Cleaning the Starter Unit

MAINTENANCE

Choose one of the following cleaning options:

9.To lightly clean, tap the filter against a smooth, flat surface to dislodge most saw dust and dirt particles.

10.For a more thorough cleaning, clean in warm soapy water, rinse, and let dry completely.

NOTE: An alternative method is to clean the filter with compressed air (always wear eye protection to avoid eye injury).

11.Reinstall the air filter, making sure that the tabs on the air filter are located in channels on the air filter bottom before tightening filter retainer screw.

■Clean the pre-filter (D) every 25 tanks of fuel or sooner, if required. Remove the cylinder cover (B), starter assembly (E) and the fan housing baffle (F) for access to the pre-filter in the engine housing.

NOTE: If you use an air hose for drying, blow through both sides of filter.

CAUTION:

Never run the engine without the air filter, serious damage could result.

Make sure the air filter is correctly placed in the air filter cover before reassembly.

See Figure 67.

Use a brush or compressed air to keep the cooling vents of the starter assembly free and clean of debris.

CLEANING THE ENGINE

See Figures 68 and 69.

Clean the cylinder fins and flywheel fins with compressed air or a brush periodically. Dangerous overheating of the engine may occur due to impurities on the cylinder.

WARNING

Never run the saw without all the parts, including the drivecase cover and starter housing, securely in place.

Because parts can fracture and pose a danger of thrown objects, leave repairs of the flywheel and clutch to trained Homelite service dealer personnel.

NOTE: Depending on the type of fuel used, the type and amount of oil used, and/or your operating conditions, the exhaust port and silencer may become blocked with carbon deposits. If you notice a power loss with your petrol-powered tool, you may need to remove these deposits to restore performance.

We highly recommend that only qualified service technicians perform this service.

CHECKING THE FUEL FILTER

See Figure 70.

Check the fuel filter (A) periodically. Replace it if contaminated or damaged.

REPLACING THE SPARKING PLUG

See Figure 71.

This engine uses a Champion RCJ-4 with 0.63 mm (0.025 in.) electrode gap. Use an exact replacement and replace every six months, or more frequently if necessary.

1.Loosen the sparking plug by turning it anticlockwise with a spanner.

2.Remove the sparking plug.

3.Hand thread the new sparking plug, turning it clockwise.

NOTE: Be careful not to cross-thread the sparking plug. Cross-threading will seriously damage the product.

CLEANING THE SPARK ARRESTING SILENCER

See Figure 72.

The silencer (A) is equipped with a spark arrester screen (B). A faulty spark arrester screen can create a fire hazard. Through normal use the screen can become dirty and should be inspected weekly and cleaned as required. Always keep the silencer and spark arrester on your saw in good condition.

WARNING

Silencer surfaces are very hot during and after operation of the chainsaw. Keep all body parts away from the silencer. Serious burns may occur if contact is made with the silencer.

1.Allow the silencer to cool.

2.The spark arrester screen (B) is retained by the deflector (C). Remove the nuts (D) and screen retainer to access the spark arrester screen.

3.Replace the spark arrester screen if it is cracked or otherwise deteriorated.

CHAIN BRAKE

See Figures 73 and 74.

■Remove the clutch cover and clean the chain brake components. Check wear on the brake band (A). If brake band is worn or deformed, have it serviced at your nearest authorised service dealer. The band thickness should not be less than 0.60 mm (0.024 in.), or worn halfway through.

■Always keep the chain brake mechanism clean (B) and lightly lubricate the linkage (C).

■Always test the chain brake performance after servicing or cleaning. Refer to “Operation – Operating the Chain Brake” earlier in this manual for additional information.

■Check and, if damaged, replace the chain catcher (D).

UK - Page 17

CSP3816 - UT74123D, CSP4518 - UT74125D, CSP4520 - UT74127D specifications

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