1850 PTO RPM

[DaveNay]

Hi all,

I can't get the RPM up to full PTO speed on my 1850 gasser. PTO speed is 2400, but the best I can do is 1900-2000. I've tweaked the carburetor every which way but loose, and this is the best she'll do. I've cleaned the sediment bowl, and changed the in-line fuel filter. I've replaced the oil filter, and changed the plugs and wires (haven't done the points yet, might get an electronic kit). Full oil change and coolant flush, replaced the air filter and cleaned the radiator screen. Heck, I've even run a full tank of premium Shell gasoline through it, but still the best it will do is 2K RPM. When cutting hay or baling on a hot day, it will even drop down to 1600-1700 when it gets hot.

I have two suggestions already that I need to follow up on, and that is to check compression on the cylinders, and check the carb to make sure someone didn't put too small of a venturi diameter in there at some point in the past.

I have not made any adjustments to the governor yet, because that seems to be operating properly (by properly, I mean there is no surging, obviously if it is limiting the RPM, it's not working properly.)

I'd really like to achieve full 2400RPM for operating the cutter and baler this summer, but I'm all out of ideas.
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[BradWi]

our 550 had the same problem.I adjusted the linkage rod between the gov. and carb. a few turns to lengthen made a big difference.One other thing you may want to look at is your fuel cap, make sure it is vented or that the vent isn't partially blocked.this most likely is not the problem but it's an easy check.hope that helps!

 

[rrlund]

I think you're gonna have to adjust the linkage rod. Take the rod to the carb out of the governor lever. Shove the throttle lever all the way ahead (wide open). Adjust the rod so that it is about 1/3rd the width or the rod ahead too far to slide smoothly in to the hole.

 

[HeyPigFarmer]

Another thing to try is to tighten the external spring on the governor itself. If you are getting the full range of travel out of the governor itself (if you can push the throttle wide open with the tractor off and the throttle plate goes wide open) then you need to tighten the spring on the outside of the governor. Put an 1850 engine in a Super 88 frame once, cranked it to 3100 rpm and that thing would really pull.