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Old 05 July 2013, 09:51   #1
AJ.
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Too much grease

On the way back from Poole last Sunday I had the unpleasant experience of not having any brakes on the trailer.

Not having time to check them out myself I run the trailer into Banbury Trailers who showed me that I had been pumping too much grease into the bearing savers and it had gone all over the drums and impregnated the shoes so much that they needed replacing.

So having had the problem last year of my local car mechanic only applying a sparing amount of grease on the bearings and they lasted 9 months. To this year packing the bearings and then using the grease gun to pump in until the grease comes out of the bearing saver output hole. I thought this was the correct way to tell when you had filled the bearing cup and saver?

How do the rest of you know when you have the right amount of grease in there?
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Old 05 July 2013, 10:02   #2
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There's no such thing as too much Grease....

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Old 05 July 2013, 10:08   #3
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You nobbur!

Shouldn't you be sorting out your new action man boat for Sunday
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Old 05 July 2013, 11:05   #4
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On the way back from Poole last Sunday I had the unpleasant experience of not having any brakes on the trailer.

Not having time to check them out myself I run the trailer into Banbury Trailers who showed me that I had been pumping too much grease into the bearing savers and it had gone all over the drums and impregnated the shoes so much that they needed replacing.

So having had the problem last year of my local car mechanic only applying a sparing amount of grease on the bearings and they lasted 9 months. To this year packing the bearings and then using the grease gun to pump in until the grease comes out of the bearing saver output hole. I thought this was the correct way to tell when you had filled the bearing cup and saver?

How do the rest of you know when you have the right amount of grease in there?
it is.

How much came out of the hole? you only need to 'pop the top' on the anodised ones that my Rapide has.
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Old 05 July 2013, 11:17   #5
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Hey Nos,

Using the grease gun I pump it until I can see a small amount of grease coming out of the other hole in the bearing saver then stop.

I would have thought that the moment the grease "pops" out of the hole the pressure wouldn't be so much as to push the plastic bearing cap at the back of the hub and force it way into the brake area
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Old 05 July 2013, 11:44   #6
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The rear seals give way at far lower less pressure than what the bearing saver spring tends to push in at. When cold and not moving, you'll get a pool of grease under the bearing savers. Once you get going and the hub warms up, the bearing saver spring tends to push that pool of warm grease through the outer and inner bearings and then out through the rear seal. It only stops leaking out back there when the saver spring is no longer under pressure. If you then re-pump up the hubs so the bearing saver is under pressure again, the whole process repeats with new grease displacing the old which oozes out the rear seal...
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Old 05 July 2013, 11:50   #7
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The rear seals give way at far lower less pressure than what the bearing saver spring tends to push in at. When cold and not moving, you'll get a pool of grease under the bearing savers. Once you get going and the hub warms up, the bearing saver spring tends to push that pool of warm grease through the outer and inner bearings and then out through the rear seal. It only stops leaking out back there when the saver spring is no longer under pressure. If you then re-pump up the hubs so the bearing saver is under pressure again, the whole process repeats with new grease displacing the old which oozes out the rear seal...

These are a bit different to the sort you're thinking of-they're essentially a grease reservoir and rely on trapped air pressure inside.There's not a lot of pressure there, just enough to stop water getting to the bearing. There's a 'blow off valve' on them which releases pressure by dumping grease out of the outer face.

Essentially, you just need to pump them up slowly so you don't overpressure them. If you see the blow off valve top move, you've got enough in there.
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Old 05 July 2013, 11:51   #8
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Hey Nos,

Using the grease gun I pump it until I can see a small amount of grease coming out of the other hole in the bearing saver then stop.

I would have thought that the moment the grease "pops" out of the hole the pressure wouldn't be so much as to push the plastic bearing cap at the back of the hub and force it way into the brake area
Shouldn't be-maybe your rear seal is shot.
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Old 05 July 2013, 11:55   #9
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These are a bit different to the sort you're thinking of-they're essentially a grease reservoir and rely on trapped air pressure inside.There's not a lot of pressure there, just enough to stop water getting to the bearing. There's a 'blow off valve' on them which releases pressure by dumping grease out of the outer face.

Essentially, you just need to pump them up slowly so you don't overpressure them. If you see the blow off valve top move, you've got enough in there.
Got any pictures? I don't think we have such things over here. We basically have the conventional seals with bearing savers (where the bearing saver spring is almost always far straonger than the seals can tolerate). And oil filled hubs which have a clear cap and are 1/2 full of oil continually bathing the bearings. These are rather rare around my area.
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Old 05 July 2013, 12:05   #10
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Ya not greasing ya nipples correctly nobbur!!
Just a little tweakin every so often and then a damn good pumping!! Would you like me to show you how!??
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