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Hi - need some advice please. I have a Shindaiwa Pole Saw - which I'm using more than I expected at the moment. It's in good condition - and I try and service it more than specified. Yesterday I encountered a problem. It jammed-up when limbing a tree. Turned-out that the chain had tightened-up so much when running it simply stopped moving. The funny thing is that if I loosen and adjust it - it's very loose on some parts of the rotation and tight as tight on other parts. Tight means really tight - and loose means almost loose enough to jump-our of the groove. So I removed the old chain and replaced it with a brand new one. Same issue. I removed the bar (which is also less than 2-3 hours old) and cleaned it out. The end sprocket rotates beautifully, there are no bends or apparent tight spots and the chain groove is clear and free of any burrs. The oil pump is working and everything seems well lubricated. I then looked at the chain sprocket. It's steel, hefty and looks in good nick. I do have a slight suspicion that it may the culprit - but can't detect any run-out by eye. There's nothing trapped in the teeth of the sprocket - and no discernible damage (it actually looks like 'new'). I took it off and re-seated it - and there was no improvement at all. That just leaves the shaft from the gearbox to the chain sprocket. Again, there's no play in the that - and I can't detect any run-out. Now thoroughly mystified. So my question is this. Anyone got any suggestions as to what it might be? I have seen that there have been some other posts about tight chains on Pole Saws - but that seems to be down to lubrication issues - and in my case it's tight spots and loose spots (if that makes sense!). Could it be that I'm overlooking something? Interestingly this is the only real trouble I've had with Shindaiwa. My perspective is that the stuff they make (made?) is really top-drawer.

Hi everyone. This is my first post here. I'm a landscaper who uses his chainsaw rarely. So rarely in fact, I only have an electric chainsaw. Yes, I said the word that's probably banned here. I only use it for small parts of my job. For real tree work, I call my tree surgeon! It's a Black & Decker GK2240T. ANYWAY. I hit a nail in an old fence post I was chopping last week, the saw jammed nicely, so I presumed I'd find bits of nail under the cover and the chain to be all mangled. But it wasn't. Everything seemed fine. I took the chain off, gave everything a clean. But now the chain won't turn. The throttle works fine. The drive sprocket spins freely when no chain is attached. And it actually drives the chain when it's really loose. But as soon as I tighten it to how it should be, I can't even move the chain along by hand. And when throttling, the motor will run, but it won't engage the drive sprocket enough to turn the chain. I've looked at the bar, and it doesn't appear bent (by eye). The nose sprocket turns freely. I've cleaned out the groove in the bar, and it doesn't look pinched anywhere. The chain doesn't look visibly damaged as far as I can see (but besides the blades being blunt etc I don't really know what to look for) Any advice? If I can't move the chain by hand when tight, does that say something obvious? Do I need a new chain? New bar? Any help would be much appreciated. And I know that by default, having an electric saw makes me a bit of a joke here, but I humbly and honestly look up to you guys for your expertise. Thanks in advance. Jon