[Hammarlund] SP-600JX14 problem - main tuning capacitor sync

[Richard Knoppow]

    I interpreted your problem as saying the capacitor did not fully 
mesh. The dial position is adjustable as stated but that won't change 
the stop points for the cap. It should fully mesh regardless of the dial 
alignment. Its been too long since I was in the tuning drive and I don't 
remember how the stops are arranged but, if the former owner worked on 
the gearbox he might have gotten the gears misaligned.
    The cap is driven by a crank with a spring coupling. The spring is 
to take up any overtravel. Make sure the drive crank is fastened to the 
lever on the capacitor correctly. If you have to get into it be very 
careful the spring doesn't go flying off to be lost.
     If you get it running right I an give you some detail on getting 
the dial and moving pointer aligned mechanically.

On 11/16/2024 9:34 AM, Bill Cotter wrote:
> Thanks, Al. I will remove the front panel and check the relationship 
> between the dials, stop pin and three-screw slots.
> 
> 73 Bill N4LG
> 
> 
> At 10:34 AM 11/16/2024, AW wrote:
>> Hi Bill,
>>         It sounds like the previous owner didn't get the new paper 
>> dials on properly, or didn't move the dial to correct the error.  The 
>> dial has 3 slotted holes at it's center, and is held on place by 3 
>> screws thru a disc.  They can't be accessed unless the panel is off, 
>> or at least possibly loosened and moved back.  (I hope that makes 
>> sense.) There might be enough adjustment available to get it right.
>>         At the lower end of the band, the dial should indicate zero on 
>> the logging scale, with the freq. dial right on the left end of it's 
>> scale. And the stop pin on the stop.
>>         Shouldn't have to (don't) mess with any gearing.
>>         Take a look at Andy Moorer's instructions.  As he says, re: 
>> the manual, "The instructions are often more confusing than helpful.
>>   <https://www.hammarlund.info/GearTrainAlignment.html>
>> 73,
>> Al, W8UT
>>
>>
>>
>> On 11/16/2024 9:59 AM, Bill Cotter wrote:
>>> Hello everyone,
>>> I have a nice SP600JX14 I am restoring to work with my globe King 
>>> 500A transmitter. I have the RF deck and side porch recapped with 
>>> 0.01 600VDC disc ceramics and all out of tolerance resistors 
>>> replaced. After reassembling the RF deck on the chassis, I noticed 
>>> something strange.
>>> When the main tuning dial is set to the bottom of the band and the 
>>> logging scale is set to zero, the main tuning variable capacitor is 
>>> not fully meshed. It is all but about 10-15 degrees meshed. The stop 
>>> pin is resting against its stop, as expected. When I rotate the main 
>>> tuning to the highest frequency, the dials do not reach the expected 
>>> end point and the stop pin does not reach its stop. I assume the main 
>>> tuning variable capacitor has reached its end point.
>>> It appears that the main tuning variable capacitor is out of sync 
>>> with the dial indicators. The previous owner refinished the front 
>>> panel and applied new dial scales to the dial plates, but he never 
>>> disturbed the gearing behind the dials.
>>> Any thoughts on how to correct the not-fully-meshed main tuning 
>>> capacitor problem? I have all the digital copies of manuals with gear 
>>> set exploding diagrams and tear down/reassembly directions, but I 
>>> haven't come across the synchronization procedure.
>>> Thanks in advance.
>>> 73 Bill N4LG
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-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998