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Old 1 Week Ago   #1
Palominofarmer
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Join Date: Dec 2019
Location: VADO
Equipment: Kubota M7040
Posts: 3
Default M7040 No power to dash, no start

Ok guys, time to do that last thing men do...ask for help.

I have a 2011 M7040. A couple weeks ago the tractor would not start, had no power to dash. I charged up the battery, no help. Next day I walk out thinking I'm going to dig into this thing, starts right up like normal. Finished my chores, turned tractor off, wont start again. Ran a test light to the key switch and I'm showing power but when the key is turned to start the power doesn't transfer to any other wire. Has to be switch right? No. Ordered brand new switch from kubota, installed and the damn thing cranks right up. problem solved? Nope. I started it this morning with no problem, tried to start this evening and back to square one. All fuses look good and basically the damn thing starts whenever it wants. The light comes on with door open so I'm definitely getting power to the cab. I'm not sure where to go from here. Any help is appreciated. Thank you.
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Old 1 Week Ago   #2
Roadworthy
3rd Yr. Apprentice
 
Join Date: Aug 2019
Location: Benton City, WA
Equipment: L2501 HST
Posts: 287
Default Re: M7040 No power to dash, no start

Clean both battery terminals inside and out. Make sure the ground side of the battery has a good clean connection to the frame of the tractor. Start with the easy really basic stuff.
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Old 1 Week Ago   #3
Tx Jim

4th Yr. Apprentice
 
Join Date: Apr 2013
Location: Coyote,Flats,Texas
Equipment: M7040 HDC-1
Posts: 791
Default Re: M7040 No power to dash, no start

Welcome to OTT
Ditto what Roadworthy stated. Have you cleaned/tightened all four(4) battery cable connections?

Last edited by Tx Jim; 1 Week Ago at 03:31 AM.
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Old 1 Week Ago   #4
Dave_eng
Master Tech
 
Join Date: Oct 2012
Location: Williamstown Ontario Canada
Equipment: M7040, Nuffield 465
Posts: 2,127
Default Re: M7040 No power to dash, no start

I have attached the wiring diagram for the start circuit and the troubleshooting chart.

Start with Roadworthy's suggestion.

In the start circuit there is a 5 amp fuse, start relay, neutral safety switch on shuttle shift, pto safety relay, and lastly pto switch.

After cleaning the battery connections, my next step would be to jump the starter to make certain the most basic component is working.

If you do not know how to do the starter jumping safely please ask first.

Dave
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File Type: pdf forum M7040 start 2.pdf (13.7 KB, 3 views)
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Old 1 Week Ago   #5
leveraddict
1st Yr. Apprentice
 
Join Date: Apr 2019
Location: Madison,Pa.
Equipment: 2017 BX23S 60 Landpride box blade 54" belly mower 60" County line back blade
Posts: 51
Default Re: M7040 No power to dash, no start

I had a similar experience! The plug going to the starter that snaps together was still snapped together but had some back and forth play! Just enough to disconnect but still snapped together! Thats one sloppy plug on my BX! Lucky I found it just before the dealer was about to pick it up! I still had power to the dash though.
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Old 1 Week Ago   #6
Palominofarmer
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Join Date: Dec 2019
Location: VADO
Equipment: Kubota M7040
Posts: 3
Default Re: M7040 No power to dash, no start

Cleaned all battery terminals, checked all ground connections. All fuses look good, I even pulled out ever single one and cleaned all contact points. I had the issue with the PTO switch before but it didn't prevent power to the dash lights. Imagine turning the key as if the battery was completely dead but the battery is fine. The couple of rare times it decided to start it started very strong with no hesitation. It started yesterday but I didn't move the tractor at all, didn't change gears or even sit in the seat. I cranked it, let it run for a bit and shut it off. Later that evening there was no power again but I have the cab light come on.
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Old 1 Week Ago   #7
Dave_eng
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Join Date: Oct 2012
Location: Williamstown Ontario Canada
Equipment: M7040, Nuffield 465
Posts: 2,127
Default Re: M7040 No power to dash, no start

Quote:
Originally Posted by Palominofarmer View Post
Cleaned all battery terminals, checked all ground connections. All fuses look good, I even pulled out ever single one and cleaned all contact points. I had the issue with the PTO switch before but it didn't prevent power to the dash lights. Imagine turning the key as if the battery was completely dead but the battery is fine. The couple of rare times it decided to start it started very strong with no hesitation. It started yesterday but I didn't move the tractor at all, didn't change gears or even sit in the seat. I cranked it, let it run for a bit and shut it off. Later that evening there was no power again but I have the cab light come on.
A few questions so I can better understand.

When the tractor is unresponsive are you saying the only thing to work is the cab dome light? The upper front and back lights wont work? The headlights wont work? Radio wont work?

Is there power in the cigarette lighten socket?

Dave
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Old 1 Week Ago   #8
AllDodge
2nd Yr. Apprentice
 
Join Date: Jan 2019
Location: South Central, ky
Equipment: M9540 RTV1100
Posts: 161
Default Re: M7040 No power to dash, no start

You need a voltmeter, a test light will light at lower voltages

So with key ON, there is no radio and windshield motor does not turn ON?
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Old 1 Week Ago   #9
Palominofarmer
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Default Re: M7040 No power to dash, no start

Quote:
Originally Posted by Dave_eng View Post
A few questions so I can better understand.

When the tractor is unresponsive are you saying the only thing to work is the cab dome light? The upper front and back lights wont work? The headlights wont work? Radio wont work?

Is there power in the cigarette lighten socket?

Dave
Power to dome light. No power to cig, radio, A/C, Dash lights, work lights front or rear, wipers, headlights, guages.

This morning I went to start it, started fine, no issues at all. Didn't move it at all or mess with anything at all. Just start, ran for a few, turned it off. Took my daughter to doc. Appt., went to start it and nothing again. When it starts, it starts without issue. When it wont start I get absolutely nothing when I turn the key. It's about as random as it gets.
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Old 1 Week Ago   #10
AllDodge
2nd Yr. Apprentice
 
Join Date: Jan 2019
Location: South Central, ky
Equipment: M9540 RTV1100
Posts: 161
Default Re: M7040 No power to dash, no start

Quote:
Originally Posted by Palominofarmer View Post
Power to dome light. No power to cig, radio, A/C, Dash lights, work lights front or rear, wipers, headlights, guages.

This morning I went to start it, started fine, no issues at all. Didn't move it at all or mess with anything at all. Just start, ran for a few, turned it off. Took my daughter to doc. Appt., went to start it and nothing again. When it starts, it starts without issue. When it wont start I get absolutely nothing when I turn the key. It's about as random as it gets.
Its wire or connection from Starter to Fuse to Key. Something in the chain has some corrosion or bad connection, my guess is corrosion.
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