Profanity & nylon caged bearings...

[afleetcommand]

agree, but.......5xx serie saws is far more compact.
If we take 346 and 550 as example Husky managed to shave of the crank and they managed to get space for stuffers, impressive by itself, but it may reduse the chance to get rid of heat a tad, that is how I think.

You can blame a CAD & FEM package on that, something like PTC, Catia, of some such deal where solids and interference analysis through booleans allow some really tight designs in 3-d space.....then the reliance on the equally sophisticated FEM packages to do heat and heat transfer analysis. Problem with those things is trying to see ALL the special conditions when setting up those models.... Still ends up being an iterative process, often when market & financial pressure prevail, in the customer base. AND the more complex the shapes...the harder it is to model accurately.

 

[Onan18]

You can blame a CAD & FEM package on that, something like PTC, Catia, of some such deal where solids and interference through booleans allow some really tight designs in 3-d space.....then the reliance on the equally sophisticated FEM packages to do heat and heat transfer analysis. Problem with those things is trying to see ALL the special conditions when setting up those models.... Still ends up being an iterative process, othen when market pressure prevails in the customer base.

My head hurts after reading that post.

 

[Spike60]

You can blame a CAD & FEM package on that, something like PTC, Catia, of some such deal where solids and interference through booleans allow some really tight designs in 3-d space.....then the reliance on the equally sophisticated FEM packages to do heat and heat transfer analysis. Problem with those things is trying to see ALL the special conditions when setting up those models.... Still ends up being an iterative process, othen when market pressure prevails in the customer base.

See what I mean? The smartest "farmer" among us.

 

[huskihl]

My head hurts after reading that post.

 

[afleetcommand]

See what I mean? The smartest "farmer" among us.

Just some mental static that hangs around from a distant past...

 

[Tor R]

Late 2015, they made a change on the bearings and crankshafts on all of these saws, including the 545 and 555. They listed the reason as "improved grip". They also changed the pistons, ("profile and ovality") and needle bearings at this time. So............

A, they're not afraid or unwilling to make improvements.

B, they didn't feel that the plastic cage was an issue, or that would have been part of the correction.

The cage may be "what goes", and that's what we see when we tear the saw down. But the cause could well be something else. When a metal cage fails, we don't blame the metal.

I think Husky has introduced a new bearing kit in 2016 also Bob, at least they did for 550, week 31

 

[afleetcommand]

My bet it the engineers are "motivated" to adjust things they can control in house first before tinkering with a supply chain. Minor tweaks to the dimensions of "machined" parts is simple in the CAD/CAM/CNC world. Even if those parts are built on dedicated machines requiring fixed tooling...or sections of a die or mold modified. Supply chain's have this "momentum" thing, as parts are scattered throughout the manufacturing and repair supply chain ...so if they can figure out ways to solve an issue without messing with that...my bet is they will... Just an opinion. Don't really know how they think or operate.

 

[Spike60]

I think Husky has introduced a new bearing kit in 2016 also Bob, at least they did for 550, week 31

Good job Tor. I just went in and found that. Wasn't on the usual IPL update tab. It lists the reason for the bearings being "improved durability", so they are working on this stuff. What I'll do Monday is order them and see what they look like. Any bets on plastic vs metal?? My guess is that it will remain plastic, as only the last digit of the bearing part number is changed.

If it's metal the farmer/engineer will really get the last laugh. And I'll find out what nylon cages taste like.

 

[Mattyo]

No more proprietary bearing saws for me.... to own at least. Forget that.

 

[Mattyo]

See what I mean? The smartest "farmer" among us.

just because he is adept at the gift of gab and baffling us with bologna .... well... ya... you get the idea

 

[Onan18]

No more proprietary bearing saws for me.... to own at least. Forget that.

Selling the 385?

 

[Tor R]

Good job Tor. I just went in and found that. Wasn't on the usual IPL update tab. It lists the reason for the bearings being "improved durability", so they are working on this stuff. What I'll do Monday is order them and see what they look like. Any bets on plastic vs metal?? My guess is that it will remain plastic, as only the last digit of the bearing part number is changed.

If it's metal the farmer/engineer will really get the last laugh. And I'll find out what nylon cages taste like.

my bet is nylon cage
Haha didnt take long time before you swiped your card to check out how the new bearings look, thats cool Bob!

To be honest about those 5×× serie saws, I pick up toasted 550 XPG's from one of the bigger seller in Norway, over 50% of their sale is 550, what have I got from them in one year? 6-7 550's, and those is probleby waranty cases for at least 2 years. Only one had blasted PTO bearing, one had flywheel seal leak, the other ones had blasted conrod bearing.

 

[Simondo]

Point 1....the specs on the nylon cage= what operating temp are they designed for?
Point 2...on install (ether at factory or renew at dealer) do Husq use heat to install the bearings?
Point 3...what are you all seeing at fail ..melt..crumble..chunks of the cage ?

 

[Simondo]

My head hurts after reading that post.

Basically ...design and test as best you can.....then get on and field test to knock out the bugs that dont show on a test rig. IE...get it used in the real world .... then update your product to cope . If iv got the gist of the meaning

 

[Mattyo]

Lookie what I just found...

Thanks to Derf for pointing it out...

https://www.jackssmallengines.com/jacks-parts-lookup/part/poulan/525434201

Looks like the same bearing....just cheaper..no?

Selling the 385?

Yep...gonna sell it

 

[mdavlee]

The 385 you can buy the seal separate and use a bearing of choice. It's not a fun seal to install. A lot of husky bearings and seals can be bought cheaper as Poulan parts.

 

[Mattyo]

I have to disagree. the bearing is special I have never found its equal on the market.

http://www.arboristsite.com/community/threads/385xp-bearings-alternatives.267971/#post-5077731

forgive me mdavlee... i forgot you were part of that thread... I'm rereading now lol

 

[afleetcommand]

These look similar dimensionally to the 6202. ( I didn't measure yet!) Just a bit wider. Like the clutch side bearings on the 576's as well. Thought for a split second about pulling a seal off a "sealed" Nachi 6202...they are a little thinner, nothing a shim couldn't fix, maybe a shim that spaces the bearing and extends to support the seal? Problem is those bearings seals were designed to handle pressure from the out side of the bearing, and not from the inside out. With crank case pressure I suspect those seals would be pushed out of the typical sealed bearing. Probably why these Husqvarna sealed bearings are a bit wider as they are designed to handle the pressure from the "ball" side of the bearing. Of course leaving the "inside" seal would deprive that bearing of lubrication. Maybe there will be enough demand for an AM bearing set.. Also the supply options are limited it seems, a possible explanation why Husqvarna does other things to tweak the design. Cost reduction might have been the goal...instead of two parts, a one part "integral bearing/seal" design. Just a suggestion...don't know for sure.

 

[Mattyo]

Seems to me like the goal was to either force dealer support or force sale of new saws...because replacing even that single bearing would be cost prohibitive. Either way it's a deal breaker for me. I don't care how good these saws are....they aren't for me if they have a bearing configuration like that.

 

[afleetcommand]

Doubt that, suspect trying to be more quite, a little space savings, along with less parts. Nylon when a little "ductile" will dampen some vibration & therefore noise.