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Subject: Piston for 2n hydraulic pump

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Rich    Posted 12-29-2020 at 14:11:04 [URL] [DELETE]        [Reply] [Email]  
  • Piston for 2n hydraulic pump
  • Hello All my question is on me hydraulic pump the two piston that came out are square all the way around. I just bought two new ones from Just8N and they have this extra grove or guide piece in it and i have no clue on what they are for. Can i cut them off or what are they for? As i said my original ones don't have them and one is broke so i bought the new ones.Looking for suggestions.
    Thanks Rich

    TheOldHokie    Posted 12-30-2020 at 20:38:06 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Piston for 2n hydraulic pump
  • Here you go - at about 9:30 in on this video Bundy Bear describes installing the guide rails in the Ferguson pump.

    TOH

    https://youtu.be/TsxVUbgl2PE

    JMOR    Posted 12-31-2020 at 12:36:16 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Piston for 2n hydraulic pump
  • Very good! I don't see much need for those guide rods/slots, myself, as it would seem that the yoke/piston assy is well located by the yoke drive and pistons. What do rods/slots add?

    Tim Daley(MI)    Posted 12-31-2020 at 17:11:56 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Piston for 2n hydraulic pump
  • The grooves are shown on the yoke pins in all the MPC's, p/n 9N-615, but no mating part shown nor listed. When I find time and a pace to do it, I'll pull a pump apart and take a closer look.

    Tim Daley(MI)

    TheOldHokie    Posted 12-31-2020 at 14:12:34 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Piston for 2n hydraulic pump
  • JMOR asks: What do rods/slots add?

    At a minimum they add complexity and cost. ;-)

    TOH

    JMOR    Posted 12-31-2020 at 14:56:52 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Piston for 2n hydraulic pump
  • Probably why Henry dropped them. :)

    TheOldHokie    Posted 12-31-2020 at 08:36:03 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Piston for 2n hydraulic pump
  • I will offer a WAG. I don't know "what they are for" but if I would guess based on appearance I would say they are guides for the lateral movement of the scotch yokes. I have never had one of these pumps apart but AFAIK they are not used on the Fords - possibly used on Fergusons. I don't think they will hurt a thing and would leave them alone.

    TOH

    Tim Daley(MI)    Posted 12-30-2020 at 05:59:17 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Piston for 2n hydraulic pump

  • HiYa Rich-
    Correct me if I'm wrong, but I think what you are trying to describe is the original 9N,2N, and 8N hydraulic piston which used three steel rings (see item 'K' from page), similar to the engine pistons. When the NAA (Jubilee) was released in September, 1952, it had a new hydraulic system and it was revamped with a new piston as well but now used a single rubber O-RING with a leather back-up wiper/seal. The new Piston is the same size, 2-1/2" diameter as the previous 3-Ring 9N-530, now as part number NAA-530-B; O-Ring is p/n NAA-533-A; and Back-up Washer is p/n NAA-473-A. The new NAA parts will work on the older 9N, 2N, and 8N cylinders. It was a better design, and many times fellas will replace the old style with the new style when rebuilding the system. See scan below of the Dennis Carpenter catalog with these parts. Note the later cylinder and piston was 3" in diameter and the p/n NCA-530-B so don't get anything with an "NCA" prefix. I highly advise to replace your 2N with the new style Piston & O-ring AND get a new cylinder as well. A big reason why Ford switched to the O-Ring piston was that the prior 3-ring piston would gouge the cylinder walls over time especially if the oil was low or run dry. You should also get copies of the ESSENTIAL MANUALS for your shop and/or coffee table. We have some in our MANUALS forum you can download for free -you'll need Adobe to do so, also free -see menu. You can get all your new parts at Carpenter or Just8Ns. Here is a good D-I-Y video on the Ford N-Series hydraulic repair as well. Removing the top cover is a big time consuming job and the 9N/2N system is different than the 8N.

    DENNIS CARPENTER FORD TRACTOR REPRODUCTION PARTS:

    FORD 9N/2N ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:

    Tim Daley(MI)


    TheOldHokie    Posted 12-30-2020 at 12:53:07 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Piston for 2n hydraulic pump
  • I believe he is talking about the scotch yokes in the hydraulic pump and the tab on the top.

    TOH

    Tim Daley(MI)    Posted 12-31-2020 at 08:21:59 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Piston for 2n hydraulic pump
  • yeah, I thought of that too but waited to hear back from him. Didn't want to make any WAG's...

    TheOldHokie    Posted 12-30-2020 at 12:57:30 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Piston for 2n hydraulic pump
  • Better picture.

    TOH

    Zeke (OR)    Posted 01-11-2021 at 12:09:04 [URL] [DELETE]        [Reply] [No Email]  
  • Scotch yoke
  • Why is it called a “Scotch Yoke”? Are you supposed to drink while you install/remove it?

    Zeke (OR)    Posted 01-10-2021 at 22:40:26 [URL] [DELETE]        [Reply] [No Email]  
  • Scotch yoke
  • Why is it called a “Scotch Yoke”? Are you supposed to drink while you install/remove it?

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