Bob95065
Super OPE Member
- Local time
- 7:19 AM
- User ID
- 2097
- Joined
- Nov 7, 2016
- Messages
- 170
- Reaction score
- 357
- Location
- Felton, CA
I posted last summer about a 562XP failure that I experienced in this thread: Husqvarna 562XP - A Tale of Woe. In a nutshell it experience lean seizure and I put that project down.
Yesterday I got a wild hair to pull the crankcase apart mostly because I got sick of seeing that box of parts in my garage. Once I got the crankshaft and seals out I found the smoking gun:
Look at the bottom of the bearing for a larger gap than the rest of the balls are spaced. Ignore the oily thumb and fingers:
Very easy to see what happened when the bearing was pressed off the crankshaft:
I hate, hate, hate plastic caged bearings and this is why. I started reading up on these saws and it seems like those nylon cages are a weak link which doesn't surprise me. The thing that is surprising is the failure occurred on the flywheel side bearing. I expected the PTO side to go out first.
What happened here is I put the saw back together and did a pressure/vacuum test and it passed. Only when I put a chain with load on it did the crankshaft go eccentric with respect to the seal which caused an air leak. The carburetor tried to compensate by enriching the mixture which masked the problem to the operator (me). When the saw stopped running it was too late.
Does anyone know if steel-caged bearings are available for these saws? I haven't found anything but thought I would ask. If metal caged bearings aren't available I think there may be a market for them but the sales volume may not be adequate for a productions run.
To make it worse this is a 2019 model and from what I read the flywheel side bearing was redesigned which may make it hard to find a replacement. The bearings I found were pretty spendy for a bearing.
I really want to like this saw but Husqvarna is making it difficult for me to do that. I really like my old equipment that used 6202 bearings that are easy to source and are constructed to last.
Bob
Yesterday I got a wild hair to pull the crankcase apart mostly because I got sick of seeing that box of parts in my garage. Once I got the crankshaft and seals out I found the smoking gun:
Look at the bottom of the bearing for a larger gap than the rest of the balls are spaced. Ignore the oily thumb and fingers:
Very easy to see what happened when the bearing was pressed off the crankshaft:
I hate, hate, hate plastic caged bearings and this is why. I started reading up on these saws and it seems like those nylon cages are a weak link which doesn't surprise me. The thing that is surprising is the failure occurred on the flywheel side bearing. I expected the PTO side to go out first.
What happened here is I put the saw back together and did a pressure/vacuum test and it passed. Only when I put a chain with load on it did the crankshaft go eccentric with respect to the seal which caused an air leak. The carburetor tried to compensate by enriching the mixture which masked the problem to the operator (me). When the saw stopped running it was too late.
Does anyone know if steel-caged bearings are available for these saws? I haven't found anything but thought I would ask. If metal caged bearings aren't available I think there may be a market for them but the sales volume may not be adequate for a productions run.
To make it worse this is a 2019 model and from what I read the flywheel side bearing was redesigned which may make it hard to find a replacement. The bearings I found were pretty spendy for a bearing.
I really want to like this saw but Husqvarna is making it difficult for me to do that. I really like my old equipment that used 6202 bearings that are easy to source and are constructed to last.
Bob
