Loss of power

   / Loss of power #1  

JonStarr

New member
Joined
Aug 10, 2014
Messages
4
Location
rumford
Tractor
New Holland
Hello,

My New Holland 1725 has recently been losing power, as if there is a fuel issue. It always starts fine and runs perfectly well for at least 20 minutes, then the rpms will drop for a second or two, at first at wide intervals (20 minutes or so). Within an hour, these drops start happening more frequently and last longer--5-20 seconds. Sometimes they become so frequent and the power drops so low that I have to shut off the tractor and walk away. An hour or two later, it will restart as if nothing happened. I've been brush hogging a thin, weedy field with it; it seems to happen more uphill (but not always) and is partially cured by taking the load of the engine, by resting out of gear or with the PTO disengaged several seconds (but not always!).

What I have done: Air and fuel filters replaced at start of season (problem started last fall). Ran a pint of Sea Foam through with a tank of gas--1/2 way through the second tank with this treatment in it now. I also blew clean the tank cap, thinking it might be clogged--this had no effect, but loosening the cap seemed to somewhat ease, but not fully solve, the problem (not convinced that was not a coincidence, but I will get a new cap).

What problem can this be that always goes away by the time I restart the tractor, that seems somewhat but not always connected to power demand? It has happened driving along on level ground without an attachment running. Thanks in advance for any advice!

Jon
 
   / Loss of power #2  
Try a moisture dissolver like Power Service 911 Red Bottle. Moisture can be a quirky thing with diesels. Are the fuel lines tight from the pump?
 
   / Loss of power #3  
Definitely sounds like a fuel flow problem.
Is there a fuel screen (mesh) at the bottom of the fuel tank?
Could be clogged or broken.
Is the fuel shutoff fully open? ( I had this, most embarassing)
Blow out the lines, check fuel connections.
 
   / Loss of power
  • Thread Starter
#4  
Thanks, Roman. I've already run a good deal of 911 through, and always add a bit with each tank anyway. Will double check the lines.
 
   / Loss of power
  • Thread Starter
#5  
Bajabum--yes, it sounds like a fuel flow issue--if only I could find it!!! The fuel screen is a good thought. I'll check for one. Thanks.
 
   / Loss of power #6  
Not sure if you got to the bottom of your fuel issue but I just had a similar problem with my TC40d. The fix was the fuel pump.

The tractor was fine under small loads but as soon as I put it to work it would bog down and quit. Mine wasn't waiting until it warmed up like your is, but it sounds similar.
 
   / Loss of power #7  
Had this symptom on a lawn mower one time and discovered that the ignition coil got weak when it got hot and the engine would lose power and eventually shut down as the spark plug would stop firing. Don't know if your tractor has similar but might be worth a check.
 
   / Loss of power
  • Thread Starter
#8  
Thanks for your advice, everyone. The problem "went away" after about twenty hours of use and several pints of Seafoam. Chalking it up to gunked up injectors, or an indian curse on the field I was brush hogging in.
 

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