Rear axle nut question
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Road Master
Joined: Jan 2012
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From: North Carolina
Rear axle nut question
I noticed on my 1988 FLHTC that the rear axle nut is not castelated. It is just a big lock nut and I don't see that the axle was ever drilled for a castle nut. Is this the way these models were? I sure would feel better with a castle nut and a cotter key.
Seasoned HDF Member
Joined: May 2008
Posts: 21,132
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From: South Carolina
According to my parts manual, the `88 models used:
Axle 41110-79A (this axle is drilled for a cotter pin)
Hex nut P/N 7986
Washer P/N 6655
Lock washer P/N 7022
They changed the axle nut setup for `89:
Axle 41110-79A
Castle nut P/N 7987
Spacer 5756
Get the axle (same for many years), nut and spacer for `89 and you will be good to go.
Axle 41110-79A (this axle is drilled for a cotter pin)
Hex nut P/N 7986
Washer P/N 6655
Lock washer P/N 7022
They changed the axle nut setup for `89:
Axle 41110-79A
Castle nut P/N 7987
Spacer 5756
Get the axle (same for many years), nut and spacer for `89 and you will be good to go.
Last edited by Dan89FLSTC; Feb 10, 2014 at 05:29 PM.
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
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From: la la land jerzey
your bike uses a nut, lock washer than a flat washer, and it does not come loose if you torque it in place -- i have installed a NY lock in place of the nut and lock washer, and if you use a new one each time the ( ny lock ) it will never fall off or come loose -- johnjzjz
Banned
Joined: Jul 2010
Posts: 853
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From: Melbourne
Mine is the same...just a flat washer, lock washer and normal nut.
At 60lbs of clamping pressure it has not come loose in 25 years. I will swap to a castellated nut one day as its a requirement for racing, but thats the only reason I'll be doing it.
At 60lbs of clamping pressure it has not come loose in 25 years. I will swap to a castellated nut one day as its a requirement for racing, but thats the only reason I'll be doing it.
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Road Master
Joined: Jan 2012
Posts: 856
Likes: 9
From: North Carolina
I thought about drilling the axle and getting a castle nut. I usually add a drop (or two) of blue Locktite to the threads when I reinstall the nut. It's not come lose since I've had it but, it doesn't seem like the best design I've ever seen.
Last edited by falconbrother; Feb 10, 2014 at 07:46 PM.
Tourer
Joined: Jun 2013
Posts: 272
Likes: 5
From: pomgolia
castelated nut is an engineering overkill and its not necessary
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