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Re: [TowerTalk] HAM IV Service Manual

To: "Jim Rhodes" <>, <>
Subject: Re: [TowerTalk] HAM IV Service Manual
From: "Adrian Rees" <>
Date: Mon, 22 Jan 2007 13:19:32 -0000
List-post: <>
Jim's idea of replacing the bolts with studs, is an excellent one. I'll 
certainly be doing this to my HAM IV's that I am overhauling at the moment.
I had a similar problem, and successfully extracted the sheared bolts with a 
Stud Extractor.If you havn't used one before they are easy to use, and most of 
the time, they will cure the problem. I soak the area in thin machine oil or 
penetrating oil, for a day or so. Then drill the required hole in the remainder 
of the bolt, screw in the extractor and start turning.I use a long socket 
handle to get lots of torque on the extractor.Generally it takes two or three 
short sharp pulls on the handle and the stud will start to turn. Once started 
it usually comes out fine.
I've never had to get something re-tapped. Including the engines I've extracted 
studs from. 
Hope this helps.


From: on behalf of Jim Rhodes
Sent: Mon 22/01/2007 12:54
Subject: Re: [TowerTalk] HAM IV Service Manual

On my rotors I have replaced the bolts with studs, locktited and a
jam nut to keep them in place. Then when on the tower I just set it
on the plate & put flat, lock & nut on from the bottom. Before I
leave the ground I put some anti-seize on the threads of the nuts (&
the spares). One of them has been drilled out to 5/16" holes (bought
used that way) the other has stock 1/4". Makes rotor swap a breeze.

At 01:27 PM 1/21/2007, Mike Holley wrote:
>My Name is Mike Holley VE7AVM and have two HAM IV Rotators in service  but
>on removing one  which had become defective  for bench overhaul  three out
>of the four mounting bolts  snapped off in the  attempt to unscrew from the
>tower mounting plate , every effort has been made to remove the bolts from
>the casting but with out success  . My next step would be to replace the
>casting  but  as I do not have the service manual  I have no idea of the
>current part number  ,I have written to "Hy Gain "   to try to purchase a
>Service Manual but to this date no response  . Can any one help please .
>The data stamped on the bottom of the casting is H4 S1  JUL 81
>    Mike Holley VE7AVM
>TowerTalk mailing list

Jim Rhodes K0XU

Experience is the thing you have left when everything else is gone.

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