Service & Maintenance Question
when my 350 chainsaw bit the dust-I put my larger older one...escalated
Service & Maintenance Question posted February 11, 2014 by Jerry messing, last edited February 11, 2014
29 Views, 2 Comments
Question:
when my 350 chainsaw bit the dust-I put my larger older one in service. It is a 24" saw and cuts like crazy. It throws 3/8" chips sufficient to cover your boot in 5 sec. Then, as top of the bar reaches the top of the log, cutting just stops. It is as if it were a bearing rather than a chain!
I have had the chain re sharpened and put on a NEW BAR --same results. clutch is fine and chain cuts great UNTIL the bottom of the chain on top of bar reaches the work.
Then if I stop, it is difficult to remove bar from log.
I cut "down" WITH NO DOWN PRESSURE,with supports UNDER the work so no binding can occur--but this happens too soon anyway,as a bind would happen later in cut, if it all.
I am cutting dry lodge pole 14"-16" in diameter. what gives??
I have had the chain re sharpened and put on a NEW BAR --same results. clutch is fine and chain cuts great UNTIL the bottom of the chain on top of bar reaches the work.
Then if I stop, it is difficult to remove bar from log.
I cut "down" WITH NO DOWN PRESSURE,with supports UNDER the work so no binding can occur--but this happens too soon anyway,as a bind would happen later in cut, if it all.
I am cutting dry lodge pole 14"-16" in diameter. what gives??
Answer
Jerry,
You say that the clutch is "fine" or OK ? Does the engine stall out when this binding occurs, or is the engine still running and the chain is Not moving ?
If it is the latter, and the engine is still running but the chain is Not moving, then the problem is the clutch. If a clutch gets overheated or just well used its possible for the clutch springs to become weak, and they will not allow the clutch to work properly, even though under no load, and when the clutch is at clutch engagement speed the clutch appears to engage. Also the clutch shoes have an optimum diameter, and when the clutch shoes become worn, they are no longer at the proper distance from the inside of the drive sprocket drum.
I would also check the engines RPM's at the following conditions, idle speed, clutch engagement speed, full throttle (WOT), and full throttle with load.
You did "not" say that the engine is slowing down or sounds like an engine problem, so that again brings me back to suggesting the clutch has a problem, worn shoes, weak springs, or possibly worn drive sprocket drum (inside diameter).
I hope this helps.
PS. I am not a Husqvarna Representative or Authorized Repair, just an experimental chainsaw person.
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Jerry,
One more thought on checking the drive sprocket, the gear that drives the chain and is attached to the sprocket drum. I have heard of this gear getting loose on the drum, I think they are a compression or crimp fitting, and some may be welded on too. anyhow make sure the gear turns with the drum and cannot turn independantly of the drum.
Please let me know what you discover, and give me another shout If I can help.
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