Go BottomKubota G1900 does not start
 | steve m
Join Date: Posts: 1 
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2004-03-24 81034
My Kubota G1900 wont start sometimes. Not a dead battery but no response when the key goes from warming the glow plugs to actually starting. Its like the brake isn't depressed. The dash lights are on but no response. If I work the transmission pedal, and the brake, and move on the seat sometimes it will start. I've towed it 25 or so feet then it would start. I'm trying to figure out which "safety switch" is defective. any one have any similar problems? The problem has been getting worse over the past few years. thanks in advance Steve
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| bob
Join Date: Posts: 1
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2004-04-01 81815
Make sure the brake is set and PTO is not engaged ....
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York 
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2004-04-01 81829
Do not tow that tractor and think it will start as you might have to open the wallet deep for a new hydro. Do start eliminating safety switches till you find out which one it is. This is not uncommon on tractors and you are not the first by any means to have this problem. ....
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| terryh
Join Date: Apr 2005 Posts: 1 louisiana
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2005-04-08 109601
I am having an intermittent starting problem with my Kubota g1900.I call myself checking all safety switches,could it be the ignition switch. ....
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| Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2005-04-11 109709
IT could be the ignition switch but that could be tested to. ....
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| joseph31
Join Date: Mar 2011 Posts: 3 Huntsville, AL
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2011-03-04 177169
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.
....
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| joseph31
Join Date: Mar 2011 Posts: 3 Huntsville, AL
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2011-03-04 177170
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.
....
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 | kthompson
Join Date: Oct 2005 Posts: 5275 South Carolina
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2011-03-04 177174
Joseph, glad to have you here and for jumping in. Do notice the post is a little old you were helping on but the info is still very good. Wish you has posted it a year or so ago. I pulled battery out of my bigger Kubota until about could do in it my sleep to finally get the positive post also clean as you mentioned. They do make a battery cable tool that will on most size post and ends cut it out with inserting the tool and rotating it. Do agree it was hard surface. ....
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