Profanity & nylon caged bearings...

[afleetcommand]

Inspired by the "profanity" rules and regulations thread designed to set a precedence...

And got into two Husqvarna 550's with lean conditions. Both have at first what looked to be clutch side seal failures...and after tear downs reviled wasted bearings where the crumbling nylon cages gored the seals...hence lean condition. Now a 6202 sealed bearing is close to the size of that bearing..its a little narrower. ANY one know of a steel caged alternative to OEM Husqvarna bearings for the 550's???? What about the Flywheel side with the extended inner race for the seal?

Posted a pic in the "whats on your bench"

 

[afleetcommand]

 

[psuiewalsh]

Have you tried vbx.com. I have gotten bearings from them in the past.

 

[wcorey]

I've seen failures with both types of cages, I'd take the damage done by the plastic ones over steel anyday...

 

[Czed]

I've seen failures with both types of cages, I'd take the damage done by the plastic ones over steel anyday...

+1That's what I've seen and heard.

 

[Tor R]

There is nylon in flywheel bearing also but it seems it last longer compared to the PTO bearing, my theory is that dull chain kill them more often etc.
545/550 got new bearing kit summer 2016.

We rarely hear about 545 bearing issues, but its the same bearing 550 has, maybe those crank stuffers reduse the oil for the bearings?

If bearings doesnt get oil enough Im for the nylon bearings all the time, less damage when they blow!!
That said, 242 bearings could take lots more beathing/heat compared to 346/545/550

 

[Al Smith]

If bearings doesnt get oil enough Im for the nylon bearings all the time, less damage when they blow!!/ Note the key word--oil----

 

[afleetcommand]

Like this? Seen a couple of XT's like this now.. CLutch side. And the nylon was crumbling...almost brittle.

 

[afleetcommand]

Couple like this as well... (562's) Also clutch side....also with nylon that crumbles...not ductile at all

 

[wcorey]

heat + ethanol?

 

[afleetcommand]

Wish I knew!..... On the XT's I've been using "Nachi's", some have been out in logger land for a couple of years with no issues.....
It LOOKS like heat related degradation.....but I don't know enough about the materials and their performance envelope. BUT its a trend...

So I just want a steel option.. Just a hobbyist

 

[Tor R]

Husky has reduced production cost compared to the 3xx, going cheap isn't always smart, and their quality control isn't superb, Husky has updated their bearings twice since 550 came, when they update bearings and crankshaft so often, it tells us that they have problems to sort out those issues.

There isn't any chance that the flywheel bearing is stronger then PTO, when PTO get toasted before the other one it mostly due heat and power on pTO side.

I've started to purchase the new Husky alcylate fuel and their oil and will run my saws on 40:1 mix.

 

[Simondo]

Wish I knew!..... On the XT's I've been using "Nachi's", some have been out in logger land for a couple of years with no issues.....
It LOOKS like heat related degradation.....but I don't know enough about the materials and their performance envelope. BUT its a trend...

So I just want a steel option.. Just a hobbyist

Firstly...My name is Simon and its good to see you posting on OPE . I have enjoyed yours and Bobs vids a lot, both finding them very educational and entertaining.
Iv just got off the phone with a customer and friend who after less than 10 logged HRS on his 2016 550xp had to return it after it stopped dead while cutting. He was running the saw on 50.1 husq full synth 2 stroke oil and fresh gas mix along with one other 560xp (2013) and a 346xp NE. The dealer found a full clutch side bearing brake up (nylon cage sort). Crucially...the top end was spotless with no scoring ! We both get our gas from the same filling station and in the UK ..Most ..fuel is 10% MAX or NO ethanol unleaded. The saw was fixed under warrantee and he will carry on using it with the hope all will now be well .

 

[Mastermind]

I've fixed two blown PTO bearings in Husky Autotunes over the last couple of weeks.

Dammit

 

[afleetcommand]

On 562's I have an opinion, not fact; on what and how to help. I think it is heat. They intentionally (same as a lot of later designs) trap exhaust heat for efficiency purposes. The way those transfers wrap around the exhaust & the way the mufflers baffles deflect the exhaust down to the bottom of the muffler. To the rather uneducated eye..it looks like a design trend. SO on the 562's I've done a couple of things to get rid of heat as a priority vs. power....first open the hole in the baffle directly in front of the exhaust port, leave the baffle in, and open up or add an exit. Also on the older ones, cut the top cover similar to the new ones to let more heat out the clutch side. SO far the non contact thermometer says there is a difference....enough to notice, not enough for me to post as absolute fact. Also have always run a heavier oil mix hoping the more lubrication offsets the slightly higher combustion temp. One of the posters here mentioned the stuffers....I also have noticed I've yet to see a 555 or 545 with an issue. Does that lower primary compression along with large case volume flushes & carries oil around to the bearings better?? Maybe cools better? I don't know...but it might. I still want a steel option! AND I notice Stihl has used nylon for years with no issues AND the new OEM replacement cases from Husqvarna come with nylon. I used them on a 372xpw two years ago..its doing fine. Also for completeness of thought acknowledge the fact that there are many 562's & 550's doing just fine and nylon doesn't guarantee failure. Since they all are..nylon, thats all I'm going to see!

 

[Adirondackstihl]

So I just want a STIHL option..

Solved your problem!

 

[wcorey]

Here's an original owner ms260 I picked up cheap because it was seized, was a clutch side failed plastic cage...

 

[Adirondackstihl]

Here's an original owner ms260 I picked up cheap because it was seized, was a clutch side failed plastic cage...

View attachment 53752

I've yet to see sumpin like that in any brand of saw.
Surely it must be a lubrication (lack thereof) issue. But the case looks good n oily

 

[wcorey]

I've yet to see sumpin like that in any brand of saw.
Surely it must be a lubrication (lack thereof) issue. But the case looks good n oily

P&C looked good. The owner was very curious what could have happened so I pulled the muffler to show him the scoring and was surprised to see the nice clean machine marks still on the piston.

 

[Adirondackstihl]

Wonder if he ran it with brake engaged or crazy dull chain repeatedly?