As i saw the timer i wonder what is the use of that adjust around the timer..as i saw the model of the timer

Make sure chain tension on the bar is correct and then the 2 nuts holding the bar is correct, Youtube has alot of videos on how to set chain tension as well as the Oregon website

Most saws are preety standard, pull the hand guard fully back to the top handle to ensure the brake is off, take away the cover nut/nuts, wind the chain adjuster fully back, now remove the side cover, loop the chain over the nose of the bar, and then loop it over the sprocket and off the saw, the bar will now lift away, to refit, place the bar back onto the bar bolts, push it fully back toward the sprocket, loop the chain over the sprocket and lay it around the bar ( the cutters on the top of the bar should be facing away from the saw ) if the adjuster is in the crankcase make sure it locates into the hole in the bar, now refit the side cover, if the adjuster pawl is in the side cover make sure it locates into the bar hole, refit the bar nut/nuts finger tight, adjust the chain so as it touches snuggly all around the bar, with a gloved hand pull the chain around the bar to make sure it is located into the sprocket correctly, re adjust if required, now fully tighten the bar nut/nuts.

1) Paragon no longer makes timers and parts, except defrost timers.
4014-20 is not defrost timer
http://waterheatertimer.org/Paragon-timers-and-manuals.html#Paragon4000

2) 4000 series uses X2772 tripper
Google search for this product shows these trippers selling for 50-60$

3) Intermatic cross-reference chart shows T104R 240Volt raintight is replacement
http://www.intermatic.com/customer%20service/competitive%20cross%20reference.aspx
I saw T104R at Lowes today for around 90$

4) How to wire T104:
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html

5) Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, fixya expert speaks with you over phone while you work on timer.
We are always less expensive than a service call.

go to Makitatools.com and type in your model number and click on the owners manual section, on page 18-19 it gives instructions on how to set the fence and that should solve your problem. If I have helped you with your request would you please rate this response accordingly. Thank you.

remove the nuts that hold the bar & the screws that hold the cover on.w/ brake off,remove cover.inside cover you will find 'band' brake that surrounds sprocket assembly.if adjustment is provided,it will be at one end of the band.it's more likely to be an accumulation of sawdust interfering w/brake.also clean sawdust from chain oiler holes in bar,and around sprocket while you've got it apart.slacken chain adjuster screw to aid re-assembly,re-adjust chain

You do not mention the model number.
Honestly, I had never used a pole saw, but I needed to cut down a lot of tree branches and Black+Decke worked wonderfully. With it being cordless I could easily walk around my entire yard without worrying about it. The chain does loosen after cutting through several limbs, but it's super easy to tighten back. It's easy to assemble.
More details Practical Black and Decker Pole Saw Review

Chain is probably stretched. SAFETY FIRST. Electric saw, make sure power is unplugged. Gas saw, make sure sparkplug wire is removed. Remove the cover where the bar is attached to the saw. U should see an adjustment screw for chain tension and one or more bar lockdown screws. Loosen the lockdown screws and turn the tension adjustment screw to permit the bar to slide back toward the motor. Put the chain back in the bar track all the way around. Adjust the tension screw to tighten chain enough you can't pull it out of the track at any spot. Slide the chain by hand at least one complete revolution feeling for any rough spots. If it moves freely, turn the tension screw enough to tighten the chain properly. Correct tension should allow you to pull the chain appx. 1/16 to 1/8 inch from the bar. Tighten the lockdown screws, replace the cover. Rotate chain by hand a couple of revolutions again to check for smoothness again before starting the saw.

With saw unpluged!!!!! open top wheel gaurd.Spin wheel by hand while moving the adjuster knob on back of the machine. As you turn both at the same time the blade will trac either the front or back of the wheel. Move the knob (while spinning the wheel) until the blade is tracking in the middle of the tire. (rubber strip around the wheel)