Getting the bearing out

   / Getting the bearing out #1  

flyerdan

Veteran Member
Joined
Aug 9, 2011
Messages
1,728
Location
Salem, OR
Tractor
Hyster H50 Bobcat M700
Not tractor related, but since we don't have a tool thread and since this is where the HF thread is...

Picked up a B&D 7613 type 4 router that has a bit of play in the lower bearing. There is a formed nut holding the armature against the bearing, which is secured from inside the spider. The nut is recessed, and there isn't room to get anything on it to hold onto it.

IMG_20200110_163750.jpg

It looks like it's 7/8"; I suppose I could turn down the end of a socket and hope it holds together, or hog out some of the plastic around it and hope that it leaves enough meat so the bearing seat is not compromised.
Normally I can whip these kinds of problems; I imagine that they have a special socket to install these so they aren't user friendly. I've already gripped one side with a very thin set of pliers, it's on pretty tight. Any ideas appreciated.
 
   / Getting the bearing out #2  
Could you put a thin chisel or a screw driver against the edge of the nut and tap it. Often to get a stuck nut going in a tight area I will do this. Once it free you can then spin it off by hand.
 
   / Getting the bearing out #3  
Not tractor related, but since we don't have a tool thread and since this is where the HF thread is...

Picked up a B&D 7613 type 4 router that has a bit of play in the lower bearing. There is a formed nut holding the armature against the bearing, which is secured from inside the spider. The nut is recessed, and there isn't room to get anything on it to hold onto it.

View attachment 636428

It looks like it's 7/8"; I suppose I could turn down the end of a socket and hope it holds together, or hog out some of the plastic around it and hope that it leaves enough meat so the bearing seat is not compromised.
Normally I can whip these kinds of problems; I imagine that they have a special socket to install these so they aren't user friendly. I've already gripped one side with a very thin set of pliers, it's on pretty tight. Any ideas appreciated.

Buy a cheap deep socket and turn or grind it down till it fits. ( than use an impact if you have one )
 
   / Getting the bearing out #4  
either one of two, either the socket they use fits inside the nut, or the socket they use don't have material where the points of the nut are, which just leaves fingers turning the nut. it appears to be a formed steel nut, not available anymore. #62 on the diagram. you'll have much better luck here. Router Forums - Router Forums
 
   / Getting the bearing out #5  
How about doing the 'double nut' on the shaft itself?
 
   / Getting the bearing out #6  
I worked in an electric motor shop for 30 years, but not on motors that small. Most have a bearing cap on the inside to capture the bearing in the housing. I would take the two screws on either
side of the shaft and see if that lets the housing slide off of the bearing. It may not come easily but don't get too western with it that you break it! That should leave you with the bearing exposed and full access to the hex nut.
 
   / Getting the bearing out #7  
I worked in an electric motor shop for 30 years, but not on motors that small. Most have a bearing cap on the inside to capture the bearing in the housing. I would take the two screws on either
side of the shaft and see if that lets the housing slide off of the bearing. It may not come easily but don't get too western with it that you break it! That should leave you with the bearing exposed and full access to the hex nut.



I my thought too... Can hurt anything to try...

Dale
 
   / Getting the bearing out #8  
With your calipers, find a nut that would fit snugly inside that formed nut,
Clamp the nut in your drill press and drill out the I.D. until it will slip over the shaft.
Slide the drilled out nut over the shaft and press into the formed nut.
Remove with a deep socket.
 
   / Getting the bearing out
  • Thread Starter
#9  
The fan, which is bonded to the armature, is immediately behind the plate, so there is no way to get to the back side of the bearing without the formed nut coming off first. There are no utube vids or anything I can find regarding this. Apparently B&D considers this a disposable item.
I'm going to try a chainsaw sparkplug wrench if I have one in that size. I suppose if worst comes to worst I can cut it off with a Dremel skinny wheel and make another with pin holes, like a grinder has. Don't want to go to that much trouble though.

The sparkplug wrench worked; it was one that came with a HF chicom engine, but it took it right off. Didn't need an impact, it wasn't on that tight, put the wrench in the vice and turned the armature. The bearing was stuck to the shaft pretty good, but the smallest of a HF 3 jaw puller got it off without damaging the plastic.

IMG_20200111_125155.jpg

Now the problem appears to be that the bearing is good, but the play is from the pocket being wallered out a bit, the bearing fell right out when the snapring was removed. I need to check my brass shim material and see if I can make a foil band to take up the slack.
 
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