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Kubota m4900 won't start unless i jump starter. replaced…

Customer Question
Kubota m4900 won't start...

Kubota m4900 won't start unless i jump starter. replaced neutral safety, and PTO safety sw. next item will be the ign sw any ideas. took starter off and had it tested. Good

Mechanic's Assistant: What is the complete model and serial number of your machine?

M4900 serial# *****

Mechanic's Assistant: Are you fixing this yourself? What have you tried so far?

Yes. replaced neutral safety sw pto safety and just ordered ignition. took off starter and had it benched tested- good

Submitted: 5 years ago.Category: Construction and Road Equipment
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Answered in 5 minutes by:
6/5/2017
Mechanic: Curtis B., Technician replied 5 years ago
Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 43,580
Experience: Technican turned service manager with multiple lines of equipment and rental units.
Verified

Hello! Let's see if we can work together and come to a satisfactory conclusion!

have you tested he wire from the keyswitch start terminal to see if it has voltage for start? If it does, the wire between switch and starter solenoid may be bad.?? Do glow plugs show to work?

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Customer reply replied 5 years ago
Glow plugs good. key to start terminal no but there is a solid state starter solenoid behind the control panel that i too about and apart and nothing seemed or smelled burnt / discoloredcan't call I'm at work
Mechanic: Curtis B., Technician replied 5 years ago

Are you working with voltmeter or working blind?

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Customer reply replied 5 years ago
both
Mechanic: Curtis B., Technician replied 5 years ago

If you jump the solenoid behind the panel, will engine crank?

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Customer reply replied 5 years ago
haven't done that. not sure which wires to jump. I'm a retired AF plane mechanic going off mechanical knowledge
Mechanic: Curtis B., Technician replied 5 years ago

Positive battery terminal , to the switch terminal, should engage starter.

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Customer reply replied 5 years ago
thats how i start now. there is a solid state starter solenoid (relay) behind the control panel thats my next Tshooting area
Mechanic: Curtis B., Technician replied 5 years ago

Key switch has to close relay, then relay powers starter solenoid. The relay has a schematic on it ??

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Customer reply replied 5 years ago
no black plastic cover thats removable; looked in it all seemed to be good from a visual
Mechanic: Curtis B., Technician replied 5 years ago

Usually the relay cover has schematic of relay it.

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Curtis B.
Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 43,580
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Experience: Technican turned service manager with multiple lines of equipment and rental units.

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