OK....I admit it....I grind my gears.

[foggy1111]

When operating my 790....particularly during heavy loader use.....I get too impatient and end up grinding the gears allot. Its hard to slow down and take the extra second or two to minimize the grinding.

My question: Have any of you 790 (or other gear shift guys) ever damaged your tranny from this treatment? (Maybe I need a horror story to slow down my grind.)

I operate less than 100 hours a year. While my tractor is probably just fine for my needs.....there are times when I long for a hydrostatic tranny.....especially during loader work. (Those 3032e's look pretty enticing at times.) Grinding those gears grinds is hard on my disposition.

 

[spruce Deere]

I too am wondering..... 'spose to be completely stopped for gear shift I read somewhere.... yea, easier said then done Loader work or just going for a higher gear its inevitable....

I have not encountered problems yet with my 790. When I changed the hyd./trans oil after break-in, I d@mn near fainted.... lots of "silver". The deere dealership shop assured me its like that with every 790 and 990 after first change.

So, then I popped the question to them, anybody ever grind up a tranny.... The shop foreman said not that he can remember, had a few clutches burnt due to improper use and one froze to the fly wheel from not depressing the clutch and locking it down when not being for a long period of time, how long he did not say.

The manager of the dealer also told me "there called bullet proof for good reasons" Typical salesman answer I thought!

 

[Trails2004]

Phew

I'm a newbie and have done it "once or twice" at least I'm in good company

I was afraid to admit that my name is "Brad and I'm a grinder"

 

[TomWhite]

It happens to everyone, at some time. I've done it. What I have found is that if I take down my RPM's a bit, the shifting seems to go easier. This is not only true of my 3005, but also a Ford 8N I had, and a New Holland TC30 I had.

 

[radman1]

In general, grinding is not good. It is metal gears slipping over metal gears. Can't be good. However, done occasionally, low hours and not too forcefully, probably no significant harm. Did my share gear grinding on older tractors without synchronized transmissions. You can grind and shift often enough to cause problems. Some tractors will pop out of gear due to excessive wear on gears due to bad shifts and hard use. Only way to fix is tearing down the transmission and replacing gear. Had to do this to our allis-chalmers D15. Initially would pop out of 3rd going downhill. Later had to use my knee to keep it in gear all the time. 3rd gear gets used a lot and it was a loader tractor.

It is possible to break a tooth on a gear from grinding but have never had that happen.

Not good to grind the gears on your car/truck. Not good to grind them on a tractor.

 

[Ezlivn]

Awwwww Hello (taps on mic) My name is John...and I am a GRINDER!!

 

[RoyJackson]

Well, you knowingly bought a non-sychronized transmission.
Gear grinding happens to all of us now and then, but not every shift. You just need to be patient.
It'll help if you use 1st or 2nd (Low or High Range) along with reverse. The shifts are then a straighter movement. I can shift while the tractor is moving, but slowly. Also, clutch early (before the shift) and use the tractor's momentum. Clutching early will allow more time for the gears to slow. How early? Well, that'll take some practice. And, unless you're using the PTO, depress the clutch fully down. Keep your throttle set about 1200 RPM and use the foot throttle...let off the foot throttle before shifting (just like in a manual transmission in a car or truck).

 

[AKfish]

It'll help if you use 1st or 2nd (Low or High Range) along with reverse. The shifts are then a straighter movement. I can shift while the tractor is moving, but slowly. Also, clutch early (before the shift) and use the tractor's momentum. Clutching early will allow more time for the gears to slow. How early? Well, that'll take some practice. And, unless you're using the PTO, depress the clutch fully down. Keep your throttle set about 1200 RPM and use the foot throttle...let off the foot throttle before shifting (just like in a manual transmission in a car or truck).

However, done occasionally, low hours and not too forcefully, probably no significant harm. Some tractors will pop out of gear due to excessive wear on gears due to bad shifts and hard use. Only way to fix is tearing down the transmission and replacing gear. Had to do this to our allis-chalmers D15. Initially would pop out of 3rd going downhill. Later had to use my knee to keep it in gear all the time. 3rd gear gets used a lot and it was a loader tractor.

It is possible to break a tooth on a gear from grinding but have never had that happen.

Not good to grind the gears on your car/truck. Not good to grind them on a tractor.

Yup... What they said..!!

Hardly any of the older farm tractors I used to run had synchro transmissions. And more than one over the years - had a gear or two that would pop out. But, that's after several thousand hours and many different (read... hard use) operators. With out a doubt, though - that's what grinding will get you over time.

Like Roy, I used to leave the throttle set a few hundred over idle - ~1200-1400rpm. Let off the foot throttle and flip the tranny into neutral; letting the clutch out and coasting a bit just before re-engaging the clutch to change gears or direction.

Much of the time, the operation was a double-clutch motion. Clutch in - nuetral. Clutch in - shift. Of course, the pause in shifting resulted in the tractor slowing down or coasting before the gear change.

Didn't always eliminate the grind but it darn near always made things smoother - IMO.

AKfish

 

[YesDeere]

My snow removal went like this: Foot throttle, let off, hard brake,clutch, soon as rpms low enough jam it. Kinda got in a rythym. But yes I Grind some times. Does make we wince when I do it. Poor little gears. With the 790 trans the only time shifting while moving is definetly a timing thing. Say going from 2 to 4. Just imagine the engine and trans going the same speed. IE stick it in when it sounds right

 

[JDGreenGrass]

I would say my experience has been that on the first try it always barks at me. Then, I give it a second or 2 and it goes into gear just fine.

So, yes, I'm grinding as well.