Go BottomMystery Pedal
 | FarmerWannabe
Join Date: Posts: 1 
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2001-06-14 29261
I have a 80's or 90's B7200 with 4WD. Their is a pedal, at a reverse angle, on the foot rest down in front of the 4wd and hi/lo levers. It is rather difficult to move up and down and does not spring back to either position. It appears to be connected to the rear transfer case. Can someone please tell me what this is for and what position the pedal should be in? I know, I should buy a manual but short term I want to make sure I am not doing any harm. Thanks again to all.
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada 
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2001-06-14 29263
I think you will find this is the Differential Lock pedal. As the name suggests, it causes the two rear wheels to lock together to maximize traction. It may be very stiff to engage or release if not used much, and should only be applied with the clutch engaged and do not try turning while it is engaged either. Best of luck. ....
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| FarmerWannabe
Join Date: Posts: 1
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2001-06-14 29265
Thanks Murf!
Can I assume that up is disengaged? ....
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| MarkS
Join Date: Posts: 1
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2001-06-14 29271
Yes, up is disengaged. (At least on every tractor I have ever operated) I've had toubles in the past with the Diff lock not wanting to dissengage on a Cub Cadet tractor I owned. Even after pulling the pudal up the diff would stay locked. I have found it necessary to either back up and turn, or drive forward and turn to get the darn thing to unlock. But as was stated be careful when driving forward because the tractor will tend to "push" the front wheels instead of turning. This is due to both rear wheels driving and neither one wanting to slip at a different speeds alowing the tractor to turn. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2001-06-15 29302
In addition to what Murf said about steering and clutch when engaging the diff lock, it also should be engaged only at low engine RPM's and gears. If one rear wheel is on a hard surface, you don’t want to lock the differential when one wheel is slipping at appreciable speed. If the diff lock is working and you're still stuck, you'll see both rear wheels and one front wheel spinning. ....
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| Roger L.
Join Date: Jun 1999 Posts: 0
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2001-06-15 29323
Farmer, I've seen a number of these diff locks get sticky. Most of them are a foot pedal with a cam or bevel that pushes on the end of a rod which runs into the transmission. I've been able to fix several of them by taking the foot lever off (so I could get to the rod) and then squirting some penetrating oil down the length of that rod. Easy enough to do and you may want to try it. The rod itself usually has an internal spring which should be causing the rod to push out against the foot pedal.....this keeps it from engaging accidentally and also holds the foot pedal up. ....
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