Back in March my Jd 4400 hydrostat old style axle with 175 hours on the clock went to the shop:
1.Differental lock failure.
2.Tractor would not start.
3.Hydraulic oil leaking from top of rear end under seat.
4.Starter was not engaging all of the time.
Well here is what the dealer repaired:
1.Replacement of the differental lock.
2.Replace the hydrostat transmission pump(metal shavings from the diff. lock had damaged pump).
3.Replaced fuel pump.
4.Replaced starter.
5.Fixed leak.
Still experincing problem:
1.At times still won't start(have to take lines off of fuel pump etc and reassemble) then it will start.
Tires:I am not sure what is meant about your question of Q-1 and Q-2(I do not know what that would be without researching it myself)
The R-4 tires do not offer the traction I need here on my farm in West Virgina,I have a lot of steep hills I have to get over these R-4 are fair weather tires,although I like the width for stability but that is as far as it goes.
I am going to have to purchase the R-1 tires and rims,I suffered through last winter,I am not going to again. I suppose I will have a set of R-4 rims and tires leaning against the wall in my barn unless I could sell them later on,then to make things worse I bought 3 wheelweights for each back tire and these wheelweights will not fit on the R-1 rims.I do not know if I will be able to trade those to my dealer for R-1 weights or not.
If you desire to ever put tire chains on the rear tires of your JD4400,I do not see how,you cannot hardly get a sheet of paper between the fender and the tire.I suppose this is a styling issue?The Kubotas have all kinds of room between the tires and fenders.
The John Deere dealership I have been dealing with are 1st class all the way.John Deere is good (in my opinion) about service and parts supply,but they should be you are paying a premium for everything.
Be careful if you buy implements they are very exspensive,I have the 513 rotary cutter and it is a lightweight implement if I ever seen one,I could have bought a King Kutter or an other brand for a lot less money and had a lot more metal in it. Next time I will and paint it green and put some John Deere decals on it for looks.Green paint is cheaper in a can than if you buy the implement with it already applied.
I have 11 months left on my JD4400 warranty,I will be watching the tractor real close. I follow the operators manual and use nothing but John Deere oils and grease and filters.The tractor is a dream to drive and operate,it has a very comfortable operators station etc.
I have bought several extras,a nice canopy, lights ...........
Anyway if you want know anything else,I will try to accomodate you or anyone else.