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 | EricBX1500
Join Date: Jul 2005 Posts: 46 mich 
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2005-10-09 117603
had to use it when digging my garden out. When one wheel would spin I stopped and would engage it then carry on. But somtimes I forgot to let off the lever to disengage it and would make a turn on my lawn. The inside wheel would rip the lawn up. A newbe mistake. I dont think this hurt the tractor because I was on the lawn I'm sure if I made this mistake on cement this would be a different story
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York 
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2005-10-09 117604
Sometimes under the right conditions they will not release until the pressure goes down or is released. ....
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 | jegenrieder
Join Date: Jun 2005 Posts: 18 Hampshire Co., WV / Arlington, VA
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2005-10-09 117633
It's very much like driving with a locker on a 4x4. Without an operating differential, it will throw you to the oustisde of a turn. That will certainly dig up your lawn. I noticed the same this afternoon while lifting and moving a log - trying to pivot the log, which was on my right, I actually noticed that I was pulling it to the left while I had the diff lock engaged.
Also, on many subcompacts, the axles are spinning at very differnet RPMs, so locking them together will make the front wheels spin faster, doing even more damage. Thi was common in some old japanese 4x4s, and caused significant axle wrap (the leaves of the suspension would warp into an S shape).
Don't use it on the lawn! ....
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| EricBX1500
Join Date: Jul 2005 Posts: 46 mich
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2005-10-10 117657
Let me see if I have this straight. When you make a turn without the traction lock engaged you’re inside wheel turns slower then you’re outside wheel right? But when you have your traction lock engaged you’re inside wheel turns at the same speed as you’re outside wheel. If this is true this would explain why my inside wheel was tearing up the grass as the wheel is spinning at the same speed as the outside wheel?? ....
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 | DennisCTB
Join Date: Nov 1998 Posts: 2707 NorthWest NJ
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2005-10-10 117659
Traction lock is only supposed to be used when you are going straight never in a turn because it locks the differential and does not allow the wheels to rotate at different rates as a normal differnetial does.
Trying to turn with diff lock on can do damage to the tractor and will definitely rip up your lawn.
If you were in 4WD that alone will rip up your lawn in a turn, so it is possible your diff lock was in fact released. The diff lock pedal on my B7610 is a press and hold to engage let go to release design, I assume yours is the same.
Dennis
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| EricBX1500
Join Date: Jul 2005 Posts: 46 mich
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2005-10-10 117661
The problem I had is when I engaged it then made a turn out of the dirt onto the lawn it did not disengage right away(the pedal did not pop out). Then I went backwards and it disengaged right away. ....
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| DennisCTB
Join Date: Nov 1998 Posts: 2707 NorthWest NJ
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2005-10-10 117663
So can you now engage it going straight and release it going straight? ....
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| maximum729
Join Date: Oct 2005 Posts: 2 central minnesota
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2005-10-10 117664
As you may have heard, this problem of tearing up the grass in fairly common among many sub-compact tractors. Just as if you try to turn a tight corner with a 4 wheeler with a straight axle, your grass shows your mistake, I used my neighbors JD 2210 with a loader hauling rocks, it also likes to eat the grass. ....
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| EricBX1500
Join Date: Jul 2005 Posts: 46 mich
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2005-10-10 117666
Yes Dennis. ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2005-10-11 117740
"Also, on many subcompacts, the axles are spinning at very differnet RPMs, so locking them together will make the front wheels spin faster, doing even more damage."
The above statement is not correct.
The 'traction lock' ONLY locks the rear axle solid, it does NOT lock the front axle solid, nor does it change the gear ratio between the front and rear axles.
Best of luck.
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| Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2005-10-11 117763
Kubota starts front wheel difflock at the 6800 size and then goes larger. Their system is a mechanical system on that size and then many are hydro electric activation in larger tractors. ....
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| EricBX1500
Join Date: Jul 2005 Posts: 46 mich
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2005-10-12 117770
So if one wheel is spinning you stop the tractor and engage the diff lock pedal give it a little gas and both wheels will engage, right? when I press it down and give it gas I can feel the pedal drop a little further. I guess this is the pin engaging?? Just as a test I was on solid ground going straight and stopped the tractor pressed the diff lock pedal down gave it a little gas and could not get it to lock(pedal would not drop further). I assume that the pin won't line up since both wheels are turning together. I'm just trying to get a better understanding on how this system works. This is all new to me.
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| Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2005-10-12 117772
Eric, you are on the right track.
When the differential lock is engaged, it takes the "Differential" out of the equation and turns the rear end into a "Detroit Locker", both wheels will turn, period.
The motion you felt ("I can feel the pedal drop a little further.") was exactly that, the diff. lock engaging.
There are many reasons why the diff. lock wouldn't engage on "solid ground", but with both wheels on solid ground and getting good traction it would be difficult to get the mechanism to line up and allow engagement.
Basically all the diff. lock system is designed to do is give you a little extra traction in a sticky spot. Bear in mind this system was developed LONG before the proliferation of 4WD tractors. Getting a wheel stuck in a patch of gumbo on a 2WD tractor would often mean a loooong walk back to the barn for help, if there was a second machine even available to help you out.
Best of luck. ....
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| CurtisW
Join Date: Posts: 1
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2005-10-12 117781
Murf, Are you sure?
Aren't the ratios betwen the axles already different?
And why doesn't the traction lock affect both axles?
CW ....
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| Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2005-10-12 117790
CW, I'm quite sure.
Yes the axle ratios are VERY different, but so are the rolling circumferences of the front and rear tires. The difference between axle ratios and tire sizes however negate all but about 5% of the difference, this is called "lead". This is done on purpose for reasons of handling, if it was not there the front wheels would want to wander side to side when the tractor was in 4WD.
The traction lock only acts on the rear axle on most (especially smaller) tractors, on some big units it does act on both axles.
Locking the front axle on a small (read: homeowner sized) would also likely lead to all sorts of complaints and warranty claims from people who locked the front end then made a sharp turn.
The only real reason for having it on some and not all is cost. This is sort of like cab & A/C, on a big tractor it's pretty common, on a CUT it's pretty spendy.
Best of luck. ....
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| Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2005-10-12 117809
Good call on the lead ratio Murf! ....
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| BrendonN
Join Date: May 2004 Posts: 89 Central Kansas
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2005-10-13 117818
One situation where a locking differential is really handy is when crossing a ditch at an angle. If the front axle pivot bottoms out you can end up with one front and the opposite side rear tire unloaded and spinning freely, even in 4WD. Lock the diff and you will crawl right through.
Another handy use on field tractors is the straight driving tendency that the locked diff provides. Most large farm tractors now have an automatic setting that keeps the lock engaged all the time but will release it when a single brake is applied during turns. It will then unlock for the turn and relock when the brake is released (using a hydraulic clutch pack, not a mechanical pin or pawl like our CUTs). Keeping the implement in line and making straight passes becomes a lot easier as the tractor almost guides itself. ....
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| EricBX1500
Join Date: Jul 2005 Posts: 46 mich
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2005-10-13 117827
thanks for the input. It all makes sence. I have one other question. Is one of the axles always locked. Looking in the parts diagram I have it looks like there is a collar that the diff pedal operates to lock only one axle?? ....
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 | jarndt
Join Date: Dec 2003 Posts: 351 Northern Virginia
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2005-10-13 117842
There is a differential in both the front and rear axle. Only the REAR axle has a diff lock. When the diff lock pedal is pressed, the two rear wheels will lock and turn at the same speed no matter what. When it is released the rear wheels will turn at different speeds in a turn or in low traction conditions. The front axle is unaffected by the rear diff lock, whether in 2WD or 4WD. It only reacts to traction conditions under each tire.
There is NO differential BETWEEN the front and rear axles (i.e. in the transmission). That is why your grass gets torn up in 4WD even when you are not using the diff lock. Not only do the inside and outside wheels want to spin at different speeds while in a turn, but so do the front and rear axles. Basically, all four wheels move in different arcs during a turning manuver. In 4WD with no 'center' diff, the front and rear axles are driven at the same speed by the transmission (or transfer case in a road vehicle). Since the the axles (think drive shafts) want to turn at different speeds just as the inside and outside wheels do, but are being forced to turn at the same speed, something has to give. The result is the wheel with the least traction spins faster than its own ground speed.
BTW, that is the main difference between part-time and full-time four wheel drive on most road vehicles. Part-time 4WD vehicles do not have a center diff in the transfer case, full-time 4WD vehicles do. Part-time 4WD with diff locks in both axles is the only way to get true 4WD. ....
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| Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2005-10-13 117843
"Part-time 4WD with diff locks in both axles is the only way to get true 4WD."
Reallllly, wanna take a ride in my Land Rover ?????
....
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