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Re building the brake is a skilled job, you need to know what you are doing or the brake could fail to function in a kick back situation, my advise would be to purchase a complete brake assembly and fit, i can go through the re build if you feel confident to do it, but there could also be parts missing if somebody else has taken it apart. The part no. for the brake complete is 530054736.
Sounds like the chain brake was set when you took the cover off. You need to disengage the chain brake (release it) so the round spindle will fit inside. Look for the two parts (one on cover, one on saw) that match up at the base of the chain brake. You won't be able to fit the whole cover on, but if you can line up where the metal triangular gear engages the chain brake, you can give it a snap to disengage it. What I have done in the past is to line up the two parts and push down on the top of the cover where they meet so as much of the gear is in the chain brake release as possible ( I put a knee on it ) and then give a snap to release it. Be careful though, because the cover part is plastic and you don't want to strip that part of the chain brake assembly. Good luck.
Sounds like the cover was taken off with the brake on. On some of the Huskies, the brake is engaged with a three-part metal piece that fits into a corresponding shaped part on the cover and is engaged with a firm click on or off. The piece looks a little like the old nuclear bomb shelter signs, like three pie wedges with the narrow parts meeting in the middle. Be careful not to strip the plastic part when trying to marry these two sections together or you will be buying a new cover. I lined up both parts, made sure it was in as far as possible, put a knee on it, and snapped the chain brake off. This opened the band, and it fit once again. Note: I did this correctly the second time it happened to me. The first time resulted in a brand new pretty cover for my used saw because I tried forcing it and stripped the plastic part it the metal piece fits into. Good luck.
The chain brake is activated, if the hand guard is connected to the brake cover, carefully clamp the brake in a vice ( be careful not to damage the cover ) now pull the hand guard fully back until the brake clicks off, if the hand guard is on the saw itself, remove the two screws and remove the hand guard, use this as a tool to fit into the brake and load it.
Check that the chain brake is in disengaged position by moving the front hand guard towards the front handle. Remove the bar nuts and remove the clutch cover (chain brake). Take off the transportation ring. Fit the bar over the bar bolts. Place the bar in its rearmost position. Place the chain over the drive sprocket locate it in the groove on the bar. Begin on the top edge of the bar.
Make sure that the edges of the cutting links are facing forward on the top edge of the bar. Fit the clutch cover (chain brake) and locate the chain adjuster pin in the cut-out in the bar. Check that the drive links of the chain fit correctly on the drive sprocket and that the chain is in the groove on the bar. Tighten the bar nuts finger-tight. Tension the chain by turning the chain tensioning screw clockwise using the combination spanner. The chain should be tensioned until it does not sag from the underside of the bar. The chain is correctly tensioned when it does not sag from the underside of the bar, but can still be turned easily by hand. Hold up the bar tip and tighten the bar nuts with the combination spanner. When fitting a new chain, the chain tension has to be checked frequently until the chain is run-in. Check the chain tension regularly. A correctly tensioned chain ensures good cutting performance and long life.
Tools you will need: 1/2 Socket (to remove bar nuts) T25(torq) or you can use a Flathead screw driver but is a little harder.
Remove 2 bar nuts,Clutch cover,bar,chain, 2 screws on black bar handle right behind clutch cover(this is needed because there is a hidden screw there for the chain break) You will need a new chain brake (my guess is that it is part # 530071893 aprox $15) but you will want to verify that with your model number.
You should see the chain break assembly, 3 - T25 screws are visible after the clutch cover is removed(note sometimes you have to clean saw dust to make screw head visible) the other T25 screw is hidden under the black bar handle. Once you remove all 4 screws on the chain brake you will be able to pull it off.
Installing the new one is the tricky part because if it is set(or break is on) you will have a hard time putting it on.One of the easiest ways is to focus on it near the muffler you will see that a metal 3 pronged gear fits into the plastic part of the chain break handle.and if the band is too tight to fit over the clutch drum you will have to carefully reset it by applying pressure onto the area that has the 3 pronged gear and chain break handle make sure that the handle is pushed forward all the way while you apply pressure then slowly pull chain break handle back till you hear a "snap" this resets the chain brake spring and the band should now fit over the clutch drum.Now, proceed with putting back together 4 chain brake assembly screws,2 handle screws,and bar,chain,clutch cover,and 2 bar nuts.
Please note it is important that you apply quite a bit of pressure onto chain break area where metal (3 pronged) gear fits into handle while resetting or when you reset it the metal part can cut into and damage the plastic piece in the chain break handle.
You can see a breakdown here: http://www.searspartsdirect.com/partsdirect/part-model/Poulan-Parts/Chainsaw-Parts/Model-P4018WT/1324/1503220/P0506041/00002?blt=06&prst=0&shdMod=P4018WT
The humming is the motor trying to turn. Remove the drive end cover from the bar and chain--back off the chain adjustment CCW several turns. If the saw has a chain brake, release it. When the cover is loose, remove the bar and chain, inspect the entire mechanism for any damage--particularly the chain itself. Run the motor without the bar and chain, and check for oil oozing out of the side port in the motor case where the bar fits. To reassemble, fit the bar in place after cleaning the small oil passages in the drive end, then fit chain over the sprocket. Pull the bar outwards to tighten the chain, then fit the cover and fasteners finger tight. Adjust the lower run of chain up to the bar (the lower run of teeth cut toward you), but not so tight that you can turn the chain by hand. Tighten the fasteners and recheck chain tension. Chain saws don't seem to like cutting hedges and other small branch, but tough bushes and the like. Make sure the chain teeth are properly sharpened. Hope this helps!
hate to say this,but,there is no way to adjust the tension on the brake band.either the spring is weak or the brake band is broken.either can be changed but it's not easy.spring is under a lot of tension and can fly out when taking it apart or installing,you can get the entire cover as a unit if so desired...hope this helps,let me know
I have a 340 Huskuvarna but experienced the same problem. It must be a common Husky problem because when I called their tech support the lady told me exactly what to do. So your first solution is to call tech support and they will talk you thru it. Basically though... after you have your bar and chain on. Put you brake handle forward (brake ON postion). Put your cover on, bar nuts on loosely and get the brake part engaged with the cover plate. It doesn't look right at this point. The cover will be crooked/cocked with the front part on and the back part over the clutch off. Then push down on the back part as you pull the brake handle into the off position.