Husqvarna 550 XP Mark II service schedule

1. Wear approved PPE: helmet, hearing protection, protective glasses or visor, gloves, trousers and boots with saw protection (boots with steel toe-cap and non-slip sole). Keep a first-aid kit with you.
2. Monthly, engine off: remove the clutch cover and brush wood dust, resin and dirt off the brake and clutch drum. Measure the brake band; replace it if it is under 0.6 mm at the thinnest point.
3. Check the front hand guard has no cracks, moves freely and is firmly attached to the clutch cover.
4. Inertia check, engine off: hold the saw over a stump with both hands, let go of the front handle and let the bar tip fall against the stump. The brake must engage.
5. Running check: start the saw with the chain clear of the ground, hold it firmly, apply full throttle and tilt your left wrist against the hand guard. The chain must stop at once. Do not let go of the front handle.
6. TrioBrake models: check the rear brake trigger moves freely and is undamaged; never carry the saw by it.
7. If the brake fails any check, speak to your Husqvarna servicing dealer before using the saw.

Tools: Chainsaw PPE (helmet, visor or glasses, ear defenders, saw gloves, saw trousers, saw boots), Brush, Vernier calliper

1. Daily: turn the bar over, clear the oil hole and clean the groove.
2. Weekly: file burrs off the bar edges.
3. Check the groove for wear and the tip for roughness; replace the bar if needed.
4. Check the nose sprocket turns freely and its lubrication hole is clear. Clean and lubricate it if needed.

Tools: Flat file, Grease gun for the nose sprocket, Gloves

1. Pull the hand guard back to release the chain brake. Loosen the bar nuts and remove the clutch cover.
2. Check the rim sprocket for wear. If worn, see your Husqvarna dealer.
3. Weekly: lay the saw clutch drum up and grease the needle bearing with a grease gun, using a high-quality bearing grease or engine oil.
4. Monthly: check the clutch centre, clutch drum and clutch spring for wear.
5. Refit the cover and tension the chain.

Tools: Combination spanner, Grease gun

1. Husqvarna says weekly. Remove the cylinder cover and the air filter.
2. Brush or shake it clean, or wash it in detergent and water and let it dry.
3. Refit it so it seals tightly against the filter holder.
4. Different filter types suit different seasons and conditions; ask your dealer.

Tools: Brush, Detergent and water

1. Remove the plug. If dirty, clean it; check the gap is 0.5 mm.
2. Fit a new NGK CMR6H monthly.
3. Fouling comes from a wrong fuel mix or a dirty air filter; put the cause right.

Tools: Combination spanner, Feeler gauge 0.5 mm

1. Daily check: run at three-quarter throttle with the bar about 20 cm above a light surface. After 1 minute you should see a clear line of oil.
2. If not, check the bar oil hole and groove; see a dealer if that does not cure it.
3. Oil flow: engine off. Turn the pump screw clockwise for less oil, anticlockwise for more. Husqvarna recommends medium flow for 38-46 cm bars and maximum flow for 50-71 cm bars.
4. Monthly: empty and clean the fuel tank and the chain oil tank.

Tools: Screwdriver or combination spanner, Light-coloured board or surface

1. Wear gloves and work in a well-ventilated place: the deposits may be carcinogenic. Do not use compressed air.
2. Clean the mesh with a steel brush, brushing away from your body. Do not remove the muffler.
3. Replace a damaged mesh. Never run the saw with the mesh missing or defective.

Tools: Steel brush, Gloves

1. Remove the cylinder cover.
2. Brush clean the starter air intake, the flywheel pawls, the cylinder fins, the cooling channel and the cylinder cover.
3. Clean the carburettor area and refit the cover.

Tools: Brush

1. Work outdoors away from flames. Empty the fuel tank into an approved can.
2. Hook the filter out through the filler, fit the new one to the hose and refit.
3. Monthly: check the filter and fuel hose and replace if needed.
4. Refuel, wipe up spills and move 3 m away from the refuelling spot before starting.

Tools: Wire hook, Approved fuel can, Gloves

1. Wear protective gloves.
2. Use a 4.8 mm round file with the Husqvarna file gauge for your chain type. File from the inside of each cutter outwards, easing off on the return stroke.
3. Do all cutters on one side, then turn the saw round and do the other side. Keep all cutters the same length.
4. Filing angle is 30° for SP33G; follow the gauge for other chains.
5. Every third sharpening, put the depth gauge tool on the chain and file off whatever stands proud with the flat file. The depth gauge setting is 0.65 mm (0.025 in).
6. Replace the chain when the longest part of a cutting tooth is under 4 mm, or if cutters are cracked.
7. Tension the chain so it sits against the bar but pulls round freely by hand.

Tools: Round file 4.8 mm (3/16 in), Flat file, Husqvarna depth gauge tool, Protective gloves

1. Check the vibration damping units for cracks or deformation and that they are firmly attached to the engine and handle unit.
2. Check the chain catcher is undamaged, stable and attached to the saw body.
3. Check the right hand guard has no cracks.
4. If anything is damaged, speak to your Husqvarna dealer before use.

1. Start the saw, apply full throttle, release the trigger and check the chain stops and stays still.
2. If the chain turns at idle, or AutoTune does not seem to work, speak to your servicing dealer. AutoTune settles after a few fuelings.
3. Check the throttle trigger and lockout move freely, and the stop switch stops the engine.

Tools: Chainsaw PPE