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Fordson Tractors Discussion Forum

changed hydo oil, all stopped working help

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terry spitz

06-29-2010 18:29:34

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I changed the oil in my dexta. worked before, now nothing. first put in #30, now #60 hydro oil. makes a grawling noise, tries to pick up arms. what could I have done to it? what oil should I use? I don't know where to go from here. I did flush with diesel. terry

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terry spitz

07-02-2010 07:57:57

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 Re: changed hydo oil, all stopped working help in reply to terry spitz, 06-29-2010 18:29:34  
thanks, where do I find parts? terry

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kenneth armour

07-01-2010 09:18:40

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 Re: changed hydo oil, all stopped working help in reply to terry spitz, 06-29-2010 18:29:34  
Hi Terry:

Familiar with the MF135, but they are very similar to the Dexta.

You do not have to split the tractor, you will have to lift off the hydraulic cover to gain access to the hyd pump.

Would strongly advise getting a workshop manual before doing anything , as there are linkages you will have to disconnect before removing Hyd cover.

Access to diconnecting linkages for preparation of removing Hyd Cover are through the round covers on the sides of the tractor below the Hyd Cover, you wil have to drain the oil

Changing seals on pump is not hard and there are kits available for the MF-135 so assuming also for the Dexta

Hope this helps

Kenneth Armour

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Cameron Smith

06-30-2010 06:06:57

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 Re: changed hydo oil, all stopped working help in reply to terry spitz, 06-29-2010 18:29:34  
Kenneth is right. You should flush with kerosene, NOT diesel. It sounds like the seals gave up. Check out as it is a great site for all things Fordson and a search of the forums there will give you the straight dope on flushing. Good luck!

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07-02-2010 17:46:51

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 Re: changed hydo oil, all stopped working help in reply to Cameron Smith, 06-30-2010 06:06:57  
Diesel won't hurt your seal anymore than Kerosene!!!

Fuel 101 by Richmond Laney
The difference between Diesel Fuel and kerosene
The differences between Kerosene, jet fuel, #1 Fuel oil, #2 Fuel oil, heavier fuel oils, gasoline, etc. are the types of hydrocarbon chains that are separated and concentrated during refining and additives. For example gasoline has an octane rating which compares the gasoline blend with the performance of pure octane hydrocarbon with eight carbon atoms. Diesel has a septane rating, please note that septane has seven carbon atoms in its chain. Octane rating is how hard it is to ignite and septane rating how easy it is to ignite.

What this all means is that the heavier fuels have longer hydrocarbon chains, higher BTU content, are thicker and are more tolerant of contamination (also they are allowed to contain more sulfur).

K-1 Kerosene, #1 diesel, and jet fuel (JP4) are closely related to each other. #1 and JP4 have higher allowable sulfur than K-1 (kerosene is also called coal oil by old timers). Since #1 is a shorter hydrocarbon blend it has better solvent properties than #2. (We used to clean out our armored vehicle engine compartments with diesel fuel in the Army, also gasoline used to be sold as petroleum naphtha as a cleaning solvent before it became a motor fuel.) It also has a lower gel point, which means that it takes a colder temperature to turn it to a molasses like thickness. Because these fuels are blends they don't freeze like water, they act more like Jell-O slowly getting thicker until they set. This is why in cold climates it is suggested that #2 be blended with kerosene to keep it from gelling to soon. (Mercedes suggests using up to 30% gasoline in very cold climates).

In the US fuel oils are blended according to climate and location and there are also additives that control gel point, contamination (like water), change the flash point, to identify different uses (dyes) etc.

There is no real benefit to using kerosene /#1 over #2 unless you need to because of cold temperatures or you just want to clean out your system. If you switch to #1 please change your fuel filter to avoid clogging from any gunk removed. As it has been pointed out #2 has the higher heat (BTU) content.

All of this is good to know as in a pinch you can use diesel (or kerosene) in your furnace as a correspondent in Florida recently did during a cold spell when he couldn't get a delivery of fuel oil right away. (Conversely you can use fuel oil in your diesel car but the Feds don't like that as it is not taxed as motor fuel, Several times I have put motor oil in diesel engines when I have run out of fuel.) Personally I would use whatever is cheapest for that area, temperature range and manufacturers recommendation. This means #2 for the most part.


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terry spitz

06-30-2010 12:44:59

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 Re: changed hydo oil, all stopped working help in reply to Cameron Smith, 06-30-2010 06:06:57  
where do I get the seals? how can I fix this thing? where do you get the filter? am I going to split the cases? I wish I would have asked before, someone said to flush with diesel, so I did. terry

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kenneth armour

06-30-2010 05:45:21

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 Re: changed hydo oil, all stopped working help in reply to terry spitz, 06-29-2010 18:29:34  
My understanding is if you flushed with Diesel, you most likely compromised the seals in the pump.

Kenneth Armour

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