .058" gauge (common)
Automatic Oiling	Adjustable chain lubrication system
Chain Brake	Inertia-activated safety brake
Anti-Vibration	Reduced vibration handles
Fuel Capacity	Approx. 0.5 liter
Oil Capacity	Approx. 0.25 liter
Weight (dry)	Approx. 4.5 kg (10 lbs)

Safety Information

Read all instructions before operation. Wear proper PPE.

1. Personal Protective Equipment: Always wear safety glasses, hearing protection, gloves, chainsaw chaps, and sturdy boots.
2. Work Area Safety: Clear area of obstacles, ensure secure footing, keep bystanders away.
3. Kickback Prevention: Hold saw firmly with both hands, avoid tip contact, use reduced-kickback chain.
4. Chain Brake: Test brake before each use; understand inertia activation.

WARNING! Chainsaws are dangerous tools. Failure to follow safety instructions can result in serious injury or death. Never operate when tired or under influence.

Assembly & Preparation

Unpack and inspect contents. Assemble guide bar and chain.

1. Attach Guide Bar: Remove side cover, position bar over studs, align chain tensioning pin.
2. Install Chain: Place chain over sprocket and bar, ensure cutting teeth face forward on top.
3. Tension Chain: Adjust tension screw until chain snaps back when pulled from bar.
4. Fill Fluids: Use fresh fuel mix (50:1 gasoline to 2-stroke oil). Fill chain oil tank with bar & chain oil.

CAUTION! Ensure chain is properly tensioned. Loose chain can derail; overtightened chain can damage bar or break.

Specifications

• Engine: 2-stroke, single cylinder, air-cooled.
• Displacement: 37 cm³ (2.26 cu in).
• Power Output: Approximately 1.8 kW (2.4 hp).
• Fuel: Unleaded gasoline mixed with 2-stroke oil (50:1 ratio).
• Ignition: Electronic, capacitor discharge.
• Carburetor: Diaphragm type with adjustable H and L needles.
• Bar Length Options: 13", 15", 16".
• Chain Speed: Up to 20 m/s at max RPM.
• Sound Pressure Level: Typically 105 dB(A).
• Vibration Level: Front/rear handles < 2.5 m/s².

Controls and Components

Main controls located on top and rear handle.

Top Handle: Chain brake lever, throttle trigger lockout, choke control, stop switch.

Rear Handle: Throttle trigger, front hand guard, rear grip.

Side Panel: Fuel cap, oil cap, decompression valve (if equipped), air filter cover.

Adjustments: Chain tension screw (side), idle speed screw (carburetor), H/L mixture screws (carburetor), oil pump flow adjustment.

Starting & Operation

Cold Start Procedure:

1. Place saw on clear, level ground. Engage chain brake.
2. Set choke to full position. Press decompression valve (if equipped).
3. Pull starter cord briskly 3-5 times until engine 'pops'.
4. Move choke to half position. Pull starter until engine starts.
5. Blip throttle to disengage choke. Allow 30-second warm-up.

Cutting Techniques: Use lower quadrant of bar for bucking. Let saw do the work; avoid forcing. Beware of pinch points. Plan escape path.

Chain & Bar Maintenance

Regular maintenance ensures optimal performance and safety.

1. Chain Sharpening: File cutters at 30° angle, maintain depth gauges (raker) at 0.025" below cutter.
2. Bar Maintenance: Clean bar groove weekly, flip bar monthly for even wear, check for burrs.
3. Chain Tension: Check frequently when hot; adjust so chain pulls freely but doesn't sag.
4. Sprocket Inspection: Replace drive sprocket when worn (typically every 2-3 chains).

WARNING! Always wear gloves when handling chain. Disconnect spark plug before maintenance.

Engine Maintenance

Air Filter: Clean weekly with soapy water, dry completely. Replace if damaged.

Spark Plug: Clean electrode, set gap to 0.020" (0.5mm). Replace annually.

Fuel System: Use fresh fuel mix (max 30 days old). Clean fuel filter annually.

Carburetor Adjustment: Factory settings typically: L=1 turn out, H=1 turn out. Fine-tune for smooth acceleration.

Exhaust Port/Muffler: Clean carbon buildup every 50 hours.

Storage Guidelines

Long-term storage (over 30 days):

1. Drain fuel tank completely. Run engine until it stalls to clear carburetor.
2. Remove chain, clean and soak in oil. Store separately.
3. Clean entire saw, especially cooling fins and air intake.
4. Store in dry, cool place, protected from dust.

CAUTION! Old fuel can damage engine components. Never store with fuel in tank.

Regulatory Information

EPA/CARB compliant for emissions. Meets ANSI B175.1 safety standards. Contains components that may be hazardous if disposed improperly. For technical support or parts, contact authorized Partner service centers. Original manufacturer: Partner Industrial Products. Copyright © of respective owners.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	Old fuel, flooded, no spark	Use fresh fuel mix; wait if flooded; check spark plug and ignition.
Engine starts then dies	Clogged fuel filter, air leak	Replace fuel filter; check fuel lines and carburetor gaskets.
Poor cutting performance	Dull chain, improper tension	Sharpen chain; adjust tension; check bar groove.
Chain won't turn	Brake engaged, clutch worn	Disengage chain brake; inspect clutch drum and springs.
Excessive vibration	Loose components, unbalanced chain	Tighten all bolts; check chain for damaged cutters.
Chain throws oil	Over-oiling, wrong oil viscosity	Adjust oil pump screw; use proper bar & chain oil.

Service Intervals: Professional servicing recommended every 100 operating hours.

Warning: Do not attempt major repairs unless qualified. Use genuine Partner parts.