Bobcat 15C auger seals.

[mogman]

Bobcat sent me this "schematic" of my #15C auger, there is a bad leak coming out of the seal around the output shaft.
I am thinking the seals in the motor not shown are where the leak must be originating, does this seem reasonable, if so when I break it down will there be a data plate on the motor I can use to acquire the seals I need?
I can use it now and I do not want to have it down too long as this is fence building weather.

 

[mogman]

I think what happened is because I plugged the hoses together to help with exposure of the couplings so I dead headed the motor and the heat built up pressure and blew out the seals

 

[mogman]

Bobcat just answered me and gave me a part # SEAL KIT, 7003642 for the motor, not in stock

 

[wateka]

I've got a generic auger, so this grabbed my attention and made me wonder about my own unit because I like the idea of connecting the couplings to keep dirt out. What I can't figure out is how connecting them would have allowed any change to the pressure inside the unit because the couplings are sealed to begin with. If you find another culprit when you tear the motor down, holler back. Thanks.

 

[mogman]

I've got a generic auger, so this grabbed my attention and made me wonder about my own unit because I like the idea of connecting the couplings to keep dirt out. What I can't figure out is how connecting them would have allowed any change to the pressure inside the unit because the couplings are sealed to begin with. If you find another culprit when you tear the motor down, holler back. Thanks.

I thought about that also, when I get it repaired I am going to use an old leaking female connector with a plug in it to keep the pressure from building up, that is the only thing I can think of that would have caused this failure, worked fine all along then the next time I used it it leaked like a sieve.

 

[mogman]

I finally got it apart, is this the seal I need to change or is this chamber supposed to be wet and there is another seal in the lower housing???

 

[mogman]

I've got a generic auger, so this grabbed my attention and made me wonder about my own unit because I like the idea of connecting the couplings to keep dirt out. What I can't figure out is how connecting them would have allowed any change to the pressure inside the unit because the couplings are sealed to begin with. If you find another culprit when you tear the motor down, holler back. Thanks.

Yes it would be dead headed ether way as the couplers seal themselves, so as far as that goes it would be no different if they were connected together or not.

 

[mogman]

I finally got it apart, is this the seal I need to change or is this chamber supposed to be wet and there is another seal in the lower housing???
View attachment 7488View attachment 7489

To answer my own question yes that area should be wet and the seal(O-ring) and seal backup (costs twice what the O=ring costs)
and the large O-ring sealing the two bodies is what I need, not too bad $60-$70 @BobCat

 

[mogman]

It was definitely just a BAD seal.
Now I have to figure out what I have as there was by serial number supposed to be an O-ring and a spacer here but this is clearly a Teflon seal with spring, also by serial number the seal groove should be .210" but I measure .420" so projected costs are now up in the air.

 

[mogman]

Evidently someone had to replace the lower housing as it appears to have a "middle" run housing, and I have an "early" run machine, this makes perfect sense now, my unit was a retired rental unit from one of the well known equipment rental companies.
Looking at the exploded view whomever replaced that housing put it back together with the hoses 180 deg. out, making the hoses exit the right side of the unit rather than the left side which is where the hydraulic connections are on most of the Bobcat skid loaders.
This has caused me MUCH grief over the years, getting the hoses pinched with great ease.
Well at least I can remedy that situation

 

[mogman]

Evidently someone had to replace the lower housing as it appears to have a "middle" run housing, and I have an "early" run machine, this makes perfect sense now, my unit was a retired rental unit from one of the well known equipment rental companies.
Looking at the exploded view whomever replaced that housing put it back together with the hoses 180 deg. out, making the hoses exit the right side of the unit rather than the left side which is where the hydraulic connections are on most of the Bobcat skid loaders.
This has caused me MUCH grief over the years, getting the hoses pinched with great ease.
Well at least I can remedy that situation

 

[mogman]

One thing that tee's me off about Bobcat is they do not supply information about their hoses.
Every JD piece of equipment I have you can go into the parts manual and get the length and type of connectors.
If there is anyone out there with a 15C can they measure the hydraulic hose length??
Since my auger was put together "backwards" I am not sure I have the stock length hoses.
Thanks

 

[mogman]

Well I have it all ready to go back together, I was thinking at first that someone got the motor turned 180deg out in the housing and that is why my hoses came out on the wrong side, BUT NO!! they got the whole ass turned 180deg, this meant that the only drain hole at the bottom of the housing was now a rain catcher and there was no way for the water to drain out.
here is a picture I found on the web of two that are put together wrong, at least the hoses come out the correct side as you can see the drain is now a rain catcher.

So this is the kind of damage that results from stupidity, I went ahead and welded an extra brace on the outside of this damaged area.

I also had to replace this pivot "pipe" on the coupler that was so frozen I could not get the pin to budge, a whole week of heat, soak, pushing it side to side against the 350C blade, the only result is shearing a bunch of grade 8 bolts that lock the pin, but it is all good now, I actually found the perfect piece in my junk pile.

 

[dnnhta]

I finally got it apart, is this the seal I need to change or is this chamber supposed to be wet and there is another seal in the lower housing???
View attachment 7488View attachment 7489 so does the motor push oil into the bottom housing? The one I have is leaking pretty consistent out around the shaft. Bobcat dealer is thinking maybe the motor is leaking also but have never worked on one so they can't be for sure

 

[dnnhta]

I finally got it apart, is this the seal I need to change or is this chamber supposed to be wet and there is another seal in the lower housing???
View attachment 7488

I have an auger that is leaking around the shaft as well. My local bobcat dealer thinks maybe the motor could be leaking. They have not ever worked on one so couldn't be sure. Does the bottom housing get fed oil from the motor as well for lubrication?

 

[mogman]

I have an auger that is leaking around the shaft as well. My local bobcat dealer thinks maybe the motor could be leaking. They have not ever worked on one so couldn't be sure. Does the bottom housing get fed oil from the motor as well for lubrication?

There is only one seal, that is in the lower housing on the output shaft, somehow the "body"of the motor is always vented to the low pressure (return) side of the hydraulic system no mater which direction the motor is turning.
There were three different lower housings and output shafts, the first series had an O ring, the second a Teflon seal like a hydraulic cylinder (gland) and the third went back to an O ring although not the same as the first series, Mine was a first series but the lower housing and output shaft had been changed to the second series sometime in its life.
You must remove the pivot pin in the mount (20), the cover (18) then the mount (22) then turn the ass with the output shaft up unbolt and remove the lower housing, you will need the housing to motor O ring (42) and what ever style seal you have, I would wait until confirming which style seal you have before ordering parts.

 

[dnnhta]

So it is very likely it's just the lower housing that's seals are bad and none need replacing in the motor? The motor just vents oil in and out of the lower housing?

 

[dsaw]

Correct, just the lower seal. While I'm sure it's possible, I haven't seen a post where someone had an issue with the motor. I did mine a few months back. I changed the lower bearing while I had it apart. Mine was a real pain to get apart, had to heat each bolt till glowing red to break the Locktite.

 

[mogman]

So it is very likely it's just the lower housing that's seals are bad and none need replacing in the motor? The motor just vents oil in and out of the lower housing?

Again the only seal is in the lower housing, the motor itself has no seal, the lower housing is full of oil

 

[ward]

Back in the day the 1990s and through early 2000s Bradco was the manufacturer of skid steer back hoes and augers, the planetary reduction drive auger as we see in the above picture I believe used gear oil in th the lower portion, I would think there would be a vent on the housing of the planetary, they also made a chain drive unit and it was just greased at the bearings.