[TowerTalk] Hub City relube

Sat Jul 2 13:55:14 EDT 2016

I'm looking at changing out the type of oil in my
HDX-5106.  4 years ago, I hired KJ6Y to work on it
and what he did was to tape a makeshift "funnel"
under the bottom hole, then unscrew the bottom
screw first.  Since the top screw was still in
place, the oil pressure did not blow out the
screw and cause it to get lost.  Once he did that,
he then removed the top screw and oil gushed
out of the bottom hole.  On my tower, both holes
are easily assailable.  This was all done with
the tower vertical BTW.  I would think the
589 would be similar to mine, but you never
know.

Skip didn't scavenge any oil, since I believe
he was replacing with the same type.  He used
a gear oil pump to put the new oil in.  The
same type of pump might be superior to a turkey
baster for scavenging.

I'm getting ready to change my oil this summer.
We have perfect weather for it (triple digit
temperature, single digit humidity, welcome
to Sacramento county)

Rick N6RK

On 7/2/2016 10:36 AM, Les Kalmus wrote:
> Bob,
>
> Both of mine have a chain from the reducer to the cable reel and there
> is a plug in about the same position. These plugs are in line with the
> center line of the two shafts. In whichever position the unit is
> mounted, the upper plug is used to determine the oil level but I guess
> it can be used as an oil input too.
>
> I'll wind up using that same lower one to empty the case but I'll use
> the upper one to fill it instead of fooling with the vent in the motor
> mount.
>
> I have some very different V belt sizings now. I'll remove the V belt
> and work that step once I get started on this.
>
> Les W2LK
>
>
> On 7/2/2016 12:41 PM, Bob K6UJ wrote:
>> Les,
>>
>> The  worm drive reducer on my HDX-589 has a chain drive from the motor.
>> Sounds like mine is mounted differently than yours, looking front side
>> at the pulleys, there is one
>> access plug on the left side about 2/3 the way up for filling and
>> there is another plug on the back side
>> about 3" from the bottom of the case I used for draining.
>> There isn't much lube volume from the back access plug to the bottom
>> because the worm gear displaces
>> a lot of the lube.  The turkey baster works fine, takes a few tries to
>> get it all.  That's how I did mine.
>> Get your wife a new baster when done.
>>
>> Bob
>> K6UJ
>>
>>
>>
>>
>> On 7/2/16 8:52 AM, Mike Fahmie via TowerTalk wrote:
>>> The V-belt on my HDX-572MDPL (circa 2003) is 4L-370.
>>> -Mike-
>>>
>>>          From: Les Kalmus <w2lk at bk-lk.com>
>>>   To: TowerTalk at contesting.com
>>>   Sent: Saturday, July 2, 2016 7:13 AM
>>>   Subject: [TowerTalk] Hub City relube
>>>     I have an older UST HDX-589MDPL and a less old HDX-572MDPL. There
>>> was a
>>> discussion early this year about the type of lubrication to use in a Hub
>>> City reducer which was a great help in getting ready to relube both of
>>> my units.
>>> The older 589 Hub City reducer was manufactured in Sep 1992 and the the
>>> newer in Jan 2005. Both are model 321. The older is style A and the
>>> newer style C.
>>>
>>> I found Mobil SHC634 at McMaster for a good price and they also carry
>>> unbranded with the same specs for even less. Both reducers are mounted
>>> upside down with a vent or access plug on the top face. This plug is
>>> accessed through a hole in the motor mount plate. There are no drain
>>> plugs that I can find anywhere near the bottom face of the cases. There
>>> are several plugs in the sides of the cases which are aligned with the
>>> various shafts. Hub City told me these are mainly for checking the oil
>>> level depending on how the unit is mounted. Except for the vent on the
>>> top face there are no oil drainage access points on either case as shown
>>> in the Hub City documentation which is available on their website.
>>>
>>> My questions for anyone who has done this are:
>>>
>>> Did you have to remove the motor to access the upper plug?
>>>
>>> Did you have a problem draining the oil using one of the lower level
>>> checking plugs?
>>> I know someone mentioned using a turkey baster to suck out the remaining
>>> oil but he said there was about 1/2" of oil left after draining. In both
>>> of my cases it looks like there will be more like 3" of oil left to suck
>>> out. Is there a better idea than the turkey baster?
>>>
>>> Does anyone know the size and letter of the V-belt from the motor to
>>> large pulley for either model?
>>>
>>> Any suggestions would be greatly appreciated.
>>>
>>> Les W2LK
>>> _______________________________________________
>>>
>>>
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