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Have you checked the safety switches that could prevent the engine from starting.

[b]Seat Switch and Reverse Seat Switch[/b]
These switches are located under the seat. When
sitting on the seat, the seat switch (1) is pushed in and
electrical circuit is closed. When the seat is vacant, this
switch is not pushed and electric circuit is opened.
Other reverse seat switch (2) is to detect tilting the seat.
When tilting the seat forward as shown in the figure, the
reverse seat switch (2) is pushed in and electrical circuit
is closed.

[b]Main Gear Switch 1 and Main Gear Switch 2[/b]
These switches are located on the transmission case
upper cover. When the main speed change lever is not
in neutral, these switches are pushed in and electrical
circuits are opened

[b]Rear PTO Switch[/b]
This switch is under the PTO gear shift lever. When
the PTO gear shift lever is in neutral, this switch is
pushed in and electric circuit is closed.

[b]Clutch Pedal Switch[/b]
This switch detects the clutch pedal whether being
depressed. When the clutch pedal is depressed and the
clutch disengaged, this switch is pushed in and electric
circuit is closed

[b]Starter Relay and Key Stop Timer[/b]
Starter relay and key stop timer are located at inside
of the fuel tank frame

Engine Starting Conditions
When the following conditions become complete, output current (12V) reaches coil terminal of the starter relay from
main switch AC terminal, and the engine can be started.

Clutch Pedal Switch Depressed
Rear PTO Switch: disengaged
Main Gear Switch 2: Transmission in neutral.

You can test the switches by replacing them, temporarily, with an automotive fuse. If the engine starts then the switch is likely bad. You should also check for continuity at the switch plugs.

Kubota B7510 will not start
Kubota Tractors
Replies 3 Post by eborduas

[QUOTE=hardwood;173216]The builders of any brand tractor, Deere, Kubota, or any brand want their tractors to perform the best they are capable of and last a long time without breakdowns, that's called building customer base. [/QUOTE]

Same is true for Ford, GM, Toyota, etc. and it's be shown over may decades that using consumables other than those sold by the manufacturer has no impact on the longevity of the engine, assuming recommended grade of oil is used.

Looking at the Operator's Manual for my B7510, the Lubricants table calls for API Service Classification of CD, CE or CF and various weights and viscosity using SAE specifications. What is missing from the table is any reference to Kubota branded oil. Instead they refer to industry specification such and API and SAE and as such any oil that meets the stated specifications is approved by Kubota for use in Kubota engines.

The only Kubota branded consumable referenced is Kubota Super UDT fluid for use in the transmission case and the front axle, but the manual indicates that SAE 80 or SAE 90 gear oil can be use for the front axle case in place of the Kubota consumable.

Knowing that Kubota sanctions the use of non-Kubota branded consumables means that you don't need to drive to the dealership, which can be many miles away. For me the closest Kubota dealer is 40 miles away. So, to get the needed oil is an 80 mile drive round trip and ~90 minutes. If my car/truck gets 20 mpg then Kubota branded oil is costing you, assuming $4 per gallon, $16 in gas. One gallon of Shell Rotella T oil, which matches the Kubota recommendation, is on sale at Autozone for $17.99 and lucky for me their is an Autozone much closer to me, and I suspect that for many of you an auto parts store closer than the dealer.

From the Kubota FAQ, http://www.kubotaengine.com/support/faq.html

Q: I can't find diesel-rated 10W30. Can I use 15W40?
A: Yes, many of our customers use 15W40 engine oil in their Kubota diesels. Just make sure whatever oil you use has an API rating of CF or higher.

Q: Can I use synthetic oil in my Kubota engine?
A: Kubota recommends oil with an API rating of CF or higher. If the synthetic oil meets those standards, it can be used in Kubota engines.

Kubota B7510 Oil Change
Kubota Tractors
Replies 18 Post by eborduas