Purpose of oiler worm gear wires?

Robert P

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Jul 11, 2014
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216
The wires that protrude from the worm drive gear that I see on various brands that use this kind of oiling system - are these to clear away debris that might work its way in?


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Nutball

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They fit into notches in the clutch drum allowing the pump to be driven by the sprocket. If the chain does not turn, neither will the pump. A few cheap saws have a shaft driven worm gear, so oil pumps as long as the engine is running, which makes a pool of oil under the saw if you let it sit and idle for a few minutes.
 

Bart

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My old 260 had the wire drive all good. My newer 260 had engine running oiling and will blob out a lot of oil when you start a cut after it's been idling. Can be very messy. Stihl just cheaping out? I don't know.
 

BlackSmith

Uncivil
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It’s an air cooled engine, it shouldn’t be let sit and idle. Just my opinion and no technical facts to back it up.
 

Nutball

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My old 260 had the wire drive all good. My newer 260 had engine running oiling and will blob out a lot of oil when you start a cut after it's been idling. Can be very messy. Stihl just cheaping out? I don't know.
Pro vs no Pro model, I think. Less to go wrong until the oil runs out because the saw sat idling for 15min while wood is being moved around.
 

Magnus

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Why have it idling for 15 minutes? Is there something wrong with it?
A pull in cord is better than idle.
There are many aspects in this that argue for shutting off rather than Idle.
Mechanically it is not a sound thing to do. If it is a bit too hot when you set it on idle, it will not cool.
To cool you flip throttle up and down a few times without load. Fan create airflow, fuel/air mix both cool it a lot better and faster than you can think.
 

Nutball

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Because letting the saw idle for a long time is what homeowners do when cutting some firewood in the woods, or cleaning up a fallen branch.
 

Al Smith

Mac Daddy
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Mar 6, 2005
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Northern Ohio
Mine seldom idle except a bull headed Husqvarna 2100 CD and that's only for a short time after a cold start .The later model Stihl's used a wire drive however I have an 024 with a worm gear drive . The McCullochs use an impulse pump drive by crankcase pressure and vacuum .The Partner p-100's have most likely in my opinion have the best being a worm drive within the internals of the crankcase that can be regulated plus have a thumb button . Plus those use a hole in the crankshaft that uses the fuel mixture to oil the clutch bearing . I might add those are the most interesting design of any saw I've ever worked on If they dribble a little doesn't bother me .
 
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