Husqvarna 953900764, 953900756, 953900757 3 4 7 9, Carburetor adjustment, Routine maintenance

After stopping the engine the rotating parts, blade or nylon string head, keep spinning

by inertia for a few seconds. Grip the machine

firmly until they stop. In case of emergency the above delay can be abbreviated by scraping the blade supporting cup parallel on the ground.

G. Carburetor adjustment

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Your machine can be equipped with a low emis- sion carburetor. We recommend that you have any adjustment of the carburetor made exclusive- ly by an authorized service center, which disposes of special equipment for ensuring the best per- formance with the lowest emissions. To adjust the speed to the minimum, turn the screw marked (T) as shown: With the engine running and well warmed up, turn the screw (T) gently clockwise, until the engine rotates at regular speed (stead noise), without the cutting devices in motion. If

the cutting devices are moving, turn the screw (T) gently counterclockwise until you obtain the prop- er adjustment. The correct minimum speed is shown in the instruction manual in the paragraph of technical data.

All the above adjustments should be made with the cutting devices correctly installed.

The warranty may be invalidated due to erro- neous adjustments made by personnel not belonging to authorized service centers.

H. Routine maintenance

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H1. After every use

In order to avoid overheating the motor, remove any dust and dirt from the slots on the cylinder cover and finds of the cylinder using a wooden scraper. Store the machine in a dry place.

After 25 hours of use

Remove the filter as shown in the figure and clean it using a gentle jet of compressed air. For more thor- ough cleansing, you can wash it with soapy water.

After 50 hours of use

Add some high speed gear grease in the gearbox through hole (C). Remove and clean the spark plug (set the space between the electrode at 0.5/0.6 mm). Replace if excessively encrusted. In case of excessive encrustation check the carbu- retor adjustment, the percentage of oil in the fuel mixture and make sure the oil is of excellent quali- ty and suitable for two-stroke engines.

After 100 hours of use

Replace the spark plug.

Every three months

Contact your Service Center for a complete over- haul, replacement of the fuel filter and cleaning of the parts inside the machine. This will reduce the

possibility of unexpected problems and will ensure the good performance and long life of your machine.

Periods of prolonged disuse

See "Environmental information".

If you use the machine in an exceptionally dirty or dusty environment these operations should be carried out more often.

H2. Replacement of nylon string

To replace the reel of string, press both the release pawls indicated by the arrows, remove the empty reel, unroll any string left and rewind the new string. Open the original package of string and insert the ends of the two strings in the eyelets on the reel, then wind the strings com- pletely on the reel in the same direction and fas- ten the end of each string in the 2 opposite grooves. Replace the reel in its housing and thread the ends of the strings in their bushings. Pull each string so that about 15 cm comes out on each side. Reassemble the nylon string head as shown (fig. H5). If the reel becomes excessive- ly worn, replace it with a whole new reel.

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