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Thread: Pony Petcocks

  1. #1
    Join Date
    Nov 2006
    Location
    Central Maine
    Posts
    45

    Default Pony Petcocks

    Is there an easy source ( outside CAT) for pony motor petcocks? Mine do not seal any more and leak like a windowscreen in a submarine.....
    Charley
    '44 D2 5J 6987SP
    '57 D6 9U 25158
    and bunch of Farmalls

  2. #2
    Join Date
    Nov 2006
    Location
    Corralitos, Ca.
    Posts
    13,176

  3. #3
    Join Date
    Nov 2006
    Location
    Santa Cruz,CA
    Posts
    209

    Default

    I also use the ones from McMaster/Carr I find their #4793K64 works well.

  4. #4
    Join Date
    Jul 2016
    Location
    Lancaster CA
    Posts
    241

    Default

    Mine had a radiator drain cock on one side.
    Cat 12 grader, 8T running and restoring, Cat 12 grader 9K3585. parts machine, Adams leaning wheel Pull grader Mod # 28,

  5. #5
    Join Date
    Apr 2013
    Posts
    124

    Default

    3B9067 from CAT is $11.06 with new and improved for you convenience steel body with a plastic handle. The 4793K64 is all brass. Bob

  6. #6
    Join Date
    Nov 2006
    Location
    Central Maine
    Posts
    45

    Default

    Thank you! Iíll go for brass😊
    Charley
    '44 D2 5J 6987SP
    '57 D6 9U 25158
    and bunch of Farmalls

  7. #7
    Join Date
    Sep 2011
    Location
    Lance Creek Victoria 3995 Australia
    Posts
    202

    Default Petcocks

    Hi all
    Florin Tractors also has them, the ones from Cat are too big and will not screw onto the pony head.

    Regards
    Daryl
    RD4 4G4368
    D4 7J9915SP
    D4 2T6584SP
    R4 6G2554SP

    May you always be in the right place at the right time

  8. #8
    Join Date
    Nov 2006
    Location
    McBEE, SC
    Posts
    1,528

    Default

    Quote Originally Posted by doc_dozer View Post
    Is there an easy source ( outside CAT) for pony motor petcocks? Mine do not seal any more and leak like a windowscreen in a submarine.....
    You might be able to tune them up with disassembly, cleaning and lapping
    D2 5u & 3J
    212 9T
    RD4
    D4 7J & 7U
    R4 4G
    Gas 35's
    Diesel 35
    Diesel 40
    Gas 50's 5A
    Diesel 50 1E1755
    D 8800 power unit 9J 6113SP
    LeTourneau D4 tournapull/Q Carryall
    Letourneau D Carryall's
    LaPlant-Choate CAB-97

  9. #9
    Join Date
    Aug 2007
    Location
    Charlie Lake, BC. Canada
    Posts
    546

    Default

    mine have springs on them that is supposed to hold them tight, the valve is tapered and the spring keeps the tapered valve in the body. They get kind of gunked up with dirt and stuff and start to leak a little. i found you can dissassemble them and clean them up good, then stretch the spring a little bit to put more tension on it, and they work good again till the next time they get gunked up.

    a lot of the air tanks use on trucks had the same style of valves for draining water. i can get them cheap at napa and they come in 1/4. 3/8 and 1/2 inch npt thread.

  10. #10
    Join Date
    Nov 2006
    Location
    Central Maine
    Posts
    45

    Default

    I hadn't thought about refurbishing them. I'll pull them off friday and try it! Thanks!
    Charley
    '44 D2 5J 6987SP
    '57 D6 9U 25158
    and bunch of Farmalls

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