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SMTA oddity

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DJL

09-16-2006 22:26:44

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Guys, I looked at a narrow front SMTA not too long ago. The tractor was not for sale, so I didn't pay too much attention to it. The tractor is now up for sale, so I wished I would've looked it over better (it's about 500 miles away). Here's the question: The tractor had some add-on Murphy switches on it, when I inquired about this, the owner told me they used to use it to power an irrigator pump. I believe he said they'd run it on LP when they did this. The tractor was a gas burner. Did the tractor come from the factory with the ability to burn gas or LP? If not, what other type of modifications would have had to be done to this tractor? Carb/manifold? Does this decrease the value of this tractor?
Thanks
DJL

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Brooks McCormick

09-18-2006 07:28:49

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Re: SMTA oddity in reply to DJL, 09-16-2006 22:26:44

What are the letter codes after the serial number?
If factory LP it will have a C in the letter codes.

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Wardner

09-17-2006 00:37:04

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Re: SMTA oddity in reply to DJL, 09-16-2006 22:26:44

I wouldn't be surprised if a solinoid gas valve was plumbed into the pipe plug thread on the manifold above the carbureter. I always wondered what it was there for. I assumed it was a port for a vacuum guage. Screwed into the solinoid was probably another valve that allowed adjustments. A constant load would not require governor control.

The solinoid valve would be on or off depending on adequate oil pressure, coolant temperature, and over or under engine RPM limits. Once the solinoid lost its juice, even momentarily, it would slam shut. The same circuit would also kill the ignition. All one would have to do to drive away is disconnect the NG hose, flip a few toggles, and turn on the gasoline.

The NG had to have come from a pipeline. LNG is too difficult to store or move for this application. It is a cryogenic gas.

If the switches and sensors were installed in a workman-like fashion, I would leave them. They add interest to the tractor. They could be removed in a matter of minutes with wire cutters and an adjustable wrench. I can't see how they would devalue the tractor.

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Wardner

09-17-2006 00:47:31

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Re: SMTA oddity in reply to Wardner, 09-17-2006 00:37:04

OOOps. Just noticed propane instead of NG. Everything still applies. The regulator would be on the stationary tank. Presumely it would be big enough so that it would not need an evaporator. That's not a big deal either. A heat exchanger using ambient heat would do.

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