Kubota B21 Temperature Gauge Reading

[dsilvia]

Hello, I have a Kubota B21 and my temp gauge just stopped working. It just lays there as it was not running. Can someone give me some ideas on what the issue may be.

 

[number two]

Wire has come unplugged from the sending unit on the engine?
Bad sending unit?
No power to the gauge circuit?-fuse?

Good Luck!

 

[dsilvia]

Thanks number two, I will check everything out

 

[rScotty]

Most of the older temperature gauges were actually a mechanical pressure gauge. What looks like a single wire inside of a coil spring cover is in fact a thin metal capillary tube carrying fluid pressure from a sender on the engine. Those gauges almost never go bad unless the capillary tube has been severly crimped - or cut and some sort or repair attempted.
There may also be an electrical connection on the gauge, but only for the gauge light bulb.

Or,.... it may be a fully electrically operated temperature gauge. If so, the easiest way to tell between the capillary pressure vs electrically operated type is that fully electric gauges do NOT have that peculiar coil spring wound cover protecting the metal capillary tube between engine and gauge.

Either guagetype will work, and being universal you can even replace yours with a similar gauge from an automotive store. However, be sure to get the type that has threaded adapters so that the sender that screws into the engine block will have the proper thread. A lot of gauges come with a little bag of those thread adapters.
Hope this helps,
rScotty

 

[dsilvia]

Most of the older temperature gauges were actually a mechanical pressure gauge. What looks like a single wire inside of a coil spring cover is in fact a thin metal capillary tube carrying fluid pressure from a sender on the engine. Those gauges almost never go bad unless the capillary tube has been severly crimped - or cut and some sort or repair attempted.
There may also be an electrical connection on the gauge, but only for the gauge light bulb.

Or,.... it may be a fully electrically operated temperature gauge. If so, the easiest way to tell between the capillary pressure vs electrically operated type is that fully electric gauges do NOT have that peculiar coil spring wound cover protecting the metal capillary tube between engine and gauge.

Either guagetype will work, and being universal you can even replace yours with a similar gauge from an automotive store. However, be sure to get the type that has threaded adapters so that the sender that screws into the engine block will have the proper thread. A lot of gauges come with a little bag of those thread adapters.
Hope this helps,
rScotty

Ok, now it appears that my fuel gauge is not working properly. It says there is approx 7/8th full, however I ran it for a while and have less then a half a tank, looked inside the tank. Could this be a fuse issue. If so, where do the fuses reside on the B-21. Thanks

 

[rScotty]

Ok, now it appears that my fuel gauge is not working properly. It says there is approx 7/8th full, however I ran it for a while and have less then a half a tank, looked inside the tank. Could this be a fuse issue. If so, where do the fuses reside on the B-21. Thanks

The diagrams I looked at don't show any fuses. Maybe someone else knows. When you start having to chase electrical issues, the first thing to do is trace clean up all the electrical connections you can find.
Especailly the ones behind the dash and around the ignition switch.

 

[number two]

The temperature sending unit could be checked with an ohmmeter.
See the WSM for details.
Perhaps it's giving incorrect readings to the gauge?
Good Luck!

 

[Dave M7040]

I have provided you with the 3 pages from the WSM explaining how the fuel and temp gauge work + wiring diagram for whole machine assuming it is equipped with OPC
Dave M7040