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If this is the tooless adjustment, it sounds like the small gears in the cover have stripped, remove the side cover, turn it over and remove the cover over the tentioning mechanism, replace parts as required.
Between the chain bar and the body there is an adjusting screw, if the adjusting screw is stripped it will not pull on the chain bar to tighten the chain. procedure for tightening chain. loosen the chain guard nuts, tighten the bar adjusting screw by turning to the right or clockwise, the chain has to roll freely around the bar but not bind. check with gloves or rag, don't use bare hands to avoid accidents. once chain is adjusted, tighten the chain guard nuts. good luck!
This will be the basic instruction for most common
saws. Check that the chain brake is in disengaged position by moving the front
hand guard towards the front handle if the saw is equipped with a chain brake
on the handle. Loosen the bar nuts on the clutch cover. Loosen tension screw or
other adjuster (thumbscrew) to allow the bar to be moved toward the engine.
Some saws have this tension adjustment built into the bar. This will provide
enough slack in the chain to able to reinstall it. It may be necessary to
remove the side cover to gain access to the clutch/gear assembly on the side of
the engine if the chain also jumped the gear here. Remove the cover, inspect
for any debris or other obstructions in this area. If none, replace the chain
back over the drive gear and in the bar groove all the way around the bar. It
may be necessary to turn the bar adjuster screw more to provide enough slack in
the chain to do this. Once the chain is in place reinstall the cover and bar
lock nuts. Snug up the nuts but do not tighten these. Turn the bar/chain
adjuster screw to tighten the chain on the bar (take up slack). I usually
tighten to a point where there is no slack between the chain and the bottom of
the bar and I can still turn the chain easily around the bar by hand. With
experience you will get the feel for this chain tension. Once the chain is
properly tensioned, tighten the bar lock bolts/ nuts on the side cover.
Some Poulan Pros have an adjuster screw on the front of the engine case right beside the bar, some have a tool less adjuster on the clutch cover, and some have a slot in the bar for adjusting the chain tension.
Hello there. Regarding the bar oil, many loggers plan their work so that they are out of bar oil at the same time that they quit for the day because bar oil has a tendency to leak. Another method that has some success is to mix your bar oil with a heavier oil but the trade off might be less lube getting to the chain when you need it.
Regarding the chain moving in idle, this is another common problem. You can usually slow the idle down until the chain stops, as you indicated, but I too have had chain saws where I finally just decided to live with it and be extra attentive to what was going on.
I have several saws, among them a big Stihl and Husky, and a 46cc Poulan that I bought in 1994 that I have run through thee bars and a bunch of sprockets and chains. I use it today to buck my fire wood lengths. First, clean the carb out with a good spray carb cleaner. This will ruin your plug. Make sure your cleaner is okay. You really ought to replace all the plastic gas lines fron the carb and back and to the bulb. Make note of what goes where when you take them off.
When you get them, put the on, and some fresh oil/gas mixture. Pump that primer til you smell good gas, not the shellac smell of ruined gas.
If it starts, spray a little starter fluid in it and have your small screwdrivers on hand. Hold the throttle wide open, and ad just the hi speed screw til you hear it smooth out. Start by turning it to the right. If it doesn't smooth out or gets worse, start quarter turns to the left. Eventually you will get it to where it will winf to the max rpms.
Then, you have to work on the lo speed. I'd start by closing it and counting the turns. Try starting it bit by bit using 1/2 turns. Eventually you will get to a point where it starts easily at lo speed, and you'll find you may need to make a final adjustment on the hi speed. Mark down for the future how many turns each is.
Then go buy that guy's store and saw his door frame in half!