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20th Jan 2019, 09:19 AM #1
Unusual Seal on Trailer Drum Brakes
Can anyone shed some light on what is going on here.
I would normally expect to see a seal similar to this standard setup in the first pic.
However when I pulled off the drum it looks like the seal is in two parts (or maybe broken, however both drums are the same). These are ALKO brakes, on a horse float.
So:
1. Is this normal?
2. Can I replace with a normal seal?Cheers.
Vernon.
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Bite off more than you can chew and then chew like crazy.
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20th Jan 2019, 10:30 AM #2Most Valued Member
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That's a marine type seal and they were typically fitted to axles on boat trailers. You can replace them with a standard seal, but I wouldn't as they are a better seal and easily available. More often than not they have been supplied in hub kits that I've bought in recent times.
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21st Jan 2019, 01:34 PM #3
Thank you for that Karl. Much appreciated.
Cheers.
Vernon.
__________________________________________________
Bite off more than you can chew and then chew like crazy.
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23rd Jan 2019, 05:40 PM #4
As Karl said, they're a Marine seal. The retaining ring is Stainless, and the rubber seal is a tight fit on the stub axle. The outer flange of the rubber seal spins against the outer face of the stainless ring and is supposed to keep water out. They're not really designed to be used with drum brakes as it's difficult to get the seal to seat in the stainless ring because you can't access behind the drum as you can with a disc rotor to make sure it's seated. Some manufacturers also machine a step in the seal journal specifically for boat trailer axles to keep the rubber seal in the correct spot when assembling.
My concern with yours is that it's only looks to be a Holden outer bearing (LM11949), which will rate the axle to 1000Kg, which in conjunction with non-load sharing suspension will give you a Float capacity of 1666.66Kg.Too many projects, so little time, even less money!Are you a registered member? Why not? click here to register. It's free and only takes 37 seconds! Doing work around the home? Wander over to our sister site, Renovate Forum, for all your renovation queries.
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24th Jan 2019, 01:02 PM #5Diamond Member
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24th Jan 2019, 10:59 PM #6Most Valued Member
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Found this article, the quote below was from page 4 of 5
http://easytow.com.au/wp-content/upl...edTrailers.pdf
"All axles in a group must be interconnected by a load sharing suspension except in a close-coupled axle
group (where the two axles in a group have their centres not more than one metre apart, three axles not
more than 2 metres apart or four or more axles not more than 3.2 metres apart) provided that the load
carrying capacity of each axle in the group and the wheels and tyres fitted to it is:
at least 120% of the load on that axle with the trailer at its ATM; and
at least equal to the load on that axle with the trailer at its ATM and any retractable axle retracted."
So it seems that "small trailers" can have non load sharing suspension, provided that axle centres not exceed 1 metre, for a tandem and triaxle not more than 2 metres apart.
KrynTo grow old is mandatory, growing up is optional.
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25th Jan 2019, 12:34 PM #7
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25th Jan 2019, 02:26 PM #8
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26th Jan 2019, 11:15 PM #9
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27th Jan 2019, 12:27 AM #10Most Valued Member
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From memory, I think they tried to bring in that multi axle combinations had to be load sharing here (South Australia). But I still see trailers getting around with non load sharng suspensions. Mainly on jacked up 4WD's with the braked axle off the ground!!!!!!
KrynTo grow old is mandatory, growing up is optional.
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27th Jan 2019, 12:34 AM #11
Being a National standard for building small trailers, it’s be hard for individual States to try and make a change like that go through without a fair uproar from manufacturers.
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