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I’ve got an old obsolete pump, parts not available to replace. It needs a he current bearing removed and a new one pressed in.
what sort of bearing pulled do I need to remove this;
The central brass cylinder rotates in the bearing and it has coverts it rotation force into pushing / pulling a piston at the other end of the gearbox casing. I’ve no access to the other end of the cylinder from the other end of the casing so cannot knock it out.
I need to get a puller into either the bearing race to extract the bearing or something to go down the central hole and hook on the furthest edge and pull the cylinder out. Cylinder is ~ 45mm diameter for reference and at least the same deep.
Thanks
What diameter is the central hole?
Do you think a blind bearing puller might work?
Do not take this to heart.
Nah bollocks you can't get the shaft off you just haven't figured it out. Go away and have a good think because there's no way that started life in that configuration. Split a case or whatever and the shaft will be able to be extracted. Not necessarily easy but there's always a wayyl.
You can get pullers that lock into the gap in the bearing between the balls - no idea what they are called
Two mins on the net found this - this sport of thing
https://www.penntoolco.com/simatec-simatool-ball-bearing-puller-310-1210-bp-61/
If it's a blind hole, keep stuffing wet tissue inside and packing it down with a punch and hammer. Enough tissue and hammering will drive the bearing out.
If it's not a blind hole, probably don't do that. I'd imagine a gearbox full of wet tissue isn't what you want.
A blind bearing puller with a slide hammer is probably the best thing. The type with a split collet that inserts inside the inner race and then expands as you tighten it.
Something like this https://www.kineticbikebearings.com/slide-hammer-bearing-extractor-tool-with-9-expanding-collet-attachments2.html
Anybody else see anything wrong with the above picture?
I would make a tool out of some 4mm flat plate . 10mm threaded bar , 4 x 10mm nuts .
Then you need a 12mm rod which you make into an arrowhead and a couple of 12mm nuts.
As above - it will be possible to disassemble further..... unless the laws of physics have been overcome?
If you really have to keep it assembled then it's blind bearing puller time but they aren't capable of much pull so you're going to need lots of co-effecient of expansion (lots of heat into the casing).
Worst case scenario is a 9" grinder cutting through the thin outer section of the casting and then the outer and inner bearing races. You'll then need a reinforcing section designing/Lasered/machining that picks up on those two bolt holes to reinforce the split in casting you've just cut through. It would make bearing changes quicker next time.
Or cut the whole thing off and CAD / laser a plate that bolts to the casting on the area that is out of photo, pick up on the centre line of the shaft but use a flanged bearing instead.
However the easiest thing is to Capex a new pump and bollock who ever made you use an obsolete knackered bit of kit.
* I have Solidworks, a massive manual turret mill and lathe, 24hour turnaround laser and machining contractors at my disposal for this sort of thing. I also have an expensive SKF hydraulic bearing puller kit which is handy for stuff like this.
Is that hole in the middle of the rotating cylinder critical to the function? Could you thread it and use a slide hammer/puller to extract, then a normal 3 leg puller should get the bearing.
Oh hang on, I can see a keyway in the bore on a proper monitor. Scratch my suggestion.
Thanks all - the gearbox is one piece cast alloy an further disassembly is not possible. It is a terrible design and clearly not designed with maintenance in mind.
The central hole is circa 10mm diameter not including keyway and the brass cylinder is circa 60mm deep measuring with a spoke.
The embedded bearing puller looks like it might be worth a shot. Thanks
Blind hole bearing puller?
Anybody else see anything wrong with the above picture?
Looks like it will work, the screw just needs a solid support to rest on. Already missing some balls so won't have trouble in that respect.
Forgot those pullers existed when I wrote my previous reply, used similar to extract valve seats from cylinder heads IIRC.
@bens how much??!? I paid a fifth of that for mine and it breaks something every time it's used. I wouldn't pay that for anonymous unbranded chinesium crap.