Date: Thu, 4 Jul 2019 16:08:18 -0500
From: Phil Snyder <n9lah@comcast.net>
To: towertalk@contesting.com
Subject: [TowerTalk] HDX 555 Motor Drive BEaring
<Hi All
<Went out this morning to crank up the tower to see if I could hear any
<of the EU on 6 meters. as soon as it started up I heard a couple
<cracking noises. I stopped and tweaked it up and down a little and
<discovered that the flange bearing on the back side of the multi wrap
<sheave failed.
<Anyone with experience replacing this? I was able to retract the tower
<to a point that I can block both sections to the base. My thoughts are
<to release the tension from the positive pull down end of the cable,
<loosen and support the drive assembly so I can swing it out of the way
<to get the bearing out. I am assuming I will need to take it to one of
<the local bearing shops, unless some one knows what bearing to replace
<it with. I know lots of stuff changed over the years at UST and I
<purchased this used so don't know the age.
<N9LAH
## are u talking abt the flange bearing on each end of the drum ?
The shaft on my drum is 2 inch solid steel.... and UST used a 2 hole
flange type bearing. These are the type that allow for some shaft
misalignment.
I call em...floating type bearings. One of the mounting hole flanges had
cracked
right through. UST shoulda used a 3 or 4 hole mounting bearing. This
was the bearing
where the 6 inch chain sprocket is. I had a helluva time getting the
sprocket off. The
key was jammed in tight. Bearing itself was stuck on good. Used a
torch plus gear puller
to get the sprocket off. Got the bearing half off. Ended up cutting
the bearing apart with
a zip wheel.
## New key is longer...so I can get at it to pull out. New double wide
sprocket is better designed.
Never seize on everything. Right angle and also 65 deg angle zerk
fittings installed everywhere.
Major pita...... poor design. This is on an old style HDX- 689.
Jim VE7RF
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