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 10-09-2003, 19:30 Post: 65910
dlamay



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 Shifting a new JD 990

I am a new JD 990 owner and I am completly satisfied except for putting the thing in any gear from neutral. If I have the engine running at 2500 rpms and depress the clutch all the way down and try to put it in any gear it grinds. Is this normal operation? It seems better if I rev the engine down to 1000 rpms or so and then put it into gear. I can understand the gears not be synchronized as my first tractor was a Ford 8N but this just doesn't seem right.

Am I missing something or do I have a problem??






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 10-09-2003, 20:34 Post: 65912
Chief



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 Shifting a new JD 990

First thing I would suggest is to check this out with your dealer. Sounds to me like your clutch may not be adjusted properly or the clutch is hanging up. This would be pretty unusual on a machine so new. Now if you let the clutch out in neutral at operating rpm and attempt to immediately engage a gear, you are going to grind. This is typical of gear collar shift transmissions. Usually holding the clutch in for an extra few seconds allows the gear shafts to slow down and allow a proper shift. I am not sure which is the case with your situation. If you cannot get the trans in gear without grinding under any circumstances, something is definitely wrong. Have you reviewed the owners manual for shifting gears? The manual makes an "important" box note about shifting:

Operating Collar Shift Transmission

IMPORTANT: Avoid damage! To prevent transmission damage:

Always depress clutch pedal when changing forward travel speeds while the tractor is moving.

Depress clutch pedal and stop tractor motion before shifting range shift lever or changing direction.

Never rest a foot on the clutch pedal while tractor is traveling.

It also covers the free travel specs of the clutch:

Checking and Adjusting Clutch
Checking Clutch Adjustment

MX4162

1. Pull down on clutch pedal and measure the free travel distance (A) that the pedal pivots from top of stroke to the point before clutch engagement occurs.

2. Adjust clutch if free travel is greater than 25 mm (1 in.).

If not it needs to be adjusted to between 5/8" & 1".

A certain amount of grinding here and there occasionally is to be expected but the description you give leaves me wondering. Every gear shift tractor I have owned was like this. My Kubota L245would grind due to a hanging clutch which neccessitated my starting it in gear with the clutch in and never letting the clutch out in neutral if possible. My Cub 154 Loboy would grind just a little if you tried to shift too fast after depressing the clutch from neutral. (just had to clutch and wait for the gear train to come to a stop by watching the clutch assy. & then shift)

Hope I have not confused the issue more. Best bet is to discuss this with your dealer first to go over all the possible reasons and go from there. Good luck on reaching an answer and solution. Let us know what was the problem. Nice tractor by the way and welcome to the board!






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 10-09-2003, 23:33 Post: 65920
DRankin



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 Shifting a new JD 990

Don't take this wrong.... I had a 4100 Gear for 2+ years.... But maybe you could change your driving technique?

On an HST you need to use the hand throttle to keep the RPM's up to get proper performance. On your Gear tractor you can just use the foot throttle like you would in a car or a truck.

That way when you shift, the tractor engine is at idle and you control your ground speed with rpm's and foot throttle pressure.

When I had the 4100 Gear, I only used the hand throttle when "roading" the tractor or as a cruise control pulling grader blades and sometimes to keep the rev's up (1500 rpm)doing loader work because I didn't have enough feet and hands to do everything.

95 percent of what I did with the tractor involved using only the foot throttle as you would in a car.






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 10-10-2003, 03:36 Post: 65923
harvey



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 Shifting a new JD 990

I am not quite certian why you would try to put tractor in gear at full rpm.

If you are mowing and want to make a direction change at full rpm, simply stop, clutch, cng gear and go. The transmission will do this, with out grinding. If you let out the clutch between gears you will start the transmission spinning and will have to wait for it to stop again.

Generally if you have and geared tractor, truck etc you have to let the transmission stop spinning before you can put in gear. The bigger, heaverier and faster it is spinning the longer it takes to stop spinning. Big trucks have clutch brakes to assist, little tractors do not.

Idle down if you have had tractor working at full rpm and had the tractor in neutral before you try to put in gear.






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 10-10-2003, 07:14 Post: 65929
TomG

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 Shifting a new JD 990

My TX ranges aren't synchronized. Sometimes I 'tickle the clutch' if it won't go into gear without grinding. Overall it does work better at lower engine rpm's, which is also true for 4wd and the pto. Clutch tickling works for them too.






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 10-10-2003, 10:09 Post: 65939
itsgottobegreen

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 Shifting a new JD 990

Talk to you dealer, it shouldn't do that. I use to run a JD 1070 w/loader and backhoe. It never did that. It did jump when you let the clutch out to fast, but thats probly because of the weight of the backhoe. If it that new, it probly has a factory defeat.






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 10-11-2003, 10:29 Post: 66025
Chief



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 Shifting a new JD 990

dlamay, any word yet from your dealer or have you got an update as to what the problem is? Am curious as to what the cause of the problem is.






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 10-11-2003, 19:21 Post: 66050
dlamay



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 Shifting a new JD 990

I would like to thank everyone for the personal experiences that they have had with shifting over the years. Through much reading and searching it looks like you should depress the clutch and wait 5 seconds to move the transmission from neutral to any gear. I have done this and I am still getting some gear grinding. A John Deere repair guy is going to swing by my house next week and see what he thinks the issue is, my guess is that the second portion of the clutch that disengages the transmission needs to be adjusted.

I will post a follow up and let everyone know what the resolution is to this issue.

Thanks again,
Dan






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 10-12-2003, 06:14 Post: 66065
TomG

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 Shifting a new JD 990

My experience with sliding gear TX's is that they can stop in a position where they just won't go into gear. Spinning the shafts a bit by engaging the clutch slightly will reposition things and allow shifting without grinding. But you likely know this since you owned N's and Green had a similar tractor so what's happening probably isn't normal.

I'm familiar with two stage dry clutches and the TX clutch disengages before the pto clutch and a dragging pto clutch shouldn't affect the TX unless it's out of alignment. I seem to recall that some JD's have wet clutches and there are release issues with some of them. It'll be good to hear what the JD tech says.






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 10-24-2003, 18:23 Post: 67025
johnbilt



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 Shifting a new JD 990

Hi

My JD990 will do the same thing. The dealer suggested reducing the rpm before shifting into gear. I have found that when I let the tranny rev to high rpm in neutral, that it will take a few seconds to spin down after pressing the clutch.

I usually run into this problem when I set the brake, tranny in neutral, rpm's up, to jump off the tractor for a moment to grab or move something. I have found that by pressing in the clutch when I first get back into the seat, then release the brake, will give enough time for the tranny to spin down and shift into gear smoothly.

I don't have any other problems shifting between gears.

John






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