Introduction
This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your Stiga SP 375 Q Gasoline Chainsaw. Please read this manual thoroughly before operating the chainsaw to ensure proper use and to prevent injury or damage.
The Stiga SP 375 Q is a lightweight and comfortable-to-use gasoline chainsaw, offering an excellent power-to-weight ratio. It is equipped with a high-torque 37.2 cm³ 2-stroke gasoline engine, an automatic oil pump, and delivers 1.2 kW (1.6 hp) of power. The 35 cm bar and chain are manufactured by Oregon. The chain reaches a speed of up to 21 m/s and features tool-less tensioning for convenience.
Safety Instructions
Operating a chainsaw can be dangerous if proper safety precautions are not followed. Always prioritize your safety and the safety of others.
- Read the Manual: Always read and understand the entire user manual before operating the chainsaw.
- Personal Protective Equipment (PPE): Always wear appropriate PPE, including a safety helmet, eye protection, hearing protection, gloves, and chainsaw protective trousers and boots.
- Work Area: Ensure the work area is clear of obstacles, bystanders, and animals. Maintain a firm footing and balance.
- Fuel Handling: Handle gasoline with extreme care. Refuel in a well-ventilated area, away from ignition sources. Do not smoke while refueling.
- Inspection: Before each use, inspect the chainsaw for loose parts, damage, or wear. Ensure the chain brake is functional.
- Kickback: Be aware of kickback. Avoid cutting with the tip of the guide bar.
- Maintenance: Perform regular maintenance as described in this manual to keep the chainsaw in safe working condition.
Package Contents
Upon unpacking, please verify that all items are present and undamaged:
- Stiga SP 375 Q Gasoline Chainsaw (main unit with guide bar and chain installed)
- Second Oregon Chain
- Practical Storage Box
- User Manual (this document)
Image: The Stiga SP 375 Q Gasoline Chainsaw, shown with its guide bar and chain, alongside a separate second Oregon chain and a practical storage box.
Setup
1. Fuel and Oil Mixture
The Stiga SP 375 Q uses a 2-stroke gasoline engine. It requires a specific mixture of unleaded gasoline and 2-stroke engine oil. Refer to the engine oil manufacturer's instructions for the correct mixing ratio, typically 50:1 (2% oil) or 25:1 (4% oil) depending on the oil type. Always use fresh, high-quality fuel and oil.
- Mix the fuel and oil in a separate, approved fuel container.
- Shake the container thoroughly to ensure proper mixing.
- Fill the chainsaw's fuel tank carefully, avoiding spills.
2. Chain Lubrication Oil
The chainsaw features an automatic oil pump for chain lubrication. Fill the chain oil reservoir with high-quality bar and chain oil. Do not use waste oil or motor oil, as this can damage the pump and chain.
3. Chain Installation and Tensioning
Ensure the guide bar and chain are correctly installed. The Stiga SP 375 Q features tool-less chain tensioning.
- Loosen the side cover knob.
- Adjust the chain tensioning screw until the chain fits snugly against the guide bar, but can still be pulled freely by hand. There should be a small gap (approx. 2-3 mm) between the chain and the underside of the guide bar when lifted.
- Tighten the side cover knob securely.
- Check chain tension again after a few cuts, as new chains can stretch.
Image: Side view of the Stiga SP 375 Q Gasoline Chainsaw, illustrating its general design and components.
Operating
1. Starting the Engine
Always place the chainsaw on a firm, flat surface before starting. Ensure the chain brake is engaged.
- Engage the chain brake by pushing the front hand guard forward.
- Set the choke lever to the "full choke" position (for cold starts).
- Press the primer bulb several times until fuel is visible.
- Pull the starter cord firmly and steadily until the engine fires briefly.
- Move the choke lever to the "half choke" or "run" position.
- Pull the starter cord again until the engine starts and runs smoothly.
- Disengage the chain brake before beginning to cut.
2. Cutting Techniques
Always maintain a firm grip with both hands on the chainsaw handles. Stand with your feet apart for good balance.
- Felling: Plan your felling direction. Make a notch cut on the side of the tree in the felling direction, then a felling cut from the opposite side.
- Limbing: Remove branches from a felled tree. Work from the base of the tree towards the top, cutting smaller branches first.
- Bucking: Cut a felled tree into logs. Support the log to prevent pinching the guide bar.
3. Stopping the Engine
To stop the engine, simply move the ignition switch to the "STOP" position. Engage the chain brake immediately after stopping the engine.
Maintenance
Regular maintenance is crucial for the longevity and safe operation of your chainsaw.
1. Chain Sharpening
A sharp chain is essential for efficient and safe cutting. Sharpen the chain regularly using a round file of the correct diameter (refer to chain specifications) and a flat file for depth gauges. Alternatively, have it professionally sharpened.
2. Cleaning
- Air Filter: Clean the air filter regularly, especially in dusty conditions. A clogged air filter can reduce engine performance.
- Cooling Fins: Keep the engine's cooling fins free of sawdust and debris to prevent overheating.
- Guide Bar Groove: Clean the groove of the guide bar to ensure proper chain lubrication and movement.
3. Spark Plug
Inspect and clean the spark plug periodically. Replace it if it is fouled or worn. Ensure the correct spark plug gap.
4. Storage
When storing the chainsaw for an extended period:
- Drain the fuel tank or run the engine until it runs out of fuel.
- Clean the chainsaw thoroughly.
- Apply a thin layer of oil to the guide bar and chain to prevent rust.
- Store in a dry, well-ventilated area, out of reach of children.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine does not start | No fuel; incorrect choke setting; fouled spark plug; clogged fuel filter. | Check fuel level; adjust choke; clean/replace spark plug; clean/replace fuel filter. |
| Engine runs, but chain does not move | Chain brake engaged; clutch issue. | Disengage chain brake; consult service center for clutch issues. |
| Poor cutting performance | Dull chain; incorrect chain tension; insufficient chain lubrication. | Sharpen chain; adjust chain tension; fill chain oil reservoir. |
| Engine overheats | Clogged cooling fins; incorrect fuel mixture. | Clean cooling fins; ensure correct fuel/oil mixture. |
If you encounter problems not listed here or if the suggested solutions do not resolve the issue, please contact a qualified service technician.
Specifications
| Feature | Detail |
|---|---|
| Brand | Stiga |
| Model | SP 375 Q |
| Engine Type | 2-stroke gasoline engine |
| Displacement | 37.2 cm³ |
| Power Output | 1.2 kW (1.6 hp) |
| Bar Length | 35 cm |
| Chain Speed | 21 m/s |
| Chain Tensioning | Tool-less |
| Weight | 5.3 kg |
| Power Source | Gasoline |
| Manufacturer | Stiga |
| ASIN | B07HD9611V |
| First Available Date | January 15, 2020 |
Warranty and Support
Specific warranty details for the Stiga SP 375 Q Gasoline Chainsaw are not provided in this document. Please refer to the warranty card included with your product or visit the official Stiga website for detailed warranty information and terms and conditions.
For technical support, spare parts, or service inquiries, please contact your authorized Stiga dealer or the Stiga customer service department. Contact information can typically be found on the Stiga website or on the product packaging.
When contacting support, please have your product model (SP 375 Q) and serial number (if applicable) ready.
