770 engine power loss
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Thread: 770 engine power loss

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    770 engine power loss

    I’m new to the forum - been a computer user for decades but searching this forum is not producing results - suggested instructions?

    I have a 770 with 400 hours on it.

    Although not many hours for its age I have changed the fluids several times over the past 10 years.

    I borrowed a 48” 3 point field mower and have been mowing for about 15 hours, running at 2,600 RPM. Suddenly the power of the 23 HP engine dropped (RPM down to 2,300) while mowing up a slight incline. The engine seemed to have a ‘mis’ (but no stuttering). Even putting the rig in neutral did not clear it up, however after taking the load off and maintaining full throttle the ‘mis’ clears up in a few minutes.

    I pulled the air cleaners off and blew them out - while they were clean with I started the outside one was quite dusty - they both cleaned up good - I can see light through both.

    I thought it might also be something in the diesel; although I used PRD in all of my stored diesel and gas. But with that said I poured about 6 ox of seafoam into about 2 gallons of diesel in the full tank. I ran it and then let is sit for a couple of days.

    Back to mowing today and the same thing is happening.

    Injector? Seems that would be consistent.
    Fuel filter? Seems would also be consistent.

    Any suggestions would be appreciated.

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    Superglidesport's Avatar
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    Your 770 may have a fuel tank pick-up strainer or outlet fitting that's partially clogged. You may want to try disconnecting the fuel line from the filter assembly and blowing lightly back into the tank using compressed air. You could also drain the tank and view the bottom of the tank using a bright LED flashlight. Look for accumulated debris in the tank.
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    My first thought would be a partially clogged fuel filter that can't flow enough under load.
    -Blake

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    Quote Originally Posted by Superglidesport View Post
    Your 770 may have a fuel tank pick-up strainer or outlet fitting that's partially clogged. You may want to try disconnecting the fuel line from the filter assembly and blowing lightly back into the tank using compressed air. You could also drain the tank and view the bottom of the tank using a bright LED flashlight. Look for accumulated debris in the tank.
    Thank you! I will do that - I did remove the fuel filter and it was the culprit - in fact when I blew it out from the inside mud came off the filter fins, so I have no doubt that dirt is in the tank. I bought the tractor with 270 hours on the engine 10 years ago and I never even thought to check inside the tank - but I know you are right and I will do that in the next couple of days.

    Thanks so much!

    JC

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    Superglidesport's Avatar
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    Quote Originally Posted by JCgreenbluff View Post
    Thank you! I will do that - I did remove the fuel filter and it was the culprit - in fact when I blew it out from the inside mud came off the filter fins, so I have no doubt that dirt is in the tank. I bought the tractor with 270 hours on the engine 10 years ago and I never even thought to check inside the tank - but I know you are right and I will do that in the next couple of days.

    Thanks so much!

    JC
    I assumed you changed the fuel filter at some point in time. You may have picked up some algae in your fuel tank due to moisture accumulation. This might explain the "mud" you described when blowing out the filter. If you do see some black silt floating in the fuel then drain the tank fully, refill with clean fuel and add some "Bio" type fuel treatment. Here's some good reading: https://www.bellperformance.com/bell...lgae-treatment
    John Deere 3320
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    Curtis Hard Side Cab & Heater
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    54 Snowblower
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