1. Important Safety Instructions
Read and understand all safety warnings and instructions before operating this petrol tree saw. Failure to follow the warnings and instructions may result in serious injury.
1.1 General Safety
- Personal Protective Equipment (PPE): Always wear appropriate PPE, including safety glasses, hearing protection, gloves, and sturdy footwear.
- Work Area: Keep the work area clean and well-lit. Cluttered or dark areas invite accidents.
- Children and Bystanders: Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.
- Fuel Handling: Handle fuel in a well-ventilated area, away from sparks or open flames. Do not smoke while refueling.
1.2 Chainsaw Specific Safety
- Kickback: Be aware of kickback. Kickback may occur when the nose or tip of the guide bar touches an object, or when the wood closes in and pinches the saw chain in the cut.
- Proper Grip: Always hold the chainsaw firmly with both hands, with thumbs and fingers encircling the chainsaw handles.
- Stable Footing: Ensure stable footing and balance before and during cutting operations.
- Maintenance: Regularly inspect and maintain the chainsaw according to the maintenance schedule. A dull chain can increase the risk of kickback.
2. Components Overview
Familiarize yourself with the main components of your Ingco GCS5451811 Petrol Tree Saw.

Figure 1: Ingco GCS5451811 18-inch Petrol Tree Saw. This image displays the complete chainsaw, highlighting its yellow body, black handles, and the 18-inch guide bar with the saw chain. The Ingco logo is visible on the side of the main body and on the guide bar.
- Engine Housing: Contains the 46CC petrol engine.
- Front Handle: For stable two-hand operation.
- Rear Handle: Includes throttle trigger and safety lock.
- Chain Brake: Safety mechanism to stop the chain quickly.
- Guide Bar: The metal bar that supports and guides the saw chain. This model features an 18-inch guide bar.
- Saw Chain: The cutting component that rotates around the guide bar.
- Fuel Tank Cap: For filling with petrol.
- Oil Tank Cap: For filling with chain lubricant oil.
3. Setup and Assembly
Before first use, ensure the saw is correctly assembled and prepared.
3.1 Fuel and Oil Mixture
This petrol saw requires a specific fuel mixture. Consult the engine manufacturer's recommendations for the correct petrol-to-oil ratio (typically 2-stroke engine oil mixed with unleaded petrol).
- Mix the recommended 2-stroke engine oil with unleaded petrol in a separate, approved fuel container.
- Carefully pour the mixed fuel into the fuel tank (marked with a fuel pump icon). Do not overfill.
- Fill the chain oil tank (marked with an oil can icon) with appropriate chain lubricant oil. This lubricates the chain and guide bar during operation.
- Securely close both fuel and oil caps.
3.2 Chain and Guide Bar Installation (if not pre-assembled)
- Ensure the engine is off and the chain brake is engaged.
- Remove the chain cover nuts and the chain cover.
- Place the guide bar onto the studs.
- Carefully fit the saw chain around the sprocket and into the guide bar groove, ensuring the cutting edges face forward in the direction of rotation.
- Replace the chain cover and loosely tighten the nuts.
- Adjust chain tension: The chain should be snug against the guide bar but still able to be pulled freely by hand. There should be no slack on the underside of the guide bar.
- Once tension is correct, fully tighten the chain cover nuts.
4. Operating Instructions
4.1 Starting the Engine
- Place the chainsaw on a firm, flat surface.
- Engage the chain brake.
- Set the choke lever to the "closed" or "start" position.
- Press the primer bulb several times until fuel is visible.
- Pull the starter cord firmly and steadily until the engine fires (usually a few pulls).
- Once the engine fires, immediately move the choke lever to the "open" or "run" position.
- Pull the starter cord again until the engine starts and runs smoothly.
- Allow the engine to warm up for a few moments before disengaging the chain brake and beginning work.
4.2 Cutting Techniques
Always maintain a firm grip with both hands. Ensure the chain is rotating at full speed before making contact with the wood.
- Felling: For felling trees, plan your escape route and cutting direction carefully. Make a notch cut on the side of the desired fall, then a felling cut from the opposite side.
- Limbing: When limbing, work from the bottom of the tree upwards, removing smaller branches first. Be aware of branches under tension.
- Bucking: When cutting a log into sections (bucking), support the log to prevent pinching the chain. Cut from the top down or bottom up depending on the log's support.
4.3 Stopping the Engine
To stop the engine, move the ignition switch to the "OFF" position.
5. Maintenance
Regular maintenance ensures optimal performance and extends the life of your chainsaw.
5.1 Daily Maintenance (Before Each Use)
- Check chain tension.
- Inspect the chain for sharpness and damage. Sharpen or replace as needed.
- Check chain oil level and fuel level.
- Inspect the chain brake for proper function.
- Clean debris from the air filter and cooling fins.
5.2 Weekly Maintenance
- Clean the guide bar groove and oil holes.
- Rotate the guide bar to ensure even wear.
- Check spark plug condition and gap. Clean or replace if necessary.
- Clean the air filter thoroughly.
5.3 Storage
When storing the chainsaw for an extended period:
- Drain all fuel from the tank and run the engine until it stops to clear the carburetor.
- Drain chain oil.
- Clean the entire saw.
- Remove the chain and guide bar, clean them, and apply a light coat of oil to prevent rust.
- Store in a dry, well-ventilated area, out of reach of children.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine does not start | No fuel; incorrect choke position; fouled spark plug; chain brake engaged. | Check fuel level; adjust choke; clean/replace spark plug; disengage chain brake. |
| Engine starts but stalls | Incorrect fuel mixture; clogged fuel filter; carburetor issues. | Ensure correct fuel mix; clean/replace fuel filter; consult service center. |
| Chain does not cut efficiently | Dull chain; incorrect chain tension; guide bar wear. | Sharpen or replace chain; adjust chain tension; inspect guide bar for wear. |
| No chain oil flow | Empty oil tank; clogged oil port; faulty oil pump. | Refill oil tank; clean oil port; consult service center. |
For issues not listed or if solutions do not resolve the problem, contact an authorized Ingco service center.
7. Technical Specifications
- Model: GCS5451811
- Engine Displacement: 46 CC
- Guide Bar Length: 18 inches
- Power Source: Gasoline
- Horsepower: 3 HP
- Item Weight: Approximately 1 kg
- Product Dimensions: 10 x 20 x 37 cm
- Manufacturer: ENGCO (Ingco)
8. Warranty and Support
Specific warranty details for the Ingco GCS5451811 Petrol Tree Saw are typically provided with the product packaging or can be obtained from your authorized dealer or the official Ingco website. Please retain your proof of purchase for warranty claims.
For technical support, spare parts, or service, please contact your local Ingco service center or the retailer from whom the product was purchased.





