Author Topic: Rohloff Hub Oil  (Read 949 times)

zomarzi

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Rohloff Hub Oil
« on: June 12, 2017, 08:50:39 AM »
Opinions on hub oil.
« Last Edit: June 12, 2017, 06:55:16 PM by zomarzi »

geocycle

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Re: Rohloff Hub Oil
« Reply #1 on: June 12, 2017, 12:18:02 PM »
??
 

energyman

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Re: Rohloff Hub Oil
« Reply #2 on: June 12, 2017, 12:22:15 PM »
Thanks for reminding me, my RST needs an oil change this month.

Matt2matt2002

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Re: Rohloff Hub Oil
« Reply #3 on: June 12, 2017, 01:37:01 PM »
Does everyone stick to the recommended milage/ time or do a few of us sneak over and grab a few freebies?
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mickeg

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Re: Rohloff Hub Oil
« Reply #4 on: June 12, 2017, 02:40:36 PM »
Slightly off topic - last summer several people thought that something was wrong with my Rohloff losing oil.  I changed the oil shortly before I left for Iceland (15 ml), and from the photo you can see that a lot of oil came out of the hub.  Although I had been riding that Rohloff for a bit over three years at that time, I still considered myself pretty new to understanding Rohloffs, so I assumed everything was normal.  When the photo was taken I probalby had about 700 miles (~1000 km) of distance on the hub after the oil change.  After those comments, I removed a few of the parts off of the left side to see if I was missing a gasket or anything like that, everything appeared to be in order.

I am pleased to report that this spring I changed the oil again and this time I am not seeing any evidence of excessive oil loss.

I have concluded that the problem was changing oil shortly before getting onto two airplanes (one trip, but a connecting flight makes for a second plane flight).  The air pressure changes is what I suspect may be the culprit.  Perhaps on one or both flights, the left side of the hub was face down and the oil came out of the hub under air pressure changes and resided in the gear change mechanism before slowly leaking out later?  I have no evidence that the flights were responsible, but I can't think of anything else.

Since everything now seems to be just fine, the hub works great, only minimal oil is seeping out, I am not going to concern myself with the past.


pavel

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Re: Rohloff Hub Oil
« Reply #5 on: June 12, 2017, 05:39:11 PM »
Silly question, but could you have possibly not syphoned out the old oil first? That seems a lot of oil, and I thought that plane cargo hulls were pressurized nowadays?

mickeg

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Re: Rohloff Hub Oil
« Reply #6 on: June 12, 2017, 05:54:47 PM »
Since I only do an oil change once a year, I watch the video first to remember what I am supposed to do.  No, I did not forget to drain out the cleaning oil.

I think the cargo hold pressure is the same as the inside of plane pressure, which I believe is equivalent to about 8000 feet of elevation.  So, there definitely is some air pressure changes in flight.  That is why you should avoid flying if you are ill and have stuffed up sinuses.


Andre Jute

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Re: Rohloff Hub Oil
« Reply #7 on: June 12, 2017, 08:01:02 PM »
Every year at the beginning of the spring and the winter there's a puddle of oil under my Rohloff. Since I do the oil change in the first week of January, and put in only 15ml of all-seasons oil as advised by Rohloff, after thoroughly draining out the cleaning oil, there is no question of an overfilled gearbox. In fact, after I instituted the 15ml routine, my gearbox has been pretty clean, whereas before it always had a trace, or sometimes a smear, of oil on it. The leakage has to do with the change of heating (the temperature in the space where the bike stands is controlled by the dial for the house temp) about that time, and possibly with the natural air pressure change also noticeable where I live at the change of seasons. Leakage is the wrong word though, as it is more of a misting of oil out of the breather vent in the axle. So I'm not surprised at all by George's tale of airplane journeys causing oil to mist out to the extent of a small puddle. You wouldn't even need the airplane journey, a truck hauling a bike to a different elevation would probably have the same effect.

These "misting" events I've observed don't last long, a couple of days or so, then the gearbox settles down as the internal pressure adjusts to the external pressure. It is not necessary to top up the gearbox even if appreciable amounts of oil have spilled out: enough clings to the gears to see you through to the bike's next oil change.

Note that some of the so-called "seals" on the Rohloff box are paper. A little oil mist on them probably aids sealing.
« Last Edit: June 13, 2017, 10:22:37 PM by Andre Jute »

mickeg

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Re: Rohloff Hub Oil
« Reply #8 on: June 12, 2017, 09:39:43 PM »
I just copied and pasted this from Rohloff:

  • Transportation of the Rohloff SPEEDHUB 500/14

    If transporting a bike fitted with a Rohloff SPEEDHUB 500/14, care should be taken that the rear wheel is transported in an upright position. In a car or an aeroplane, there could be great changes in the air temperature/pressure.

    When the wheel lies on its side, oil could seep out of the seals because the oil is sitting directly over these seals on either the left or the right side. Transportation in the upright position will prevent the air temperature/pressure in having an effect over the Rohloff SPEEDHUB 500/14.

    If it is not possible to transport the wheel in the upright position due to according packaging requirements, don't worry. The leakage of oil will not cause any damage.

Above pasted from this link:
https://www.rohloff.de/en/service/faqs/index.html#c9548

I think I recall hearing at one time that the vent is in the skewer hole in the axle.  And I usually see an oil coating on the skewer when I remove it.

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geocycle

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Re: Rohloff Hub Oil
« Reply #9 on: June 13, 2017, 09:02:28 PM »
Does everyone stick to the recommended milage/ time or do a few of us sneak over and grab a few freebies?

Every September since 2006 I have religiously changed the oil. The first couple of times I thought I could hear a difference but now it just keeps things ticking over.
 

Matt2matt2002

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Re: Rohloff Hub Oil
« Reply #10 on: June 13, 2017, 11:19:27 PM »
That's interesting.
I always think I can hear a change from within, after an oil change.
I'm pretty good at regularly changing the oil. But even so, I think things run smoother and faster. Very strange. Or not.
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Danneaux

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Re: Rohloff Hub Oil
« Reply #11 on: June 14, 2017, 01:02:41 AM »
I change my Nomad's oil religiously. Also did on AndyBG's kindly loaned RavenTour midway on my European double-crossing. Couldn't get the oil separately, so I paid a German bike shop familiar with Rohloffs to do it. Came out just fine and no leaks; oil and labor for less than I pay for oil alone here in the US (about USD$22.50 including shipping on eBay).

Best,

Dan.

pavel

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Re: Rohloff Hub Oil
« Reply #12 on: June 14, 2017, 09:47:24 PM »
Every September since 2006 I have religiously changed the oil. The first couple of times I thought I could hear a difference but now it just keeps things ticking over.

My hubs been with no leaks what so ever thus far - but it's best to stack every bit in ones favor - so then what sort of special ceremony or chants are there to changing the oil "religiously"? Does one need candles? 

geocycle

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Re: Rohloff Hub Oil
« Reply #13 on: June 14, 2017, 10:08:51 PM »
Indeed there is a solemn ceremony Pavel. The crucial element is the choice of tea. We have had several threads about it. If you wonder what I'm on about I refer you to Thorns oil change video.
 

mickeg

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Re: Rohloff Hub Oil
« Reply #14 on: June 15, 2017, 12:44:41 AM »
...
My hubs been with no leaks what so ever thus far - but it's best to stack every bit in ones favor - so then what sort of special ceremony or chants are there to changing the oil "religiously"? Does one need candles?

Indeed there is a solemn ceremony Pavel. The crucial element is the choice of tea. We have had several threads about it. If you wonder what I'm on about I refer you to Thorns oil change video.

I skip the tea, substitute a nice red, perhaps a Merlot or a Cabernet Sauvignon. 

And since I always re-use the drain screw, I ceremoniously put another layer of blue loctite on the screw while draining the cleaning oil.