[TowerTalk] Proper torque settings for G-2800 rotator mast clamp bolts?

[Jon Zaimes, AA1K]

A similar clamp can be homebrewed with a single saddle clamp placed above the Yaesu clamp and tied to its bolts with one or two pieces of angle stock or stiff flat metal. We do this on many installs and haven't seen any slipping (without having to pin mast). K4ZA described this in his NCJ column years ago.

73/MX/HH/HNYJon
Jon P. Zaimes, AA1KTower climber for hireFelton, Delawarehttp://www.aa1k.us/
 Reviews of AA1K tower work on eham website: http://www.eham.net/reviews/detail/12922 Hug your favorite tower every day, and always stay connected to it.

-----Original Message-----
From: Richard Thorne <rthorne at rthorne.net>
To: towertalk at contesting.com <towertalk at contesting.com>
Sent: Sun, Dec 25, 2022 10:35 am
Subject: Re: [TowerTalk] Proper torque settings for G-2800 rotator mast clamp bolts?

I purchased a Champion Radio clamp for this very reason.

It uses several U-Bolts.  I was able to slide it on the Orion 2800 
without having to remove the rotor or slide the mast up.

Unfortunately they are no longer for sale on the website and I'm not 
sure if Steve ( K7LXC ) made a model for the Yaesu rotor.

I have a K7NV clamp on my prop pitch.  That's easier to deal with as the 
rotor is at ground level for the rotating tower.

Rich - N5ZC



On 12/25/2022 9:12 AM, Jim McDonald wrote:
> Is anyone using the K7NV mast clamp with the Yaesu G2800?  Any issues?  Can it replace the Yaesu brackets without raising the mast to accommodate it?  (I understand I'd have to remove the rotor to slide the K7NV clamp up onto the mast.)
> 
> Thanks!
> 
> Jim N7US
> 
> 
> -----Original Message-----
> From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of Grant Saviers
> Sent: Saturday, December 24, 2022 18:34
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] Proper torque settings for G-2800 rotator mast clamp bolts?
> 
> I believe from using 3 Yaesu rotators, the 2800 bolt torque limit is more about the yield strength of the die cast clamps than the bolt strength.  A torque wrench will measure what "1/2 to 1 turn" really means.
> 
> The bolt heads will be marked so that will reveal the bolt strength and the permitted maximum torque can be looked up.  Since everything yields a bit, it is best to tighten in a pattern and repeat it 3 times.  After a day or two is even better but that is another tower climb.
> 
> Grant KZ1W
> 
> On 12/24/2022 11:50, Alan Higbie wrote:
>> As the result of an extremely high wind event, I will soon be going up the tower to loosen the G-2800 mast clamps, realign the mast and then re-tighten the M8 x 70 bolts.
>>
>> The Yaesu G-2800 manual says:
>>
>> “Caution: Do not over-tighten the nuts on the mast clamps.
>> They should be tightened until the spring washer becomes flat, then tightened further by 1/2 to one turn maximum.”
>>
>> I am still using the original hardware supplied with the G-2800.
>>
>> These spring washers have been in service for 5 years - so their springy-ness may not be the best indicator for torque.
>>
>> I believe that torque settings depend upon the grade of hardware being used: e.g. 8.8, 9.8, 10.9 or 12.9 - but I don’t know the grade of the stock hardware.
>>
>> What its the proper torque setting for these M8 x 70 bolts?
>>
>> 73,
>>
>> ~ Alan Higbie K0AV
>>
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