Go BottomWill not stay in 4 wheel drive has turf tires
 | Tim Bartlett
Join Date: Posts: 1 
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2000-10-09 20466
My Ford 1720 with turf tires will not stay in 4wd it keeps slipping out the problem has come on slowly on occasion but now does it frequently when brush cutting wet fields.I know the factory tires are not matched properly size wise because when used in the snow you can see the front tires are kicking up because they are pulling more than the rears. Dealer told me to inflate rears to max PSI which is 15psi but it didn't help so I then lowered the front tire psi to 15 which seemed to help in conjunction with the rears at 15 but as I see it these tires should never have been put on this machine with the rolling circumference so unmatched. Is this a common problen, is there a tire solution, Bigger rears, or smaller fronts. Was this a warranty issue when new with a fix or was it just repaired only to happen again. I'm sure its not an issue with farm tires onlt turfs. Otherwise I love the tractor. Note: tractor has 920 easy hours on it and 4wd was used only when necessary.
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2000-10-10 20476
The owner's manual (now lost) for my 1710 gives standard ag and turf tire sets for the tractor. It also gives tire pressure/load tables. It is normal for front tires to have slightly more rolling circumference than the rears. For that reason, it's not good to operate in 4wd on hard surfaces--especially with heavy loads.
An owner's manual, or a dealer, should be able to identify the standard sets, and it should be an issue if a dealer installed a set that exceeded the recommended front/rear drive ratios.
In terms of tire pressures, if the front is pulling too much, then increasing the rear and reducing the front pressures will help. However, tire pressures sometimes need to be changed to meet different operating conditions--such as traction or load. If the tires are mismatched, juggling the tire pressures isn't a good permanent solution, because you might need to change the pressures for other reasons. Incidentally, the load/pressure for my front turf tires starts at 8#. Of course, you might not want to put much in a loader at those pressures. Max pressures are probably marked on the tires themselves.
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