Husqvarna 343F, 345FX, 345FXT, 343R, 345RX manual Inspecting Crankshaft

Page 55

7	Crankshaft and crankcase
	Inspecting the	Inspecting the
	crankshaft	crankshaft
	Inspect the large end of the connecting	The crankshaft cannot be reconditioned
	rod.	but must be replaced if it is worn or
		damaged.
		Inspect the large end of the connecting
		rod. If seizure marks, discolouration on
		the sides or damaged needle holders
		are found the crankshaft must be
		replaced.

Inspect the small end of the connecting	Inspect the small end of the connecting
rod.	rod.

If seizure marks or discolouration are found in the bearing track the crank- shaft must be replaced.

Check the crank bearing.	Check the crank bearing. The connect-
	ing rod shall not have any radial play
	(up and down).

It should, however, have axial play, in order to ensure good lubrication of the crank bearing among other things.

Inspect the crankshaft bearing and	Check for wear in the crankshaft
sealing rings.	bearing and sealing rings.

Clean the bearings and rotate the outer ring. If movement is “jerky” the bearing track is probably damaged. If so, replace the bearing.

Also check that the gap is not too great.

Inspect the sealing rings. The seal edge shall be sharp or slightly ground.

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Contents English Workshop Manual Brushcutter, Trimmer Model 343R, 345RX, 343F, 345FX, 345FXT ContentsGeneral recommendations Starter ContentsDismantling 1StarterStarter AssemblyReplacing the drive dogs Electrical system Checking the ignition spark Electrical system502 71 Tip 502 50 Replacing the spark Plug cover502 54 Heated handles Drive dogsWiring diagram Electrical system Fuel system Air filter Fuel systemFuel filter Tank ventingCarburettor Fuel pumpDismantling Metering unit Carburettor’s designBlending unit Dismantling the carburettor Pump unitFuel system For example, the H-needle is a PositionedLittle shorter than the L-needle Assembling the carburettor Are not bent or pinched when H-needle is a little shorterThan the L-needle Check carefully that the fuel hosesBasic setting Carburettor settingsFine adjustment Idling speed T-screw Setting Recommended max. speed must not be exceededCorrectly adjusted carburettor Tachometer should always be used to find the optimalRotating Carburettor adjustment 345RX/FXAdjusting the L-needle Adjusting the H-needle ThrottleCheck for wear on pins a and B Tip Page Centrifugal clutch 502 21 Centrifugal clutchDo not lose the sleeve bearings found in the clutch shoes Centrifugal clutch502 11 Clutch drumChange the bearings in the clutch housing if necessary Page Angle gear Let the small circlip around the axle remain Angle gearInput axle with pinion must be dismantled first 503 97503 80 ShaftCylinder and piston Cylinder and piston When the valve is fitted the small hole must face outwards Turn the valve the right way when fittingDecompression valve Inlet manifold Cleaning, inspectionInsufficient lubrication Analysis and actionsCause Action Piston scoring caused by heavy carbon deposits Piston ring breakage Piston damage caused by a too high engine speedCause Foreign objectsDefect Action Service tipsWear tolerances Crankshaft and crankcase Crankshaft and crankcase 502 52 Crankshaft and crankcaseInspecting Crankshaft Assembly To ensure a proper seal Leakage testing CrankcasePress down the sealing plates as Far as possible between the bolts503 55 Husqvarna E-Tech