SALEM MASTER CG520M Gas Grass String Trimmer User Manual

1. Introduction

This manual provides essential information for the safe and effective operation, assembly, and maintenance of your SALEM MASTER CG520M Gas Grass String Trimmer and Brush Cutter. Please read this manual thoroughly before operating the machine to ensure proper use and to prevent injury or damage.

The SALEM MASTER CG520M is a powerful 51.7CC 2-stroke gasoline-powered tool designed for trimming grass and cutting brush, featuring a straight shaft and a versatile design for various landscaping tasks.

2. Safety Instructions

WARNING: Failure to follow these safety instructions could result in serious injury or death.

• Personal Protective Equipment (PPE): Always wear appropriate PPE, including safety glasses or goggles, hearing protection, heavy-duty gloves, long pants, and sturdy, non-slip footwear.
• Work Area Safety: Keep bystanders, children, and pets at least 15 meters (50 feet) away from the operating area. Clear the work area of debris, rocks, and other objects that could be thrown by the cutting line or blade.
• Fuel Handling: Handle gasoline with extreme care. It is highly flammable. Refuel outdoors in a well-ventilated area with the engine off and cool. Do not smoke or use open flames near fuel.
• Pre-Operation Check: Before each use, inspect the machine for loose parts, damage, or wear. Ensure all guards and safety devices are in place and functioning correctly.
• Operation: Operate the trimmer only in good daylight or adequate artificial light. Maintain a firm grip on both handles. Do not overreach. Maintain proper footing and balance at all times.
• Vibration Reduction: The super shock absorption design helps reduce vibration, but prolonged use can still cause fatigue. Take regular breaks.
• Emergency Stop: Familiarize yourself with the location and operation of the power switch for quick shutdown in an emergency.

3. Components and Parts Identification

Familiarize yourself with the various components of your SALEM MASTER CG520M trimmer.

Figure 3.1: Overview of the SALEM MASTER CG520M trimmer and its accessories, including the main unit, shoulder harness, fuel mixing bottle, tools, and instruction manual.

Figure 3.2: Detailed view of the trimmer's main components, including the engine, fuel tank, starter roll, U-handle, throttle trigger, power switch, protection switch, choke knob, straight shaft, safety guard, and string line head.

Key Components:

• Engine: 51.7CC 2-stroke gasoline engine.
• Fuel Tank: Holds the gasoline-oil mixture.
• Starter Roll: For manual engine starting.
• U-Handle: Ergonomic bicycle-style handle for comfortable and balanced operation.
• Throttle Trigger: Controls engine speed.
• Power Switch: On/Off control for the engine.
• Protection Switch: Safety lock for the throttle.
• Choke Knob: Used for cold starting the engine.
• Straight Shaft: Provides extended reach and durability.
• Safety Guard: Protects the operator from debris.
• Cutting Head: Interchangeable between string trimmer head (0.042" string line) and 3T blade for brush cutting.
• External Manual Oil Pump: For priming the fuel system.

4. Setup and Assembly

The SALEM MASTER CG520M requires some assembly before first use. Follow these steps carefully.

4.1 Fuel Mixture Preparation

Your trimmer uses a 2-stroke engine and requires a specific gasoline-oil mixture. The recommended fuel ratio is 25:1 (Gasoline:2-Stroke Engine Oil). Use fresh, unleaded gasoline with an octane rating of 89 or higher and high-quality 2-stroke engine oil.

1. Obtain a clean, approved fuel container.
2. Pour the required amount of 2-stroke engine oil into the container.
3. Add the corresponding amount of gasoline.
4. Securely close the container and shake it gently to ensure thorough mixing.

CAUTION: Never use pure gasoline or an incorrect fuel mixture, as this will damage the engine and void the warranty.

4.2 Handle Assembly and Adjustment

The U-handle (bicycle handle) needs to be attached and adjusted for optimal balance and comfort.

Figure 4.1: Illustrated steps for adjusting the handle position to achieve proper balance and reduce operator fatigue.

1. Loosen the hook screw: Locate the hook screw on the handle clamp and loosen it using the provided tool.
2. Move to suitable position: Slide the handle assembly along the straight shaft to a position that feels comfortable and balanced for your height and posture.
3. Remove and adjust screws: Remove the handle adjustment screws and find a suitable position for yourself. Reinsert and tighten the screws securely.
4. Balance Check: The goal is to achieve a state of balance where the machine feels lighter, reducing the perceived weight of 18 pounds.

4.3 Attaching the Cutting Head/Blade

Your trimmer can be used with a string trimmer head or a 3T blade.

• String Trimmer Head: Ideal for lawn grass and small grass. Ensure the 0.042" string line is properly wound.
• 3T Blade: Designed for dense grass and heavy brush.

Refer to the specific instructions in the included manual for detailed steps on safely attaching and detaching the cutting heads.

5. Operating Instructions

Follow these steps for safe and efficient operation of your SALEM MASTER CG520M.

5.1 Starting the Engine

1. Fill the fuel tank with the correct 25:1 gasoline-oil mixture.
2. Press the external manual oil pump (primer bulb) several times until fuel is visible in the clear line.
3. Move the choke knob to the

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