[AJD] Another trivia question - Pre-Screeners??

Sun Nov 27 22:26:21 PST 2005

Dean,
You're welcome.  I think the non-round-hole material is just expanded 
metal - pretty common stuff.  Go to www.mcmaster-carr.com and type in 
expanded metal in the search box, then go to wire mesh and you'll see lots 
of pix and hole sizes.  So, I would think that would be more common than 
metal with round holes punched in it - that would have to be made for the 
purpose.  So, I would agree the (design engineered) round holes would come 
first, then some supplier gave a cheaper price with expanded metal and won 
the bid.
The parts catalog pix may be correct.  How long did they retain the 
prescreen?  Is it still available - maybe with expanded metal.
Regards,
Duane

----- Original Message ----- 
From: "Dean VP" <deanvp at att.net>
To: "'Antique John Deere mailing list'" 
<antique-johndeere at lists.antique-tractor.com>
Sent: Monday, November 28, 2005 12:00 AM
Subject: RE: [AJD] Another trivia question - Pre-Screeners??

> Duane:
>
> Thanks for doing some research. I'm beginning to think that one of these
> superseded the other w/o a part number change. Intuitively I would think 
> the
> one with the round holes would be less expensive to make but I have never
> seen the manufacturing operation that makes the stretched metal diamond
> shape. I would assume they are stamped in flat sheets. The diamond shape
> would let less large junk through but there is a fine screen over it. 
> Maybe
> in really dirty environments the fine screen had to be taken off?? I know
> when we had mounted corn pickers with the big add-on screen then went over
> the grills, it had to be policed quite a bit to avoid getting too full. I
> would think this might have been changed for better breathing in dirty
> environments. I would hate to venture a guess as to which design is 
> better.
>
> Haven't been able to get hold of my brother yet but will keep trying. My
> hazy memory is he modified the pipe on the pre-cleaner to shorten it for
> some reason. I don't recall why now. Maybe it was higher than the top of 
> the
> exhaust pipe or it blocked his view somewhat. He is much shorter than I 
> am.
> The 520 Pre-Cleaner bottom cast flange setup is quite different than the 
> 620
> version.
>
> It sure would be nice if we could trust the illustrations in the Parts
> Catalogs because they all show the round hole version for the 520 through
> 730.  The 4010/4020 PC shows the round holes too.
>
> Dean A. Van Peursem
> Snohomish, WA 98290
>
> Forbidden fruits create many jams!
>
> www.deerelegacy.com
>
> http://members.cox.net/classicweb/email.htm
>
>
>
> -----Original Message-----
> From: antique-johndeere-bounces at lists.antique-tractor.com
> [mailto:antique-johndeere-bounces at lists.antique-tractor.com] On Behalf Of
> Duane Larson
> Sent: Sunday, November 27, 2005 6:29 PM
> To: Antique John Deere mailing list
> Subject: Re: [AJD] Another trivia question - Pre-Screeners??
>
> Dean,
> FWIW, a May 1960 version of SM2039 for the 4010 shows a prescreener with
> round holes, as does an October 1963 SM2038 for the 3010.  Advertising
> brochure A1171-59-6 for the 730 also shows a "new prescreener attachment"
> with round holes.  This unit was not in 1958 or earlier brochures - only 
> the
>
> precleaner.  The prescreener does not appear to be in the accessories
> catalog AC1000 dated 10-58 but is in the 11-59 version.  It will be
> interesting to learn if the prescreener came on your brothers 520 or 
> whether
>
> he added it later.
>
> Since the screen was available separately from the prescreener unit, I
> suspect it was another low-bid deal for the screen which may have changed
> over the years.
> Regards,
> Duane Larson
>
> ----- Original Message ----- 
> From: "Dean VP" <deanvp at att.net>
> To: "'Antique John Deere mailing list'"
> <antique-johndeere at lists.antique-tractor.com>
> Sent: Sunday, November 27, 2005 4:13 AM
> Subject: RE: [AJD] Another trivia question - Pre-Screeners??
>
>
>> Greg:
>>
>> I think I have run on to a bit of evidence that may be of significant
>> importance. My brother owned a 1957 520 since it was new. He just sold it
>> a
>> couple years ago. I found the picture I took of it. It has the round hole
>> Pre-Screener on it.
>>
>> I'll have to check with him to see if he ever replaced it or changed it
>> from
>> when it was new. I doubt it sincerely. I think he will remember whether 
>> he
>> did or not. But here is a tractor I know the history of. Now that I look
>> at
>> this I seem to recall this was one of the reasons I had drawn my previous
>> conclusion.
>>
>> Dean A. Van Peursem
>> Snohomish, WA 98290
>>
>> Forbidden fruits create many jams!
>>
>> www.deerelegacy.com
>>
>> http://members.cox.net/classicweb/email.htm
>>
>>
>>
>> -----Original Message-----
>> From: antique-johndeere-bounces at lists.antique-tractor.com
>> [mailto:antique-johndeere-bounces at lists.antique-tractor.com] On Behalf Of
>> greg at theoldtractorcompany.com
>> Sent: Saturday, November 26, 2005 10:23 PM
>> To: Antique John Deere mailing list
>> Subject: RE: [AJD] Another trivia question - Pre-Screeners??
>>
>> The more I think about it, the NOS ones I had some 5-10 years ago were
>> diamond I'm pretty sure.
>> But again we're faced with the possibility that they were NOS replacement
>> prescreeners and not
>> NOS production prescreeners.
>>
>> You would think something like this would be a snap to nail down wouldn't
>> you?
>>
>> I'll take a look upstairs and see what the NewGen prescreeners are next
>> week. Pretty sure the
>> one I just sold for a 5020 was diamond though. More conflicts!
>>
>> Greg
>>
>>
>>
>> Greg Stephen
>> The Old Tractor Company
>> Stephen Equipment Company
>> PO Box 709
>> Franktown, CO 80116
>> 303-663-5246
>> 303-468-0377 FAX<<--GREAT WAY TO REACH ME!
>>
>> On Sat Nov 26 21:32 , 'Dean VP' <deanvp at att.net> sent:
>>
>>>Greg:
>>>
>>>I took your suggestion of looking at pictures. Gathered lots of data and
>> now
>>>have my feet firmly planted in mid air. I have over 100 pictures of 520's
>>>through 730's stored on my system. Of that probably 50% had Pre-Cleaners
>> but
>>>only 4 Pre-Screeners. Two were vary obviously the round hole type. The
>> other
>>>two the tractor was far enough away from the picture taker, I couldn't
>> tell.
>>>Maybe those were the diamond type because I couldn't see the holes.
>>>
>>>So your suggestion, although being a good one, didn't yield any kind of
>>>conclusive results.
>>>
>>>Another mystery to be solved.
>>>
>>>Dean A. Van Peursem
>>>Snohomish, WA 98290
>>>
>>>Forbidden fruits create many jams!
>>>
>>>www.deerelegacy.com
>>>
>>>http://members.cox.net/classicweb/email.htm
>>>
>>>
>>>
>>>-----Original Message-----
>>>From: antique-johndeere-bounces at lists.antique-tractor.com
>>>[antique-johndeere-bounces at lists.antique-tractor.com','','','')">antique-j
> o
>> hndeere-
>> bounces at lists.antique-tractor.com] On Behalf Of
>>>greg at theoldtractorcompany.com
>>>Sent: Saturday, November 26, 2005 6:39 PM
>>>To: Antique John Deere mailing list
>>>Subject: Re: [AJD] Another trivia question - Pre-Screeners??
>>>
>>>Dean
>>>Has been a hectic week and I just ate far too much turkey again but I
>>>thought the diamonds were
>>>earlier. I do have some New Gen precleaners that are diamond too so I'm
>>>not
>>>sure. What do pics
>>>of other tractors show? Seems like I would remember seeing a 730 w/round
>>>hole prescreener
>>>though.
>>>
>>>Greg
>>>
>>>
>>>
>>>Greg Stephen
>>>The Old Tractor Company
>>>Stephen Equipment Company
>>>PO Box 709
>>>Franktown, CO 80116
>>>303-663-5246
>>>303-468-0377 FAX
>>>
>>>On Sat Nov 26 11:22 , 'Dean VP' deanvp at att.net> sent:
>>>
>>>>Over the years I have looked for a couple good used Pre-Screeners and
>>>>have
>>>>found and installed one on my 620. At the time I came to the conclusion
>>>that
>>>>the can type with the round holes were for 20 and 30 series and the
>>>>stretched metal - diamond type holes were for the New Generation
>>>>tractors.
>>>>Since I was buying used I didn't know the exact Part Number for what I
>>>>was
>>>>buying. The Parts Catalog illustrations for the 520 through 730 show the
>>>>round hole type but I am aware that these illustrations cannot always be
>>>>trusted for accuracy. But up until the following two eBay auctions I
>>>thought
>>>>I had come to the correct conclusion.
>>>>
>>>>The two eBay auctions are just the reverse of my thinking.
>>>>
>>>>7564613408 - Round holes. New Generation.
>>>>
>>>>7564613448 - NOS Stretched metal - diamond holes. 520 - 730
>>>>
>>>>Now I suspect since the second one is NOS and has the part number on the
>>>box
>>>>there is a good chance this is right.
>>>>
>>>>But it is totally reversed from my previous conclusion.  Does anyone on
>> the
>>>>list have a clear precise definition as to what was used when? Or did JD
>>>>make a change during production w/o changing Part Numbers? Or were both
>>>>types used interchangeably?
>>>>
>>>>
>>>>Dean A. Van Peursem
>>>>Snohomish, WA 98290
>>>>
>>>>Forbidden fruits create many jams!
>>>>
>>>>www.deerelegacy.com
>>>>
>>>>http://members.cox.net/classicweb/email.htm
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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>>>
>>>
>>>
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>>
>>
>>
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