My horizontal/vertical band saw is leaking oil at the drive wheel shaft. At the wheel side of the saw I can see the shaft passing through a bearing. This is where fluid is leaking from. On the gear side of the shaft I guess I have to remove that roll pin holding the gear to the shaft and I suspect I'll find some sort of seal there. How do I get that roll pin out? Is there a special tool for tight spaces like this in a gear box? The gear sits too far down in the gear box to get a punch on it. And finally, when I do get the gear off, will I find a seal that is replaceable behind that gear? I've attached a couple pics in case I'm not describing it correctly.
Leaking horizontal band saw
- Thread starter kaliona
- Start date
kazlx
Well-known member
I would guess the shaft would come out towards the gear box side, then you wouldn't even need to remove the gear. It most likely has a seal, but unless you have a parts diagram, you have to take it apart to find out what you need.
That appears to be the seal in the 1st picture. You should be able to use a pic or punch a hole in it to get a pic or seal remover tool in to pry it out. Then just slide a new on it. You need to inspect that keyway slot for any burrs that may be sticking up and file them down 1st. A parts diagram would confirm this as it's always hard to tell from a photo but that is where the seal should be, out board of the bearing.
One thing to think about. I had a similar issue with my HF version, where I thought there was a leak at the drive wheel bearing seal. Turned out to be a hole in the casting. Plugged it with JB weld metal epoxy, and stopped the leak. I did figure this out only after disassembling the entire gearbox. Food for thought.
Thanks for everyone's input. I was able to tap out the roll pin about a quarter inch then grab the end with vise grips and pull it the rest of the way out. Come to find out there's another bearing behind that brass gear. So the shaft passes through two bearings (a 6202LU and a 6202ZZ). Is the seal supposed to be made between the shaft and the bearing? No rubber? What should I do when I reinstall new bearings to ensure it doesn't leak again?
Why do you need new bearings? I thought it was just a leak.
Typically the seal goes between the shaft and the housing to seal the oil in the housing. The bearings are likely open to use oil in the gearbox for lube. There are sealed bearings that don't require lubrication but they are not used in an application like this that I can see.
You need to clean the area of the housing where the outer seal fits and you could put some silicon or gasket sealer on the surface. The rubber inner ring of the seal the touches the shaft should be lubricated with the same gear oil that goes in the case. You must make sure there are NO burrs or nicks on the shaft when installing the seal onto the shaft. Specially around key ways or the roll pin hole and the end of the shaft as you ease the new seal over it.
Typically the seal goes between the shaft and the housing to seal the oil in the housing. The bearings are likely open to use oil in the gearbox for lube. There are sealed bearings that don't require lubrication but they are not used in an application like this that I can see.
You need to clean the area of the housing where the outer seal fits and you could put some silicon or gasket sealer on the surface. The rubber inner ring of the seal the touches the shaft should be lubricated with the same gear oil that goes in the case. You must make sure there are NO burrs or nicks on the shaft when installing the seal onto the shaft. Specially around key ways or the roll pin hole and the end of the shaft as you ease the new seal over it.
I hadn't planned on changing bearings, but after disassembly I find there is no seal there with a rubber inner ring. . . just the two bearings. I figure the inner bearing must be the one that prevents the oil from leaving the housing but apparently its not because oil is getting passed that bearing, to the second bearing and then all over the drive wheel. And since I have everything apart I figure I may as well replace the bearings now. This saw was a garage sale find, rusty from sitting outdoors for a while. Was this designed to be a tight fit between shaft and bearing inner race creating the seal? Here's a pic. The bearing with the red face is the inner bearing. That along with the other (outer) bearing sit in that sleeve which sits in the bore of the gear box. Shaft slides through both attaching to gear on one end and drive wheel on other.
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rsanter
Well-known member
there is no seal...the bearing kind of is the seal
that type does not use oil it uses grease and what was leaking was the thin runny stuff from separated grease.
clean it up and install fresh grease and you should be good to go for a while
bob
that type does not use oil it uses grease and what was leaking was the thin runny stuff from separated grease.
clean it up and install fresh grease and you should be good to go for a while
bob