Ford 8830 RPMS

ford401 · Apr 30, 2022

just got my gauge pod back from AG express, was out with a 4 shank ripper working and my dash was telling me I was running 3000+ Rpms at near full throttle. This is way to high correct? Tractor didnt really seem to be running that high of RPMS. Injection pump is original, never touched. How else could I test RPMS?

root · Apr 30, 2022

(quoted from post at 16:51:13 04/30/22) just got my gauge pod back from AG express, was out with a 4 shank ripper working and my dash was telling me I was running 3000+ Rpms at near full throttle. This is way to high correct? Tractor didnt really seem to be running that high of RPMS. Injection pump is original, never touched. How else could I test RPMS?

Get a hand held tach from Amazon. Put a marker on your pto and read the rpm there. When your pto reads 540 see what the tach says. That will show you how much its off.

Bern · Apr 30, 2022

I doubt it's really running that fast. What is your idle speed?

Speed sensor should be screwed onto the back of the injection pump. Check to make sure it's tight and not bouncing around. Check the wiring connector to make sure it's secure also.

ford401 · May 1, 2022

(quoted from post at 17:24:19 04/30/22) I doubt it's really running that fast. What is your idle speed?

Speed sensor should be screwed onto the back of the injection pump. Check to make sure it's tight and not bouncing around. Check the wiring connector to make sure it's secure also.

It idles (gauge bounces) anywhere from 800-1400. If I push throttle all the way up the gauge reads well over 4000.

Bern · May 1, 2022

If the engine really ran at 4000 RPM, I can tell you that it wouldn't do so for very long, as the rods and pistons would be looking for the exit sign.

The best way to tell where the problem lies is by monitoring the AC waveform from the speed sensor with a scope, which is what I would do. Lacking that, if you have a meter that reads AC frequency, backprobe the signal wires from the speed sensor and note that the frequency is proportional to the engine speed (e.g. 1000 RPM = 400HZ, and 2000 RPM = 800 Hz). If the frequency rises smoothly with an increase in engine speed, then I would suggest you call the folks who recently repaired your dash and explain this to them. On the other hand, if the frequency bounces all over the place, you have an issue with the speed sensor.

ford401 · May 1, 2022

Haha thats what I thought! I just drove down the lane to hook it up to the plow and It was telling me I was at 7000rpm. So I guess its incorrect lol. Ill check speed sensor like you said first.

Jerry/MT · May 1, 2022

You have to know the gear ratio of the pto drive to get back to engine rpm with a pto tach. It may be marked at the tach.

chevytaHOE5674 · May 1, 2022

My 8830 was doing the same thing. One leg of the speed sensor goes to ground thru the harness and that ground was bad. So in the essence of time I cut the wire near the sensor and grounded it right to the starter. Always ment to hunt down the issue in the original harness but here it is 4 years later and its still grounded to the starter. Lol

Ford 8830 RPMS

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