JD4410 Tachometer stuck on 2000RPM: John Deere Review  -- John Deere Tractors Discussion Forum and Review JD4410 Tachometer stuck on 2000RPM: John Deere Review -- John Deere Tractors Discussion Forum

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 11-23-2007, 21:56 Post: 148670
barrycan5



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 JD4410 Tachometer stuck on 2000RPM

Just purchased a low hour JD4410 Compact Utility Tractor and when I turn it on, the tach immediately shows 2000 RPMs and will not change until I turn the tractor off when the tach returns to zero. The throttle works okay - the engine revs up or down as the throttle is moved up or down. The tachometer however will not move from 2000RPMs.
Any ideas on solving this problem !!






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 11-23-2007, 22:46 Post: 148671
kwschumm



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 JD4410 Tachometer stuck on 2000RPM

The technical reference manual is your friend Smile

The tachometer circuit is pretty simple. Pulses are sent from the P terminal of the alternator over a dark green wire to the instrument panel (X8 connector, terminal F). With key switch in run position, engine off, parking brake locked, and X7/X8 instrument panel connectors disconnected do these tests: Connector X8, Terminal A (Red wire) should measure battery voltage, if it doesn't test F5 fuse and see if voltage is there. Connector X8, Terminal F (Dark Green wire) should measure 0.04 volts, if not check that wire out to the P terminal of the alternator. Connector X7, Terminal A (Yellow wire) should measure 0.45 volts. Connector X8, Terminal D (Black wire) should measure continuity to ground. If that all checks out the instrument panel may be bad. If you have a way to measure pulses (scope, frequency counter, etc) it seems to me it would be reasonable to tee off the P terminal and see what the pulse data shows. If it varies with engine speed all the way to the tach the instrument panel is most likely bad. You could examine it for bad solder joints or burnt components before replacing it.






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 11-24-2007, 06:17 Post: 148675
earthwrks

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 JD4410 Tachometer stuck on 2000RPM

KW, my blue's tach pegs to full RPM when engine off and I turn the key to RUN without starting it, then goes to zero. Is this an indication of bad things to come or normal?






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 11-24-2007, 11:27 Post: 148684
kwschumm



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 JD4410 Tachometer stuck on 2000RPM

EW, I can't answer definitively but my guess is that it's normal. Or maybe not. Where's that blue tech ref manual when I need it? Smile






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

Thread 148670 Filter by Poster:
barrycan5 1 | earthwrks 1 | kwschumm 2 |




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