Can one observe the rack traveling to far though any of the covers on the pump or do you know if there’s a certain spec for max travel. I suspect some one has monkey with it in the past because there was no secondary spring pressure as the screw bar came to a stop. Will that make the throttle pedal very aggressive? I fixed that and it seems easier to easy into it after a shift. I hear people talk about completely removing the screws…it would seem like that would have to go considerably past the sweet spot and or cause damage but never heard one say it did, but then people usually don’t like to admit they fed it up. Or maybe that’s not a problem on the older pumps.
3406b questions
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by W923, Apr 17, 2024.
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I set my big motor to spec. It wouldn’t start a load or pull a big grade without moving the pedal for nothing. I checked and rechecked everything. New govnor spring and over run spring again just to be sure. Weights races etc. it just wouldn’t do it. It would run like a banshee but was hell to get rolling softly. Checked FTS 3 separate times with the CAT tools. In the end went back to my poor boy ways of doing it. I was a full turn off. I went in a half it got noticeably better. That next half turn made it where you can almost dump the clutch loaded at idle and not kill it.
sorry for the book but I’m not good at explaining things. Hopefully you get something useful out of thatSons Hero, W923 and Deere hunter Thank this. -
I disagree at @wore out. You are very good at explaining things and very easy to follow. Continue on my friend.
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Pretty sure this is the one you are talking about and I can with the fuel solenoid on push the rack bar towards the rear of the truck with a screwdriver. I then backed the fuel screw out about 7 more turns and began turning it in with just my fingers tips on the t handle allen wrench. I never felt anything but maybe I missed something….because of your comment about being too far out actually hurting power I ran it in 2 turns from where it was before I played around with it this time and lost about 6 psi boost. So the next trip I backed it out 3 turns ( 1 ) turn further than my starting point and gained back all the boost plus a little so I backed it out another turn. Makes about 35-37 and will put a hurting on my buddies isx supposed to be 550. Seems as though I have found a good stopping point. I guess since it’s still gaining I can be sure it’s not burring the rack??
wore out Thanks this. -
W923 Thanks this.
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