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Massey Harris & Massey Ferguson Tractors Discussion Forum
:

Massey Ferguson 235 won't run

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mach9

06-08-2019 10:05:57




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Hello,
New member here looking for some help. Have '75/'76 235 that just shut off on me after running perfectly for an hour or so. Plenty of fuel. No warning. No unusual noises. Just like I pulled the fuel shut-off. Dragged it back to the shop to try to figure it out. It didn't seem like I was getting a lot of fuel from the transfer pump, so replaced the pump and filter. Have good flow from the tank. Primed the filter. Have good, clean flow from bleeder at filter using lever on transfer pump. Moved around to injection pump side. Open the bottom bleeder on the pump housing and, spinning the motor over, I have good flow at that bleeder. Moved up the the other bleeder, the one I guess on the governor housing and, absolutely nothing. Not a drop of fuel or a wheeze of air that I can tell. Tried it with fuel shut-off in and out, at WOT and at idle. Any idea what this is telling me? I took the cover off of the timing cover and the little inspection cover off of the pump to verify that the pump is turning and it is. I've looked at some you-tube stuff on this pump and I see there's a spring in the governor housing that controls throttle I assume. Is it possible that this spring broke? Whatever happened, happened suddenly and without warning. Thanks for any and all advice. Not a diesel guy to start with and am a little lost. Can't really afford to just pull the pump and spend $6-700 to have it built. Thanks.

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mach9

06-08-2019 16:57:29




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 Re: Massey Ferguson 235 won't run in reply to mach9, 06-08-2019 10:05:57  
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I did check the bleed/return line and it seems to be clear. When you say vent screw, is that the fitting that the bleed screw screws into? No, haven't done that. Will try that tomorrow and check all lines again. But its starting to sound like the pump is going to need to come off. Thanks for advice guys.



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ptfarmer

06-08-2019 12:19:37




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 Re: Massey Ferguson 235 won't run in reply to mach9, 06-08-2019 10:05:57  
There should also be a small fuel bleed line running from the top of the filter housing to the fuel tank. Make sure that line is clear, and not stopped up.



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ptfarmer

06-08-2019 12:16:20




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 Re: Massey Ferguson 235 won't run in reply to mach9, 06-08-2019 10:05:57  
When you remove the top cover you should get a flood of fuel out it as it all runs in fuel. Maybe you have something in the fuel tank that is restricting the outlet of fuel out the tank, so it's only allowing a certain amount of fuel out until it plugs itself up again.



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mach9

06-08-2019 12:02:27




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 Re: Massey Ferguson 235 won't run in reply to mach9, 06-08-2019 10:05:57  
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Yes. I've run into that o-ring in the filter deal before. Took me a couple of hours to figure that out. I took that top cover off of the pump just to have a look. The spring is good and everything else looks ok as far as I can tell. It looks to me in order to get fluid out of the top bleed screw, that whole governor area under the cover should be flooded with fuel. I didn't get even a drop of fuel when I unbolted the cover. Is this an indication of anything? Thanks.

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Dieseltech

06-08-2019 13:45:01




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 Re: Massey Ferguson 235 won't run in reply to mach9, 06-08-2019 12:02:27  
Did you remove the top bleed fitting, back the vent screw out one turn and blow air through it? I've seen some plugged with rust on pumps I've torn down for repair.



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Dieseltech

06-08-2019 10:27:55




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 Re: Massey Ferguson 235 won't run in reply to mach9, 06-08-2019 10:05:57  
If the injection pump hydraulic head is seized, the drive to the pump will be OK. HOPEFULLY it's not seized. You SHOULD have flow at BOTH injection pump bleed screws USING the hand lever. The bottom screw is most important, top one can be bled later. If using NAPA/WIX fuel filters, MAKE SURE there's NO O ring in the filter top OUTER groove next to the sealing lip, that's the inlet passage on that filter and MUST be open. I can repair most pumps like yours for 300-400, long as the head and cam ring are good.

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