JD 650 tachometer troubles: John Deere Review  -- John Deere Tractors Discussion Forum and Review JD 650 tachometer troubles: John Deere Review -- John Deere Tractors Discussion Forum

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 09-09-2002, 16:44 Post: 42198
Angelo B.
2002-09-09 16:44:49
Post: 42198
 JD 650 tachometer troubles

We recently bought a JD 650 and have experienced problems with the tachometer needle going beyond the numbers on the tach face. Sometimes the tach works properly other times it almost spins around to the tach-stop. One dealer said its the cable another said it's the tach-head. Before I start taking it apart, anyone out there run into this condition before? It's my understanding that the 650 uses a mechanical tach. Thanks






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 09-10-2002, 08:42 Post: 42230
TomG

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 JD 650 tachometer troubles

I suspect it's the head. However, you might try taking the cable off and greasing it with white grease. The cable on my Ford 1710 was bent during a dealer repair and broke not long after I got the tractor back. I installed a new cable. As part of the installation, I pulled the cable apart and lubricated the entire length of the centre wire. Small chance but it might do the trick.

There is a however. There would be a small chance in some drive designs that if a drive was broken, pulling the cable end out could release a part that would drop into the oil pan. Its probably not much of a chance but something to be aware of.






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 09-10-2002, 10:33 Post: 42235
Angelo B.
2002-09-10 00:00:00
Post: 42235
 JD 650 tachometer troubles

Thanks for the suggestion. I was going to try as you suggested taking the cable out from the tach head. I'm going to see my dealer first to make sure if the cable's hanging on by a thread that the connection to the engine is not in danger of dropping any gear or drive mechanism into the engine.






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 09-12-2002, 06:51 Post: 42303
Mrwurm



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 JD 650 tachometer troubles

My John Deere 650 (now gone) needed to have the tach head and the cable replaced. Mine did not behave like yours. Mine would work some days and not on other days. I pulled my cable out many times to investigate the problem. I replaced the tach head myself and I can't quite see how any part of it would fall out.
Jerry






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 09-12-2002, 08:33 Post: 42307
TomG

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 JD 650 tachometer troubles

Jerry: It's a bit theoretical, but the drive end rather than the head end (Hope we've got the terminology straight) is the cable with a length of more or less square wire extending from it and a fitting. The wire extends into the tach drive. The drive on many tractors is taken off one of the gears under the timing-gear cover. In theory a broken drive part could remain on the tach cable end wire, and pulling out the drive end of the cable could allow the part to drop to the bottom of the timing gear cover, which is pretty much the same as in the crankcase.

Anyway, without knowing the particular drive design, I didn't want to recommend just pulling off the drive end of the cable without noting that there might be a small risk.






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 09-12-2002, 11:57 Post: 42314
Mrwurm



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 JD 650 tachometer troubles

Hey Tom, I see what you mean. I wonder if all drive heads are similiar. The drive head on my 650 was a right angle drive. The flat piece of cable went into a gear that turned another gear that was 90 degrees to the first. The second gear had a small shaft that went into the block just below the water pump. It's possible that this small shaft could break off and fall in the engine, but the gear it was pressed on was too big to fit in the hole. Just my random thoughts and observations.
Jerry






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 09-16-2002, 15:27 Post: 42493
Angelo B.
2002-09-16 00:00:00
Post: 42493
 JD 650 tachometer troubles

I checked the cable and the tachometer and it appears the tachometer is the problem. Any suggestion where I can get a tach at reasonable price? the dealer wants $144 for it which is more than i'm willing spend. any suggestions?






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 09-16-2002, 16:40 Post: 42497
MRETHICS



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 JD 650 tachometer troubles

I'm not being sarcastic here, but the problem still seems like a drive problem to me. We haven't seen a failed tach with those symptoms......yet anyway, who knows what tommorow will bring?

Ive seen cables that would only bind when bent excactly like they were installed on the tractor. I have also seen drive coplers that were loose enough they would cause the tach to jump.

Might want to double check.






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 09-18-2002, 16:20 Post: 42590
Angelo B.
2002-09-18 00:00:00
Post: 42590
 JD 650 tachometer troubles

No sarcasm taken. Any insight you can offer is helpful. I notice the lower cable connection was loose when I first checked it but tightening it didn't seem to make a difference. The cable's spinning fine at the top (where it connects to the tach head) and there doesn't appear to be any cable damage. One thing I notice was apparently the cable had been lubricated with oil and there was oil on the light bulb in the tach housing. Any other suggestions?

One thing I'm thinking of doing is seeing if I can find someone who deals in old or used JD parts to see if I can pick up an inexpensive tach head. Any thoughts?






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 09-18-2002, 16:42 Post: 42594
MRETHICS



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 JD 650 tachometer troubles

ok.......

That oil in the tach head bothers me some..It could cause the head to malfunction.

But also, it's hard to look at a spinning tach cable and see any rpm spikes wich would cause the tach to jump off the scale.

I don't know of any salvage yards that handle compacts...in my area anyway, but maybe soemone else knows of one.






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

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Angelo B. 4 | mack 2k 1 | MRETHICS 3 | Mrwurm 2 | TomG 3 |




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