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psdfield

91 520H need trans temp sending unit

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psdfield

Hi, New to Red Square but bought my first Horse in 1974. I just bought a 91 520H, the trans temp sending unit is N.G. ( it has continuity through it all the time ). According to my parts list

  the part # is 113193, it is not available from Toro. I do not know thread size ( 1/8 NPT  ?? )  any help you can give me would be great.   Thanks  Paul

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gwest_ca

Not much on this. 1/8" pipe has an OD of .405" - slightly over 3/8"

Click on the picture

Garry

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cleat

There are 3 on ebay right now.

 

Search for wheel horse 520 sensor.

 

It is either 1/4 or 3/8 NPT (I think 1/4).

 

Cleat

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gwest_ca

1/4" pipe has an OD of .540" or almost 9/16"

3/8" pipe has an OD of .675" or almost 11/16"

 

Pipe threads require a sealer.

 

Garry

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Duff

Bringing this thread back to the top.....I've got a 1990 520H I bought last fall and am now getting around to cleaning up. Where on the hydro is the temp sensor located? The wire was disconnected when I bought the tractor and it looks like the terminal may have broken of the sensor. I've looked at the transmission, the IPL and the wiring diagram but can't figure out where the actual sensor is located. Help and thanks!

 

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gwest_ca

Perhaps this is it. Appears to be under the right axle below the dip stick.

 

The sending unit is shown on the electrical page but that does not help with location.

 

Garry

520-H trans TSU.png

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Creapy8x

Stirring up this topic again! I’ve had my 88 520h for a few years now and just recently after mowing my lawn for roughly an hour or so my hydro temp light will come on, never had this problem before and the only thing I’ve done recently to the tractor was a front axle swap! I did however do a fluid and filter change after the light came one this last time but I’m curious would that sensor on the transmission work with an after market temp gauge or no? 

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lynnmor
4 hours ago, Creapy8x said:

Stirring up this topic again! I’ve had my 88 520h for a few years now and just recently after mowing my lawn for roughly an hour or so my hydro temp light will come on, never had this problem before and the only thing I’ve done recently to the tractor was a front axle swap! I did however do a fluid and filter change after the light came one this last time but I’m curious would that sensor on the transmission work with an after market temp gauge or no? 

Did you remove the seat and fender so the transmission can be properly cleaned?  Is the fan in good condition and mounted tightly so it doesn't slip?

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Creapy8x

I did have the seat pan off to better access the filter for a fluid change and while it was off I did blow out all the excess debris that was built up but I did not thoroughly check the fan or belt tension!

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lynnmor
1 hour ago, Creapy8x said:

I did have the seat pan off to better access the filter for a fluid change and while it was off I did blow out all the excess debris that was built up but I did not thoroughly check the fan or belt tension!

After seeing one get real hot from a slipping fan I now know how important the cooling system is.  When I pull the fender off I go one step farther and remove the gas tank so all of the debris can be washed out using engine cleaner and a garden hose.

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