[TowerTalk] Procedure to lower a mast

[Rick Scott]

In this case would renting a bucket truck be a better value ????

Scotty N7HJ


On 7/8/05, Dino Darling <k6rix at earthlink.net> wrote:
> Do you have the ability to bolt on a winch at the top of the flat-top?  If
> so...
> 
> =======================================
> Set the antennas to NORTH (or south or east or west) and MARK IT!
> 
> Use a shaft clamp (or muffler clamps) to hold the mast from falling down
> through the tower.
> (McMaster Carr
> <http://www.mcmaster.com/itm/find.ASP?tab=find&context=psrchDtlLink&fasttrack=False&searchstring=6436K27>6436K27
> or equivalent)
> 
> Connect/secure the winch cable to the bottom of the mast, just above the rotor.
> (assuming you have a rotor and not a rotatable tower)
> 
> Depending on what type of thrust bearing you have, you will need to loosen
> them enough to allow the mast to slip through.  They will also help support
> the mast as it goes down.
> 
> Bring the mast up with the winch, just enough to remove the rotor.  You can
> tie the rotor out of the way or lower it down for inspection since it is out.
> 
> Get back up to the flat-top, loosen the shaft clamp and lower the mast with
> the winch.  The winch does all the work!
> 
> MARK THE BEAM LOCATION ON THE MAST!
> 
> Loosen the TH7 and continue to lower the mast.  The mast should slip
> through the boom-to-mast clamp.
> 
> When you get the mast down far enough to reach your antenna, re-install the
> shaft clamp and go to work!
> 
> ======================================
> 
> I do not have the advantage of seeing your set up.  Every tower is
> different and therefore have different ways of attack.  Use what I've given
> above at your own risk and modify as necessary.  When in doubt, hire a
> professional!  Be safe!!!
> 
> 
> At 12:20 PM 07/08/2005 -0400, you wrote:
> >I have a 24ft chrome moly mast on my 100ft Rohn 45 tower.  10ft of the mast
> >are in the tower and held by two thrust bearings.  14ft are above the flat
> >top
> >section with a Hygain TH7 mounted about a foot above the top section and a
> >Cushcraft 402CD mounted about 12ft above the top section.
> >
> >I need to get to the 402CD and therefore will need to lower the mast.  Since
> >this mast is quite heavy, I'd like to know a safe procedure to do so.
> >
> >73, Greg  AG5W
> >_______________________________________________
> >
> >See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
> >Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with
> >any questions and ask for Sherman, W2FLA.
> >
> >_______________________________________________
> >TowerTalk mailing list
> >TowerTalk at contesting.com
> >http://lists.contesting.com/mailman/listinfo/towertalk
> 
> Dino...k6rix at earthlink.net
> _______________________________________________
> 
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
> 
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>