Go BottomB7800 4WD operation
 | dmnsmith2
Join Date: Jul 2003 Posts: 25 North AL 
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2003-06-05 56678
How does the 4WD work on this tractor? When should it be used? Ok if all the time or just when needed? Thanks!
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 | plots1
Join Date: Jul 2003 Posts: 563 mo 
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2003-06-05 56680
I rarly take my 790 out of 4x4 it aids in braking and traction, surely it doesn't hurt or it wouldn't be an option. ....
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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada 
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2003-06-05 56682
The only place two worry about 4wd and drivetrain wear is on hard paved surfaces such as asphalt or concrete.
Just be aware that you may need a lot more room to stop using two wheel drive.
It is a good idea to do a little experiment where you drive at transport speed in 2wd and hit the brakes hard and then do the same in 4wd to note the difference. ....
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 | ScooterMagee
Join Date: Jul 2003 Posts: 201 Nebraska
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2003-06-05 56683
To broaden the scope of this question, are there certain tractors that can be run in 4WD all the time. While, others should use 4WD only on an “as needed basis”? ....
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| DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2003-06-05 56690
I suspect that most, if not all 4wd tractors need to be taken out of 4wd occasionally.
If I am running a heavy load downhill on a paved surface I will keep it in 4wd so that I will have the best possible braking.
If am maneuvering around the driveway to get lined up with a 3 point implement I will almost always do that in 2wd because it steers and turns easier in tight quarters in 2wd.
I think you have to be constantly aware of the ground conditions and your load, but I must admit when my wife is running the tractor I try to keep it simple and I tell her to just keep it in 4wd all the time.
That is probably the best default position. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2003-06-06 56754
Most front axles are geared so the front tires turn slightly more than the rears (called axle lead). That means the front tires do have to slip a bit. It's harder for them to slip on high traction surfaces or with heavy front loads. It's a bit harder on the front drive to operate in 4wd on high traction surfaces but certainly not enough harder to avoid using 4wd when extra braking or stability is needed.
I think it would be good to avoid steering when operating in 4wd on hard surfaces. The front and rear tires do travel different radii in turns--same as left and right. In effect, a turn would increase an axle's lead somewhat. I've heard that some 4wd heavy equipment have differentials in the front drive line to eliminate the problem. It also would keep one front wheel driving rather than skidding in a turn.
I stay in 2wd when driving on the lawn whenever possible since it tears the turf less. I also stay in 2wd when doing heavy loader work if I don't need the traction to go into a pile of loose material and I'm not negotiating hills.
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2003-06-06 56774
I don't recommend to run in four wheel drive any more than needed. In the past some manufacturers ran up to a seven percent lead. The standard we shoot for is two to three lead with a maximum of four percent. If you don't need it for the conditions you are in don't leave it engaged. It is your cost of fuel and tires wearing out prematurely. ....
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| bigbukhntr
Join Date: Jul 2003 Posts: 56 flower mound, texas
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2003-06-06 56779
my sentiments exactly art.....why put the excess wear and tear on parts when its not necessary.
i mainly use my 4 wd on slopes or hills when i need the extra traction, i disengage it when doing normal mowing / blading / spreading. ....
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| DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2003-06-06 56787
I must remember to temper my comments with the facts of where I live and the character of my land.
Many folks could get by with a 2wd CUT if it was heavy enough. I could not. Without 4wd, carefully selected tires and lots of ballast I have trouble running any tractor on my sandy, steep lot.
The other day I was driving my JD 4100 down a slope right next to the house in 2wd in a low gear using engine compression to control the speed.
I was feeling pretty smug because I felt I had finally found the right combination of rubber and ballast that would let me operate in 2wd about half the time instead of 4wd all the time.
Wouldn't you know it? Just when you think you got all your poop in one sock the tractor bites you.
Halfway down the slope the right rear tire rolled up on a smooth round rock about the size of a grapefruit. The problem was that it didn't roll over the rock instead it started pushing it ahead of the tire like a big ball bearing.
The other three tires, having no real mechanical connection to the engine, began to free-wheel and the tractor took off down the slope.
About eight feet later the tire finally got over the rock, which lifted the rear end up and slammed it back down, and re-engaged the drivetrain/engine compression which slammed me forward in the seat.
I came within inches of crunching the whole thing into the house and my neck and back hurt for two days.
I guess I am back to using 4wd for the majority of my operations, and that is why I tell my better third (calculated by weight)that she should just leave the 4wd engaged all the time. ....
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| Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2003-06-09 57176
Mark, it sounds like you had a exciting ride and didn't have to go to an amusement park for it! One of the things of being here and trying to help people that makes it hard is the fact I can't see the property! Not everyones property is the same nor are the conditions or applications. There is always going to be conditions that need true four wheel drive for safety. ....
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