Brake mechanism stuck in locked position Husqvarn 142 chainsaw
I loosened the Brake nuts to adjust the chain tension and caught my wrist against the brake, pushing it "on". Had to wiggle the brake housing to remove it and having clean all parts and starting to reassemble it I realised that the brake handle is rigid within its slide in the external housing. How do I persuade the rachet within the handle to let the brake return to the "off" position please. Trevor B
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Re: Brake mechanism stuck in locked position Husqvarn 142...
COMMON PROBLEM----you have to push it forward you wont break it, it is much stronger than you think you just have to hold the cover section and push or lever the bar forward, it will go. I believe one Ace hardware guy had some sort lever wrench made up just to do this for all the people like you. so muscle up and do it "youdoit "
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Measure the chain's tension with a ruler. Move the center
point of the bottom half of the drive chain with your hand. Take a
measurement of the chain's movement as you push the chain up and down as
far as it will go. The chain should have a free range of movement
between 0.8 to 1.2 inches. If the chain's free range is greater than 1.2
inches, you need to tighten the chain. Alternatively, loosen the chain
if it has less than 0.8 inches of free movement.
Loosen the large nut on the left side of the rear axle with a
32 mm socket and a socket wrench. If more leverage is needed to loosen
the nut, use a long-handled breaker bar.
Loosen the chain adjuster blocks on both side of the rear
swing arm with a pair of 10 mm wrenches. Hold the blocks' adjustment
bolt's head steady with one wrench and loosen the bolt's lock nut with
the other wrench.
Turn both adjustment bolts an equal number of turns with a
10 mm wrench to adjust the chain's tension. Turn the adjustment bolts
clockwise to loosen the chain, or counterclockwise to tighten the chain.
Check that the edge of both chain adjuster blocks are evenly aligned
with the adjustment marks imprinted on the swing arm.
Check the chain's range of free movement again. Make
adjustments as needed until the chain has a free range of movement
between 0.8 and 1.2 inches.
Hold the adjustment bolts steady with a 10 mm wrench and
tighten their lock nuts against the chain adjuster blocks with a second
10 mm wrench. Tighten the axle nut to 72.5 foot-pounds with a 32 mm
socket and a torque wrench. Check the chain's tension again.
Attach cable to brake shoe before mounting the brake. You might have to wedge it in position. After-which adjust brake shoe pressure against the drum. Loosen or tighten adjustment tension nut at the hand brake lever if necessary (before and after).
Completely loosen the chain tensioner. When looking at the saw from the sprocket side(bar to the right) the chain WILL travel clockwise. Fit the chain on the bar.(ensure that the chain travels in collation with the sprocket at the end of the bar if equipped). When looking at the saw from the sprocket side(bar to the right) the chain WILL travel clockwise. With the chain still in the bar, fit the 5 or so links in the sprocket on the powerhead, engage the bar with the bar nuts, then lastly engage the chain in the tensioner. Place the sprocket cover and nuts. Tighten nuts then loosen about .5 turn. Adjust chain tensioner. Retighten nuts. See that tightening the nuts made your chain tighter, loosen nuts readjust chain, tighten nuts. With gloves on and the chain brake disengaged please ensure the chain travels around the bar. Put on your chaps and start cutting.
Do you mean the chain won't move, or you can't get the blade off? The chain brake must be off to allow the chain to move. The chain brake handle has a housing that engages a gear attached to the chain brake inside the cover where the blade is attached. The brake must be off to remove the cover (usually held on by two nuts). The blade tension screw should be loosened to allow the blade to be removed, then retightened when replacing the blade. Tightening it pushes the blade out from the saw, so if it is tight, you won't be able to remove the blade. Hope this helps.
You must loosen the bar a tad. There is a nut on the side which will loosen the bar. Look for an adjuster screw near by. You should be able to move the chain by hand, snug but not tight.
WITH THE SAW OFF OF COURSE!!!!!!! Wear gloves to prevent injury.
Did you get a manual with your new saw? Of course you did. Please review the manual cover to cover before you continue to use this MOST DANGEROUS TOOL in most households. Few other tools are found in the home that will do as much damage as quickly as a chain saw.
Are you holding the nose of the bar up as you tighten the bar nuts?
You loosen the bar nuts and gravity pulls the bar down. You check the chain and the tension is correct, tighten bar nuts. Begin a cut and the bar slowly moves upward (no matter how tight the bar nuts) and the chain becomes slack. Chain adjustment
Make sure the chain brake is off (gloves will protest your fingers).
If necessary, loosen the bar nuts that are clamping the clutch cover in place (or whatever holds the clutch cover and bar on). They don't need these really loose - finger tight will do.
Ease the tension adjustment until the chain is obviously loose.
Using one hand, hold the nose of the bar up.
While holding the nose up, adjust the tensioner so that the center of the chain just touches the underside of the bar, add a touch more.
Continue holding the nose of the bar up & tighten up the bar nuts / bolts / quick-release system.
One more likely possibility, is the chain isn't being oiled. Checking chain lubrication Aim the tip of the bar at a light colored surface about 20 cm (8 inches) away. After 1 minute running at 3/4 throttle you should see a distinct line of oil on the light surface. HTH Lou
Near the back of the rear sprocket assy you will see a bolt facing forward. This bolt, when tightened, tightens the chain and visa-versa. To adjust the bolt, loosen the locking nut a just a little bit then adjust the bolt itself. It is best to make this adjustment while the rear wheel is off the ground, so you can spin the wheel and feel for chain tension. Once you have adjusted the chain tension to where you can just barely wiggle it 1/4" tighten the locking nut back against the frame. It is important to get this nut tight, as if it loosens, so will your chain.
Don't overtighten the chain as you will wear it out more quickly and wear down the sprocket teeth (expensive repair). Too loose and you risk a chain skip at high torque.
I did no find assembly instructions specific to this model. From what I see in pictures and descriptions it looks like a standard caliper brake on the front wheel. The knob/plug on the cable should fit into a groove and hole on the brake lever if the cable is slack enough to make the connection. You may have to loosen the cable tension nuts at the caliper and at the brake handle (labeled 1 & 2 in the instructions) to get enough slack.
Generic instructions are at:
See pages 21-23 for instructions about adjusting the brakes. You will have to do this after making the connection and it shows the various cable tension nuts that you can use to get enough slack in the cable to connect it. If you loosen the cable tension nuts (1&2) enough you should be able to remove the cable from the slot through the housing, expose the attachment slot in the brake handle by pressing it against the handlebar, insert the knob/plug into the hole and then work the cable back into the slot in the housing. Tighten up the tension nuts and make the final adjustments as described in the instructions.
OK. This is simple. Either the chain brake is engaged or the chain is too tight. Start by pulling back on the chain brake toward you. There should be a "click" if the brake was released. If the chain is still immovable, try resetting the chain tension.
1. remove the spark plug wire2. loosen the two clutch cover nuts3.hold the bar nose up and loosen the tension adjustment screw until the chain moves freely without becoming loose.4. tighten both clutch cover nuts with the bar held up.5. Pull the chain around the bar by hand. Loosen the adjustment if you feel tight spots.6. When the chain is properly tensioned,tighten clutch cover nuts securely. Do not overtighten!7. Check chain brake operation and release.8. Replace spark plug wire and operate saw. Hope this solution will Fixya.