N Board Forum - Expanded Thread Page

Subject: 621 carb

[Back] [Return to Top of Forum]

Doug    Posted 07-05-2020 at 11:12:43 [URL] [DELETE]        [Reply] [Email]  
  • 621 carb
  • I have a model 621 that just wonít stay running. It is getting gas to the sediment bowl but will not make it to the carb. I have had the carb rebuilt it was ok for a while now itís acting up again. Is there a place I can ship the carb to to have it done again or what would you recommend for a replacement.

    Tim Daley(MI)    Posted 07-09-2020 at 14:40:24 [URL] [DELETE]        [Reply] [No Email]  
  • START THIS AGAIN
  • OK, Doug, now that it's clear the pix you sent me are not of the tractor you've been talking about, let's start all over. FORD made Special Industrial Models,, often referred to as 'tugs', that were 621 Models, with NO PTO/NO 3-PT, and had a Trans Cooler,Torque Converter, and Pintle Hook on rear. A few years ago a fella posted an article in The N-News on his 621 Industrial. Here's the LINK to an archived article on it. So are we getting closer to what you have?


    621 TUG:

    Tim Daley(MI)

    Doug    Posted 07-09-2020 at 15:10:39 [URL] [DELETE]        [Reply] [No Email]  
  • Re: START THIS AGAIN
  • i think Gaspump sent you the pictures i haven't sent any pictures. either way that is one sweet looking tug. i can only wish mine was that nice. yes that is the 621 i am having gas flow issues with.

    Jack - Iowa    Posted 07-09-2020 at 07:21:44 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 621 carb
  • Have you by any chance replaced the sediment bulb assembly? When I ordered one for my 860 the distributor listed one for 860/861. Wrong! The hole in the hollow bolt and the corresponding hole in the sediment bulb were on opposite sides. Small amount of gas would seep across and allow it to start and run a short time. When it stopped with a full tank of gas I KNEW something was wrong!

    Tim Daley(MI)    Posted 07-07-2020 at 10:53:01 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 621 carb
  • 620 Model - 134 CID Red Tiger Engine; the "2" signifies 4-spd trans, NO PTO & NO 3-pt lift; and the 3rd "0" digit defines a 1955-1957 model, the "1" digit defines a 1957-1962 model. Tach/Proofmeter was also never on the 620 models. Plug on dash lamp is new to me.

    Here are your pictures you sent me. S/N no doubt listed as a 620 Model, However, you say you have a PTO and 3-point lift. The 620's never had those. They were released as low budget models for use as city, county, state parks pulling mowers. If you have a PTO and lift maybe it was a mutt built by someone.

    YOUR PIX - FORD MODEL 620:



    Tim Daley(MI)

    Doug    Posted 07-08-2020 at 09:48:20 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 621 carb
  • i have a tach/proof meter on mine along with oil and temp. i have some type of red light under the oil pressure gauge. i have no clue how to get pictures on here or i would post a few.
    i pulled the banjo bolt out of the sediment bowl to the carb and tried turning it maybe it would help with alignment for the gas flow and tried with the gas cap off. still doesn't get a continuous flow of gas to the carb.

    Tim Daley(MI)    Posted 07-09-2020 at 10:22:24 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 621 carb
  • I see an OEM 80 PSI Oil Gauge but don't see any red light, never had one. Tach digital add-on is OK. Remove fuel line from carb intake and do a flow test. Fuel flows, yes? Issue is in carb. No? issue is upstream. You have an aftermarket carb but should be able to make it work. You need to read up in How-To's for loading pictures to posts. You need a 3rd party hosting site like IMGUR to store photos then copy the url from there and post in thread. You just can't try to add a picture otherwise. From what I have read in the books, a 620 had no PTO, Proofmeter, or 3-PT, and no mention of one being an option. If one wanted those items, they could order a 640 and get them as standard issue. I suppose anything is possible. Since your 620 has a Howard aux and a Sherman, that adds a bonus. Howard may or may not work and parts are not available. Shermans can be worked on. The FORD N's and HUNDRED Series Tractors all used Marvel-Schebler Carburetors. The 600 used the TSX-580 unit. The banjo bolt makes no difference, how it is inserted works one way and there is no bolt for the 134 engine and one for the 172 - both are same and used on 55-64 carbs. Like I emailed you, I can look at your carb and tweak the settings if you want but you can do it yourself as well - use your manuals. OEM M/S carbs pop up on ebay often but not cheap.

    Tim Daley(MI)

    Doug    Posted 07-09-2020 at 12:32:57 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 621 carb
  • the tractor in the pictures is not mine. i am referring to my 621 Tug. i will try one more time when i get a chance to try adjusting the carb. if i remove the gas line from the sediment bowl it flows freely, if i leave it attached and drop the glass bowl its self it flows freely. if i leave it all attached and remove the carb bowl plug it dumps out what is in the carb then stops flowing. i have cleaned the screen, it had a little crap in it but not a whole lot.

    Jack - Iowa    Posted 07-10-2020 at 07:09:33 [URL] [DELETE]        [Reply] [Email]  
  • Re: 621 carb
  • Most likely your float is stuck up. Try rapping on the side of the carb. Firmly but not real hard. It is a casting. Otherwise the needle valve may be stuck closed.

    Gaspump    Posted 07-07-2020 at 20:31:52 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 621 carb
  • PTO and hydraulic lift were not standard equipment on the 620 however they were available as optional equipment.

    Doug    Posted 07-08-2020 at 09:51:10 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 621 carb
  • hows about a torque converter? or was that just on industriel models?

    Tim Daley(MI)    Posted 07-06-2020 at 04:35:08 [URL] [DELETE]        [Reply] [Email]  
  • Re: 621 carb
  • HiYa Doug-
    So your tractor won't run at all? Do you have the OEM Marvel/Schebler TSX-692 carb? Is the OEM Fuel Shut-Off Valve intact or has it been replaced? Do you open the valve when starting and running? I would be willing to look at your carb for you but suspect it isn't your problem. Rebuilding all the major components on a Ford are highly recommended before even considering buying anything made 'new' today. If you carb passes the fuel flow test, chances are the root cause lies elsewhere, i.e. electrical. Many suspected fuel issues turn out to be electrical and vice versa. If glass bulb drains and engine stops running, you are not allowing fuel to get to carb so valve is closed or plugged.


    FORD 600 & 800 CARB & FUEL INFO; from OWNER'S MANUAL:


    Tim Daley(MI)

    Bruce(OR)    Posted 07-05-2020 at 18:44:09 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 621 carb
  • Tank not venting (?) pull the gas cal and try again.

    JMOR    Posted 07-05-2020 at 14:22:43 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 621 carb
  • Does not make a lot of sense to me, as there is nothing but a hollow bolt between sediment bowl and carb? Did you remove carb bowl drain plug and let it run out for 2 minutes into a pint jar?

    Doug    Posted 07-05-2020 at 17:02:17 [URL] [DELETE]        [Reply] [Email]  
  • Re: 621 carb
  • Yes, it runs out till the bowl is empty then nothing. But if I remove the gas line it flows freely. The screen on the sediment bowl is clean the banjo bolt is clear. I donít really get it either.

    JMOR    Posted 07-05-2020 at 17:46:57 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 621 carb
  • If a viton tip needle on float, it may be sticking to seat or float may not be free to move, maybe rubbing against side of bowl. Also, if you have flipped sediment bowl for a different line connection, I'm pretty sure the hollow bolt holes and sediment assy holes can have an alignment problem & restrict flow.

    [Back] [Return to Top of Forum]


    Top