Massey Ferguson 1740M Hydro: LOSS OF POWER when hot!

   / Massey Ferguson 1740M Hydro: LOSS OF POWER when hot!
  • Thread Starter
#71  
To clarify, in that Wed 6/19 situation a few hours ago, where you disengaged the mower and could not get the engine to rev on up to 2000 rpm... was that on the level, or up a hill ? .., in fwd motion with controls calling for more forward speed ? Not just sitting there, right ? I assume so...
It was stopped completely w no forward speed, level ground (no HST pedal), full throttle and maybe half RPM range achieved. I brought down then to an idle for maybe 2 minutes, then was able to get some throttle response, not full but enough to engage the mower. Then, with the mower up to 540 PTO range I proceeded forward and for 2 seconds it was normal then dropped RPMs with the mowing and forward speed.

I even put the gear in "N" (no HST), still logy but it finally regained strength, once I engaged mower it was kinda okay and slightly sluggish, but then after going back in gear (engaged moving forward) WITH mowing; just too much for it.
 
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   / Massey Ferguson 1740M Hydro: LOSS OF POWER when hot! #72  
Understood but no sediment bowl on the 1740M. No inline filter other than the 2 large spin on fuel filters, 1 is mounted low by the right foot step and has a built in plunger primer pump, then the other is up on the side of the engine block. Both have been changed as mentioned.
Roger that. Sounds so familiar though. If you have/have access to an endoscope, that's what I used to find my bug. It was laying there right by the fuel outlet. Could be worth a look 🤷‍♂️
 
   / Massey Ferguson 1740M Hydro: LOSS OF POWER when hot! #73  
This may be a stupid suggestion, have you tried leaving the fuel cap loose and or loosening/opening the fuel cap when the problem starts?
 
   / Massey Ferguson 1740M Hydro: LOSS OF POWER when hot! #74  
This may be a stupid suggestion, have you tried leaving the fuel cap loose and or loosening/opening the fuel cap when the problem starts?
yeah test for vent block.
 
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   / Massey Ferguson 1740M Hydro: LOSS OF POWER when hot!
  • Thread Starter
#75  
This may be a stupid suggestion, have you tried leaving the fuel cap loose and or loosening/opening the fuel cap when the problem starts?

I know with a gasser this would be a probable cause, not sure with a diesel BUT I can sure give this a try quite easily!

ON MY TO DO LIST! :)

Much appreciated and my next Mow will be ~this upcoming Sunday or Monday.
 
   / Massey Ferguson 1740M Hydro: LOSS OF POWER when hot!
  • Thread Starter
#76  
yeah test for vent block.
It does make sense kind of, with the tractor setting for an hour or so after the power loss it comes back for awhile, so the tank could of been vacuumed and hence the power loss (or in this case) fuel starving.
.
This will take the cake if this is it. And literally, I will eat a whole big fat cake to celebrate if this is it. Fingers crossed!
 
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   / Massey Ferguson 1740M Hydro: LOSS OF POWER when hot! #77  
After a lot reading, it really sound like engine is going into fuel starvation..... First I would be sure there was no vent block to cause a vacuum in tank and make fuel hard to draw.... If that does not work I would clean and inspect and blow out all lines and clean tank and change any filters and start over at least you would eliminate fuel system.... One thing to suspect may be any rubber lines or sections being sucked flat (deterioration) to cause limited fuel flow...Next would be fuel pumps..... It really sounds like something simple is being overlooked along the way....

Towit...

Have a JD riding mower that was the most miserable frustrating anger producing thing to get started.... Cleaned tank and fuel lines and changed filter and cleaned carb, nothing helped.... Final solution was to finally find a frayed section of fuel line, it would allow pump to drawn in air molecules as it was easier to draw than fuel molecules ... It was a microscope failure at fault and was based on size of air molecules vs fuel molecules.... Air molecules being smaller and pump would suck air in, but failure was so small its did not show up as a "wet" fuel leak........ Replaced fuel line and life is good....
 
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   / Massey Ferguson 1740M Hydro: LOSS OF POWER when hot!
  • Thread Starter
#78  
I went out and looked at the fuel tank and cap area. I see the overflow (back into tank) opening but I don't know where or what to look for as far as a vent goes. Is it built into the cap? I see no openings on the top of the cap.

IMG_4391.jpg
 
   / Massey Ferguson 1740M Hydro: LOSS OF POWER when hot! #79  
should be built into cap and most likely is hard to see.
run it, when it starts to fail leave running and pull fuel cap. wait moment then try working it. will rule out (most likely) vent issue.
as wranglerx mentioned could be collapsing /porous fuel line.
 
   / Massey Ferguson 1740M Hydro: LOSS OF POWER when hot! #80  
Your cap is different than mine and I can't see the entire thing. Looking at the picture of mine, see the shallow grove in the cap at the top of the image, this allows air up under the cap and above the rubber seal. The hole in the center of the cap allows the air to flow into the tank.

But Dave is right, to eliminate a blocked vent, if you unscrew the cap when the tractor acts up and power returns then the vent is blocked, or even partially blocked.
 

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