H won't make rated speed

big a · Jun 16, 2011

Been tearing my hair out with this. Engine hi idle speed will only make about 1650 rpm. Made all adjustments according to I&T manual, replaced governor spring. Still no change. It acts like it needs to be able to stretch the spring further to get more RPM, but the arm inside is maxxed out on travel. It is actually hitting the front of the governor cover, the high idle adj screw is backed out, and not touching the stop.
Removed governor and disassembled and inspected things, expecting everything to be totally shot. To my suprise, it is in great condition, bearings good, weight pin holes tight, thrust washer, bearing and sleeve all good.and tight.
It operates good and governs well, just too slow. Throttle is synched with the linkage and not binding. I can grasp the throttle linkage and speed up the engine, so I KNOW it will run faster.

I am at a total loss here. Any ideas?

Anonymous-0 · Jun 17, 2011

How much more Rpm do you want ? Farmall H is governed at 1650 rpm from factory.

big a · Jun 17, 2011

My manual indicates it should be 1815 RPM.

Anonymous-0 · Jun 17, 2011

International specifications speed rated full load governed range,RPM 900 to 1650. These are International specs.

Allan in NE · Jun 17, 2011

Points worn towards too much dwell. Which translates into late ignition timing.

Allan

big a · Jun 17, 2011

1650 is rated load speed. I am unable to obtain the no-load, hi idle speed of 1815 RPM.

mkirsch · Jun 17, 2011

Are you looking at the correct manual?

Nebraska test #333 indicates the maximum rated RPM for the H is 1650.

big a · Jun 17, 2011

Actually, I just had distributor off, and freed up the advance. Inspected points and regapped them.

I attached the spring over the pins that held the original governor spring, and was able to get enough tension that way to get my 1815 hi idle speed, but it will not idle correctly this way. Spring pin holes are not worn.

D Slater · Jun 17, 2011

If you are speeding it up to no load rpm by hand below the vent cover and the external and internal lever is to maximum travel with stop bolt backed off? Its still not adjusted correct, worn linkage, spring still weak, binding governor bearing sleeve or incorrect parts. Make sure the fork and bearings from spring to throttle linkage moves free on piviot shaft.
Also check that a power unit governor wasn't installed in the past.
Also did the old spring have a yoke and pin?

LA in WI · Jun 17, 2011

Take a GPS unit with you when you drive it wide open on the road. If you are hitting 16-18 mph (depending on size of tires) then you have a properly running H. My H runs 17 mph with my GPS. They ain't race cars...they're tractors.
LA in WI

dhermesc · Jun 17, 2011

Has the engine been overhauled (or at least the governor)? Expecting factory specs 55+ years after leaving the factory is pretty optimistic.

big a · Jun 17, 2011

How do I identify power unit governor? I am speeding up the engine at the vent cap area.
This one does have the trim screw on the back. Tractor s/n is 104,000 range.
Old spring was pinned at the ends, new one has hooks.
P/N installed was 49407DBX. Spring hooked through holes now.

I agree it seems like a wear or binding issue, but everything seems to be in great conditiion. Starting to agree with the wrong parts installed scanario.

Engine is in top shape, 150+ psi compression on all 4.

Not trying to turn it into an M. Need correct pto speed to run a 10K standby generator.

D Slater · Jun 17, 2011

Try to find a number on the spring fork and see if it matches a H #. If you can open the carb butterfly on up at the top of the governor the spring is not pulling the fork far enough or its not moving far enough for some reason.
Engine off throttle wide open the top link is adjusted to open carb butterfly wide open?

pete 23 · Jun 17, 2011

When you said you attatched spring over original pin and was able to make full rpm, that make me think you still have part of the old spring link in place. You should have no part of that original spring and be hooked in just the eyes on both the fork and the lever. Normally no problem to get full 1815 rpm long before arm touches govenor. Only one I remember was my dad's 52 H (which is mine now) when I was a kid it kept getting slower than the 45. He would have the local dealership speed it up and pretty soon it was running slow again. Well, end of story the spring was just stretching and failing until it broke. Then me and my brother put a new spring in it and ran the two H's up and down the road in fifth gear until they matched speeds since we of course had no tachometer.

big a · Jun 17, 2011

[quoteLinkage is adjusted so that, with engine off, throttle lever wide open, The pin can be inserted when carb butterfly is wide open.
It just acts like the governor does not have enough travel internally, like the thrust washer, or sleeve and bearing assembly are too short, but they dont have any abnormal wear.
Been wrenching for years, and I am stumped here.
Thanks for all the suggestions guys.

big a · Jun 24, 2011

Ordered a second governor spring to try, but have some more questions. The thrust washer should be 1/8" thick? Brass sleeve about 1.130" OAL?

A few other observations:
when the governor and carb linkage are synched according to the manual, the clevis is threaded all the way to the bottom of the rod. Seems odd to me.

Also...at idle the weights fly out far enough to hit the governor spring. I am growing confidet that I have the wrong spring.

H won't make rated speed

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