Question about Husqvarna , No.455 Rancher, 20" Gas - Powered Chainsaw

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The engine will run but chain does not move. what could be the broblem

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Hi,
Right inside of where the bolts are that hold the bar on and the chain tensioner is... there is a centrifugal clutch that engages the chain when the engine revs up...that clutch has gone bad and is not transferring the power from the saw to the chain...
Of that is assuming that the chain is on the sprocket and not sitting off to the side of the sprocket...

heatman101

Posted on Jan 04, 2011

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First thing is make sure chain brake is not engaged is so equipped. Next make sure that chain tensensioner is not to tight to allow chain to rotate. I wouuld remove bar and chain from saw and spray both several times with WD-40 and work chain link by link until they all move freely.Clean and lube guide channel on bar and make sure that bar is not dented or badly rusted.If all else fails replace bar and chain. Good luck and thank you.

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Make sure that you can move the chain by hand and that it is being properly oiled. Remove the bar and chain after releasing the chain brake. Clean the side of the engine where the bar fits to, then start the engine--oil should ooze out of the port. Wash out the interior of the clutch with spray carburetor cleaner to clean away excess oil accumulation. Clean the drive end of the bar small oil passages that run from the large holes out to the chain groove on each edge. If oil oozed out during the run test, reassemble everything making sure the chain teeth cut toward you on the bottom run. Adjust the chain up to the bar, but not so tight that you can't move the chain by hand. Tighten the cover fasteners and recheck the chain tension. Start the engine and run the bar tip near some cardboard--it should throw off a thin line of oil after several moments. Hope this helps!

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I bought a used McCulloch 4016. The engine can rev up nicely, but it cannot cut through 2 inch piece of wood. It does not stall, the chain just stops moving, and the engine seems to slow down as if it...


A dull chain can certainly cause loss of cutting ability and generate a lot of heat in the chain. The clutch may be full of chain oil and is slipping. Remove the bar and chain, then wash out the clutch internals with spray carburetor cleaner and let dry out. Clean the oil passages in the drive end of the bar including the two small passages that go out from the large holes to the chain groove an each side. Clean the entire chain groove. Start the engine with the bar and chain off of the saw--you should see oil ooze out of the small port in the engine case where the bar fits to. Reassemble the bar and chain after everything is cleaned--tighten the chain until the lower run just pulls up to the bar, but you can still run the chain by hand. Make sure the chain teeth are properly file sharpened and the teeth cut toward you on the bottom run. When running, the engine should 4-stroke at speed unloaded, but immediately 2-stroke when cutting. Hold the bar tip near some cardboard while running the engine at speed for several moments--it should throw off a thin line of oil on to the cardboard. Hope this helps!

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Does the chainsaw seem to rev up without any resistance, or does it bog down as you push the throttle? If it revs up quickly, then it sounds like the clutch plates may be frozen - usually due to rust. If it boggs down, then the chain and/or clutch housing are frozen or stuck somewhere.

The chain drive uses a centrifugal dry friction clutch with two weighted plates that are spring loaded. The springs keep the plates disengaged from the clutch housing to allow the engine to spin freely at an idle (or slip when the chain slows down due to the blade binding).

When you press the throttle, the engine revs up and the higher RPMs create centrifugal force causing the clutch plates to push outward - fighting against the springs, and begin creating friction on the inside of the clutch housing. If rust prevents the clutch plates from moving out to cause the necessary friction, the clutch housing (and drive gear which is permanently affixed to the housing) won't spin and the chain won't move.

With the engine OFF and cool...first take a thick towel or rag and place it over the chain with the engine switch in the OFF position. Try to move the chain in the normal rotation (top forward, bottom backward) to see if the chain moves freely or if it is stuck in position. If it does move, then take off the chain cover and then get a can of PB Blaster and spray the clutch plates and springs. Give it an hour or so and then take a rag and wipe off the excess and reassemble and try it. The excess PB Blaster will burn off with the heat of the clutch and the rust will no longer be a problem.

If the chain won't move, then somewhere along the drive the chain or clutch housing are stuck. Look for a bend or kink in the bar where the chain rides.

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1 Answer

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1 Answer

Saw is running, but chain is not moving


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