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MM 670 LP fuel

A

Alfalfa Farmer

New User
Anybody have any experience with one of these. Found one that I can buy...drove one 30 year's ago as a kid for an uncle. Like to buy it, but do not know the problems I might face with an LP tractor. Would probably use it some baling hay. Thoughts?
 
Is it still in good running shape? Buy it and enjoy ! Most LP tractors will have engines in better shape than a diesel or gasoline engine would. Cleaner burning fuel with the LP. Not everyone is setup to refuel a LP easily too so that kind of makes them bring less in many areas. In our area it doesn't seem to matter much as most everyone has a LP tank for heating or cooking and another one for tractors or pickups and filler hoses. You might have to put a kit in the carb or LP converter if hasn't been running in a while and be sure to check the valves, popoff valve, lines and tank for leaks before filling the tank full. Your local LP dealer can help with most of that.
 
Ole Shovel is correct on every count. I was a propane dealer for 25 years. Seventeen of those years I installed, diagnosed, and repaired LP systems. The octane rating for propane is 110-120. Compare that to 87 for gasoline. There is little to no carbon in propane so your engine will run more cleanly and if you choose to do so you can go longer between oil changes. There is no better fuel for your engine than propane. The only down side, in my opinion, is the refueling process. Ideally you would want a storage tank and a transfer hose, which your propane dealer could provide. You don't need a pump. You can fill your tractor by pressure differential. Like Ole Shovel said, If you like the tractor, buy it, you will be happy with LP. If you have any further questions, post them and we'll get back to you. There are a lot of good heads on this site and eager to help.
 
I have a M670-LP and I do not plan to part with it. One problem I have had you might want to check out. The line from the LP Filter to the Vaporizer/Regulator is a high pressure rubber hose and it runs within 4 inches of the exhaust manafold. Over the approximately forty years of use it had gotten dried out and decided to rupture and spray vapor (lucky the liquid was not on yet) on the exhaust manafold. I was on the ground near the tractor and was able to get to the Vapor Valve and close it before the fire got too big. I took the remains of the old hose to my local hydraulics shop and got a new one built. It is encased in alumnium foil now and a metal shield will be built to help keep the heat away from that hose. If you buy the tractor look at that hose and think about replacing it on general principles. No problems other than that.
Bryce
 
Hello Blackland Dan.
Your estimate of propane octane equivalent is a bit high. It has an octane equivalent of 98 octane gasoline.
You are right that is a clean burning product and pump high test is only 93 octane , so that is higher octane fuel.
Guido.
 
Actually Guido, that wasn't my estimate. It's a figure I got from LPG training and specification manuals through the years. Just to be sure I remembered it correctly, I Googled Propane Octane Ratings and found several sites that rated propane from 104 to 120. Several rated it 104 and West Virginia University did a study and gave it a 120 rating. Regardless which number you use, I think we can all agree that propane is a very good fuel.
 
They are great tractors. I'm currently farming with a 670 LP that my grandpa bought new. Would work wonderful for haying. Only downside is they hada ensign regulator, vaporizer, and carb and there is only one place that I know of to get parts. Might also want to make sure the T/A is in good working order. My e-mail is open if you want some pics of the 670 doing its thing.
 
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