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

Sun Nov 27 21:00:48 PST 2005

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superseded the other w/o a part number change.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
>>>
>>>
>>>
>>>
>>>
>>>
>>>_______________________________________________
>>>Antique-johndeere mailing list
>>>http://www.antique-tractor.com/mailman/listinfo/antique-johndeere
>>
>>
>>
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