I helped a friend do this once. We tilted the LM-470 over,
disassembling the booms of several antennas to let the tower
get horizontal. Then we slid the mast out almost all the
way, and pulled the rotator out of the space near the top.
We had a strong person on a stepladder supporting the mast,
and keeping it from rotating, but it was a hairy and
dangerous operation. The mast really wanted to rotate, since
the antennas were so unbalanced. Next time I would make a
special mast support fixture out of long 2x4's with one bolt
connecting them to make an X. Some sort of muffler clamp /
angle iron fixture to keep the mast from rotating is also
required. A stout person on a stepladder will probably still
be required, but the fixtures should take most of the heavy
effort.
Dave Hachadorian, K6LL
Yuma, AZ
----- Original Message -----
From: "Bill Gaines AD8P" <ad8p@wcoil.com>
To: <towertalk@contesting.com>
Sent: Sunday, May 31, 2009 12:29 PM
Subject: [TowerTalk] Changing Rotors in LM-470
>I have an LM470 motorized crank up with the tip over option
>with it. On a 15' mast I have a 3L Steppir 11 el 2 meter
>beam and a 2 el 40. I need to replace the rotor. How have
>others done it? When I first installed the rotor there was
>nothing in the way. No mast or antennas and it went well.
>Now with the mast and antennas in the way do I need to
>remove them all and start from the beginning? Once the
>tower is almost horizontal can I crank it out far enough to
>remove the rotor then bring it back before raising it again
>or will this cause too much strain on the cable and winch
>system? My first inclination is to try to slide the mast
>and antennas out a couple feet to make room for the old
>rotor to come out and a new one to slide in. However if
>this is more work than detaching all antennas and working
>with the bare mast then so be it.
>
> What have others done before me?
>
> Thanks Bill AD8P
>
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