Leaking gear box

[mike os]

No seal on the outside of the bearing?

 

[Jacktegla]

No seal on the outside of the bearing?

No not on the inside. Could I make one out of something ?

 

[8ob]

Jack is that "the saw"? you can always use groil, a cartridge of grease and then top up with oil.

Bob

 

[Jacktegla]

Jack is that "the saw"? you can always use groil, a cartridge of grease and then top up with oil.

Bob

Yes its the saw, what is groil? Do you think if i just packet the bearing with grease it would work.

Here's a few photos of it so far. Its not quite that bright in real life.

 

[8ob]

Jack looking at that hub I would say there should be an O ring in the groove on the outer case to stop oil running along the outside of the hub, there must also be a seal on the bearing behind the blade flange. You could check the one behind the flange by filling the hub on the bench and putting the gear back on a bit quick. The two squares on the outer case are probably for somewhere a two legged puller locates for pushing out the spindle.

Bob

 

[daedalusminos]

I agree with @8ob that central shaft should push out - there's probably two taper bearings and the nut sets the pre-load. Have you tried tapping the central shaft with a soft blow hammer? Looks like you have an o-ring in the outer groove - always a good idea to replace but I suspect this is leaking through the bearing race and there should be another seal between the blade flange and outer housing - potentially just felt.

 

[Jacktegla]

Jack looking at that hub I would say there should be an O ring in the groove on the outer case to stop oil running along the outside of the hub, there must also be a seal on the bearing behind the blade flange. You could check the one behind the flange by filling the hub on the bench and putting the gear back on a bit quick. The two squares on the outer case are probably for somewhere a two legged puller locates for pushing out the spindle.

Bob

Thanks for that. I have replaced the outer o ring. I have tried that on the bencb filling it up and it does t por ont straight away, it leaves a minute or two, so that's why o thought its leaking through a seal. So you think I should try a puller the blade flange . Thanks

 

[Jacktegla]

I agree with @8ob that central shaft should push out - there's probably two taper bearings and the nut sets the pre-load. Have you tried tapping the central shaft with a soft blow hammer? Looks like you have an o-ring in the outer groove - always a good idea to replace but I suspect this is leaking through the bearing race and there should be another seal between the blade flange and outer housing - potentially just felt.

I have tried tapping it but when I do, all the energy is lost through the beafings as the inner seems to move up and down slightly. I have reached the o ring. If I puller it apart would the bearings have to be replaced?

 

[8ob]

If it’s anything like a stub axle it should press out, holding the outer hub is going to be the challenge. A puller that fits the two squares on the outer hub would be the way to go. If using a puller or press the bearings will be fine, start beating the crap out of it perhaps not.

Bob

 

[Agroshield]

They look to be angular contact bearings so be careful.?.

Interested to hear your logic on that statement.

The bearing shown clearly has rollers as its rolling elements. I was under the impression that angular contact bearings always used balls as rolling elements.

Also, angular contact bearings are used when there is both axial and radial thrust. On a saw, where does the axial thrust come from that requires an AC bearing?

 

[mike os]

Interested to hear your logic on that statement.

The bearing shown clearly has rollers as its rolling elements. I was under the impression that angular contact bearings always used balls as rolling elements.

Also, angular contact bearings are used when there is both axial and radial thrust. On a saw, where does the axial thrust come from that requires an AC bearing?

Rollers appears to be angled in pics ... may be optical illusion

 

[mike os]

Actually taper roller vearings