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remove the screw and top cap then look down the stem, inside the tube there should be a star nut, you may need a new star nut or screw, there is a special tool for removing the star nut but you can just hammer it down the tube out the way and push a new one in from the top. dont push the new star nut in too far or the screw will not reach it.
I am not sure if you have figured out how to put the chain back on your saw or not, but it doesn't take long.
1. Remove the plastic yellow "T" shaped nut on the right side of the saw (towards the front of the motor housing)
2. Remove the black plastic housing that covers the rear section of the bar and chain
3. Place the chain back onto the bar making sure it is facing the correct direction.
4. Place the chain over the rear sprocket area
5. Turn the +/- yellow plastic knob (towards the back of the saw on the right side) in the - direction until the metal guide inside the plastic casing lines up with the hole in the chainsaw bar
6. Replace the black plastic housing and slightly tighten the yellow "T" shaped nut.
7. Now turn the +/- knob until the chain is tight. Once the chain is tight, turn the "T" nut until it is tight and you are ready to cut again.
check to make sure that the chain tension is correct. when tightening the bar bolt nuts - lift up slightly on the bar as you tighten the nuts,, and then check the chain tension of the chain.
if you pull up or down on the chain - it should only rise about 1/8th of a inch off of the bar when you pull and snap back into place when you release it.
one other thing to check -- make sure the bar groove is clean and clear of dirt and debris ( use a bar groove cleaner or a small flat blade screwdriver to clear out ).
and,, check the chain to be sure that none of the guides are bent or mis-shaped.
On the side of the saw where the bar (what the chain goes around/rides on) where it connects to the saw there are a couple nuts. Loosen them up, push the bar back towards the saw to put slack in the chain, wrap the chair around the bar making sure the bottom of the chain is in the groove on the bar and tip of the bar, then push the bar forwards away from the saw to take out the slack in the chain. Hold it tight and tighten up the two nuts. Depending on your model of pole saw, you may have only one nut and a plastic guide that keeps it straight. Same concept though. Loosen the nut, push bar in, put chain on, pull bar out, tighten nut.
If you've ever done it on a bicycle, it's the same concept. Loosen nuts on back wheel, push tire forwards and chain gets loose. Pull it backwards and chain gets tight.
well first get the bike up on a stand or set it on a milk crate. Loosen up main axle nuts you may need another wrench on the other side to back it up. loosen any small chain adjustment nuts. pull the chain as far back as it can go all the time looking a the chain sag..you want to keep about 5/8 to 1 inch play...lock just the axle nuts down snug...now spin the tire to see that all parts of the chain maintain this amount of sag. if its too tight in one area, you have a "stretched chain", and this will now be the focal point for tightening up the chain...this tighter part must have "some" slack in it...id say give it about 1/2 inch...now tighten up the chain adjustment nuts finger tight and look at your rear sprocket and make sure it lines up perfectly straight on with the counter shaft sprocket up front. Once this is aligned, tighten the smaller nuts snug, then proceed to torque down lightly maybe 10- 20 ftlbs. now spin the tire to check your slack in the chain did it move on you? Then you have to tighten or loosen the chain adjustment nuts a little more in or out till you get it right so it can move into the correct position. Once you got it right torque down on the main axle nuts 50-60ft lbs. Now tighten evenly each chain nut with the same ammount of turns to each....tighten the last nut down hard onto the first so they wont vibrate off. Now you should lube the chain..and your ready to go. after a while of hard riding recheck everything just to make sure shes secure! Can i get a very helpful on this. thanks!
Slacken the wheel nut a couple of turns ,then simply adjust tension with the chain adjusters at the rear of the swingarm legs.
Look carefully you will see notches marked on both sides of the swingarm by the wheel spindle these must be the same on both sides, your manual will tell you the chain slack for your bike.probably about 25-35mm put a ruler up to the chain and using finger pressure push up on the chain ,this is the chain slack.
Once done tighten the wheel nut up to correct torque setting.( manual or call local dealer),then replace split pin with new through the wheel nut.
Double check all your work no loose nuts,then sit on the bike get a friend to wiggle the chain there should be small slack as first meashured 25-35mm again, if not re-try,once experienced you will do it first time.