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I encountered a hard starting problem on a G1900 that I was fixing up. The guy sold it because he was having electrical problems with it. The battery was charged and tested good using a battery impedance analyzer. Upon further testing, a voltage drop was observed between the positive battery post and the battery cable terminal. Close examination revealed a black oxide-like coating on the inside of the battery cable terminal instead of a silvery like surface . This black oxide-like coating was very hard and was not conductive (high resistance). I thought that I had forgot to wire brush the terminal and wire brushed it. The wire brush did NOT remove the black oxide-like coating. After experimenting with several different battery terminal brushes, with no result, I used a �rat tail file.� With this I obtained the silvery surface and it that also tested a low resistance. The negative battery cable terminal was OK, with a silvery surface. The tractor started robustly!
Then I remembered that my other Kubota, a G1800, that I had personally used on my resident, for the last 12 years, had been developing a hard starting problem. The battery was about 9 years old, so I had purchased a new battery but had not installed it. So I checked the battery cables terminals on the G1800, and the same problem had occurred, and again ONLY on the positive cable terminal. I then checked a 45 year Chevrolet that had lead battery cable terminals. The cables were OK. So this is probably not a lead oxide type problem.
The conclusion is that Kubota might be using an alloy of lead for its battery cable terminal that forms some kind of a very hard oxide, possibly only on the positive terminal. Use a �rat tail file� (round file) and carefully remove only the surface oxide, such as to not remove a lot of the terminal material.
I don�t know if this will solve your problem, but in a sample of two Kubota�s, the problem occurred at a rate of 100% . It is worth checking because a low or intermittent voltage can cause strange problems.

Kubota G1900 does not start
Kubota Tractors
Replies 8 Post by joseph31