Super M Gears Grinding?

Smith1000 · May 27, 2008

What causes the gears to want to grind a bit when shifting? It has always done this, unless I idle very slow and move it into the next gear very, very slowly. Otherwise, I can start out in a higher gear. Kind of would like to fix it. Any ideas on what might be the solution?

Nebraska Kirk · May 27, 2008

(quoted from post at 18:47:25 05/27/08) What causes the gears to want to grind a bit when shifting? It has always done this, unless I idle very slow and move it into the next gear very, very slowly. Otherwise, I can start out in a higher gear. Kind of would like to fix it. Any ideas on what might be the solution?

You can't shift while moveing without the gears grinding somewhat. The transmission is a sliding gear trannsmission, when you move the shifter lever you are actually sliding a gear into mesh with another gear. The two gears have to be turning the same speed for them to mesh smoothly without grinding, this takes practise.

ScottyHOMeY · May 27, 2008

Basic idea is that if the tractor is idling in neutral with your foot off the clutch, the input shaft is turning. It has some momentum to it, so it won't stop turning immediately when you depress the clutch pedal. If you try to shift it into gear before it's stopped spinning, you'll get a little grinding. The gears are a straight cut so they'll be a little noisier as they mesh. Doesn't happen every time by any means, but being a straight cut, you'll also be more apt to find, if you wait and let the input shaft spin down to a stop, that they don't mesh as easily, as is in you might have to let up a little on the clutch to spin and crunch it into gear.

What's synchro-mesh?

Nature of the beast.

Smith1000 · May 28, 2008

Interesting....I can live with it the way it is as I am used to it. Would any type of gear lube improve the situation at all. Probably not, based on your description.

glennster · May 28, 2008

you can try running a heavier gear lube, that may slow down or stop the gears from coasting while trying to shift. typically 80-90 wt is what most people run, there is a 140 wt (may be an 85-140wt)farm and fleet has it.

Andrew Kappers · May 28, 2008

The problem is speed shifting. If you shift while the tractor is still moving, the gears will usually grind. Usually this is only shifting up. Going from 3 to 2 for example. When you shift down 4 to 5, they usually slip together pretty easily. Many farmers speed shifted over the years and ended up having transmission problems. Gears arent cheap and involve quite a little work to replace. If you arent in a hurry, the time it takes to let the tractor stop and shift could save you some money down the road.

495man · May 29, 2008

1) Don't put shifter into gear immediately after pushing clutch in, wait a moment
2) do not shift tractor while in motion when possible, i.e. before moving shifter from gear, come to stop, hold clutch in (brake if required on slope) then move shifter.
3) If shifting for roadwork, exercise proper double clutch techniques and understand the required revs and travel speeds for gears to line up. Grindless shifts are possible if you know what you are doing.

Super M Gears Grinding?

Smith1000

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Nebraska Kirk

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ScottyHOMeY

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Smith1000

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glennster

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Andrew Kappers

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495man

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