Husqvarna 455 rancher, chain getting too loose to tighten after one days use age. Bar oil topped off with every fill up of gas. Bar cleaned in the groove, etc. New chain. The bar will no longer adjust to fit the chain in just one day with a new chain. Everything was cleaned out before putting on new chain. In fact, half of the space for adjusting the bar, was already used to put on the new chain.

SOURCE: husqvarna chain saw, model 455 will not oil properly bar and chai

hi cindilou50
check the oil filter from the oil tank,the oil line ,the worm gear and the oiler under the clutch.Clean the ways where the oil goes with compresed air.(after you fill out the oil tank)Also check the oil hose.

best regards savumihai71

SOURCE: Iuses a brand new 455 farm Boss for the first

There are burrs on the drive links, this shows the easiest way to remove them.
http://www.fixya.com/support/r4146814-chainsaw_chain_installation

If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou

SOURCE: Chain is not getting oil. 3 hours on new 455

I saw many issues with the oiler on this model, the oil pump itself never goes wrong, there was a later filter as the original was too fine and would not allow sticky oil through, there was also issues with the oil pipe kinking and not allowing oil through, there was also a mod to increase the oil flow,it meant removing the oil pump shaft and increasing the throw by grinding the back of the pump shaft, if you have cleaned the externall oil ways and the problem persists,then it does lie deeper, you could try to thin the oil out and try again, if no better this will be a shop job. If you feel you could do it yourself, let me know and i will try to go through the mod with you.

SOURCE: I have a Husqvarna 455 rancher that has stopped

Most 455s have a three position oil pump, the adjuster is a slot head screw acessed through the bottom of the crankcase, try increasing the flow first, if no better, you need to remove the clutch and sprocket to gain acess to the pump, the oil pump drive gear is nylon and driven by the sprocket, check this is in good condition, behind the pump is a pick up pipe that pushes into the tank via a moulded grommet in the pipe , gently lever this out of the tank,on the end is a filter. if you are brave enough you can increase the throw of the pump shaft by grinding a steeper angle on it, but this is a skilled job and a last resort, i have had to do a few where they are running longer guide bars and need more oil, let me know if you need more help.

SOURCE: loose chain

if you have atleast 1/8" of teeth still on chain .take a link or 2 off good to go saved you beer money.