From: Bruce C. Beattie (bruce@EECS.Berkeley.EDU)
Date: Mon Aug 22 2005 - 19:15:26 PDT
Hi Sonny,
Yes, the flanges are tied together with just a bolt and a locknut.
No washer.
The spider or "U-Joint" as it is sometimes called, is attached to the
flange plate
by a bolt and a lock plate. The lock plate looks like a very thick
inside star washer
whose teeth point in the same direction so that one side of the lock
plate is flat
and the other side is barbed. The barbed side is supposed to interface
with the inside
surface of the bolt head and the smooth side is supposed to interface
with the bottom of
the recessed hole in the flange.
The failure that occured was because the lock plate was put in upside
down so that the
teeth dug into the softer metal of the flange, and in doing so allowed
the joint to loosen up.
if they had been put in correctly, the teeth would never have dug into
the grade 8 bolt head
and the flat surface would never have dug into the bottom of the
recessed hole in the flange.
I am not too good at writting technical manuals, so I hope I was able to
get this accross
clearly.
Bruce MVPA 23824
Sonny Heath wrote:
> I believe that if that jackshaft had washers on it it was wrong in the
> first place. I believe that they were assembled with a bolt and
> locknut only. They need to be checked ocasionally as they will work
> loose just like lugnuts. I had one to come through the floorboard in
> VietNam once.
>
> Sonny
>
>
> ----- Original Message ----- From: "Bruce C. Beattie"
> <bruce@EECS.Berkeley.EDU>
> To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
> Sent: Monday, August 22, 2005 8:25 PM
> Subject: Re: [MV] Flange bolts for propeller shafts
>
>
>> Hi Ryan,
>> Well, yes and no....
>> Probably the most important factor here is the length of the shank.
>> It is
>> important that there be no possibility of play in the joint other
>> than the hole to
>> bolt shank clearance. Once the threads get into that area and
>> something loosens up,
>> it can reduce the diameter of the bolt, introduceing play in the system.
>> In some systems it probably isn't that big a deal, but since this
>> is for the Transmission
>> to Transfer case propeller shaft of a 5 Ton, I really don't want to
>> throw dice.
>> Maybe I'm being paranoid, but then I didn't think this part would
>> fail the way it did,
>> just because someone put some lock plates in backwards.
>> ie Better safe than sorry.
>>
>> Thankyou very much for the advice though!
>> Bruce
>>
>>
>>
>>
>> Ryan Gill wrote:
>>
>>> At 3:14 PM -0700 8/22/05, Bruce C. Beattie wrote:
>>>
>>>> Hi All,
>>>> Anyone have some leads on which surplus venders sell flange bolts
>>>> for the
>>>> propeller shafts? Here is the NSN and the critical properties:
>>>>
>>>
>>> I'd think that the only special thing about them is the phsphate
>>> coating. Otherwise isn't it just a given size Grade 8 Bold and nut?
>>>
>>>
>>
>>
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