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Re: [TowerTalk] Belt Slippage on LM-470 Towers

To: <paul@w8aef.com>, <k2xx@swva.net>
Subject: Re: [TowerTalk] Belt Slippage on LM-470 Towers
From: "k0dan" <k0dan@comcast.net>
Date: Thu, 24 Nov 2005 16:24:23 -0600
List-post: <mailto:towertalk@contesting.com>
I have several spare belts on hand here: 4L-420 (1/2"X 42"). Not sure if that's 
the size I'm using, or these are leftovers after having switched to a smaller 
belt. I do recall switching to a smaller circumference in the past...it made 
things operate much better.

They're readily available from auto parts supply houses, there is nothing 
proprietary about the Tri-Ex/Tash one. Also, once you find a supplier of 1/2" 
belts, you can readily find ones that are slightly larger or smaller. 

I have used the ones with and without the teeth, doesn't seem to make much 
difference, the key seems to be getting a good fit to match the pulley 
placement. The belts do stretch so annual replacement is another maintenance 
item. 

GL & 73

Dan
K0DAN

PS From the nomenclature you list, it appears those belts are 41"
  ----- Original Message ----- 
  From: paul@w8aef.com 
  To: k2xx@swva.net ; k0dan 
  Cc: Tower Talk ; k6ll@adelphia.net ; KJ6Y@aol.com ; K9RB@bellsouth.net ; 
wa3gin@erols.com 
  Sent: Thursday, November 24, 2005 1:50 PM
  Subject: Re: [TowerTalk] Belt Slippage on LM-470 Towers


  It could also be that the belt is too narrow and rides in the bottom of the 
pulleys.  The belt dressing is a good idea.  Even if it slips when first 
applied it will (should) reduce slippage in the future.

  There doesn't seem to be a brand name on my belt.  There are two sets of 
numbers on it: 321 E 12 and 43517.  I think the 43517 is the manufacturers part 
number.  This is a belt that I purchased to replace the worn belt that came 
with the tower.  Sorry, can't remember where I obtained it, maybe an auto parts 
store.  This belt also has 'teeth', for lack of a better word.  It does not 
have the same continuous cross-section, it has teeth.

  Also, the Tri-ex bill of materials calls for either a Dayco 4L410 or Gates 
2410 belt.

  de Paul, W8AEF
    ----- Original Message ----- 
    From: Joe Giacobello 
    To: k0dan 
    Cc: paul@w8aef.com ; Tower Talk ; k6ll@adelphia.net ; KJ6Y@aol.com ; 
K9RB@bellsouth.net ; wa3gin@erols.com 
    Sent: Thursday, November 24, 2005 7:27 PM
    Subject: Re: [TowerTalk] Belt Slippage on LM-470 Towers


    Thanks, Paul, Dan, Skip, both Daves and Roger.

    To answer several questions, I had recently changed to a new belt, applied 
grease to the drum via the fitting and changed the gearbox oil.  Frankly, I may 
have been a little lax about oiling the pulley bearings on one tower, but I 
know I had done it recently on the other tower.  I really don't think the issue 
is the pulleys or obstructions to the movement of sections.

    Usually, I can get things to work properly by simply retightening the belt. 
 In fact, I got it running yesterday and while it was going up sprayed Belt 
Dressing on the pulleys.  The slippage immediately began again.  I think that 
Belt Dressing is more of a lubricant and seems to make the problem worse.  The 
can says it is for the elimination of squeaks.

    The idea of reducing the belt size by a half inch makes a lot of sense.  In 
the past I had blindly replaced the belts with the identical size that came 
with the towers.  I bought a shorter belt yesterday and will try it out on 
Friday.

    Frankly, I had no idea that there was some kind of clutch mechanism 
associated with the large pulley.  I knew that the mounting hardware was 
unusual, but that information was a revelation.  I'll pay more attention to it 
in the future.

    I'll let you know how the shorter belt works tomorrow.

    73, Joe


 

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