MF 4243

shanewhiz · Sep 2, 2023

can anyone help me troubleshoot an electronic tach that just quit working? I've checked all the fuses under the dash. Is there a magnetic type switch that screws into the block.

used red MN · Sep 3, 2023

On the AGCO online parts catalog searching
..tachometer.. shows nothing about a rpm sensor or
speed pickup. I know in some designs the alternator
provided an electronic signal for the tachometer. Doe
your owners manual show a wiring diagram?
AGCO MF 4243 parts catalog

caterpillar guy · Sep 3, 2023

If it has an electric pickup sensor I would expect it to be either on the flywheel housing or at the timing gear cover since both would work for that. The sensors have to be within a certain clearance from the spinning item to work. Usually screwed in to touch then backed out a partial turn and thread coarseness would dictate how much of a turn. I'll go out on a limb here and guess that the sensor can be checked with an Ohm meter for continuity or not to determine if it is good or not.

2290 · Sep 3, 2023

shanewhiz,

The rpm sensor is mounted on the right side down by the tandem pump it is easy to see. They do have to be adjusted if you install a new one. They have been known hit the pickup/wheel on the inside.

Marlin

2290 · Sep 3, 2023

shanewhiz

Sorry,I was thinking of the pto sensor.

Marlin

oldwrencher · Sep 3, 2023

I seem to remember that the sensor for the tach on the 4243 is on the flywheel, and clutch dust gets on it periodically and it simply needs cleaning to work
again. I do not remember where exactly it is, but if it reads off the flywheel such could happen.

MF 4243

shanewhiz

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used red MN

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caterpillar guy

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2290

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2290

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oldwrencher

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