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Massey Harris & Massey Ferguson Tractors Discussion Forum
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MF25

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phil

01-14-2004 15:55:32




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I obtained and use a model 25 with the 107 perkins engine, but the previouse owner has pinched off the "thermostart" fuel line.i suspect it was leaking so i plan to install a new one.
Can anyone tell me how this unit worked as in does it need a direct fuel line to it? seperate push on button from the key switch? do i hold it on like a normal glow plug operation then turn the key to start. At present the tractor has a normal off/on/start switch.
And a second question is it normal for the 3 point hitch to lower itself when the clutch pedal is depressed, i suspect a worn hyd cyl/control valve? this happens when ever the clutch is used either in gear to stop the tractor or in neutral to engage a gear?
tks

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Dr. Frankenstein

01-16-2004 12:06:12




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 Re: MF25 in reply to phil, 01-14-2004 15:55:32  
The manual says:
The thermostart is composed of a tubular valve body surrounded by a heater coil with an igniter coil extension. The body is contained in a holder with an open perforated shield, which srews into the intake manifold. The valve body houses a needle, the stem of which holds a ball valve in position against its seating. When the unit is cold, the ball valve is held closed and prevents the fuel (from a direct fuel supply) from entering into the intake manifold. When the electrical switch for the thermostart is turned to the "on" position, the valve bosy is heated and expands, thus, openeing the ball valve and permitting the entrance of fuel. (NB the "on" positin is slightly ccw on my MF25, you can check that with a lamp or voltmeter on the connection of the wire. You can also feel that the thermostart unit and the surrounding part of the intake manifold gets warm / hot after approx 30 seconds. Normal pre-heating time to start the engine at 0 degrees C is approx 1 minute)
The fuel is vaporized by the heat of the valve body and, when the engine is cranked and air is drawn into the manifold, the vapour is ignited by the coil extension, thereby heating the incoming air.
When the electrical switch is turned to the "off position, the flow of air in the manifold rapidly cools the valve body and the valve closes.

If the clutch pedal is engaged the pump stops also and the 3 point will lower. Under the seaton the left side is a knob that controls the speed of lowering the 3 pnt. Depending on the weight on the 3 pnt it will allways lower as if the engine is shut off. With no weight on it it will lower in 10 minutes. With the transmission in neutral and the clutch not pressed the pump keeps working.

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Phil

01-16-2004 17:45:27




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 Re: Re: MF25 in reply to Dr. Frankenstein, 01-16-2004 12:06:12  
Thanks to the good Dr."F" i will soon have preheating abilities, this tractor is an orphan in the tractor world locally, so the extra help is greatly appreciated.
Tks



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Dr.F

01-18-2004 11:41:46




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 Re: Re: Re: MF25 in reply to Phil, 01-16-2004 17:45:27  
It is not an orphan, it is a unique tractor. Probably made in Paris France. The following shows picktures of the old French factory and probably also your 25 known as MF825 here.(8 gears, 25 hp). Basicaly it is the same as the MF130. The 130 has approx 30 hp but it is the same.
Link



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phil

01-23-2004 10:10:10




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 Re: Re: Re: Re: MF25 in reply to Dr.F, 01-18-2004 11:41:46  
Quite interesting piece of history/info, this machine is known as being from France, and being diesel, it was a new style of beast to the "senior" tractor people. Result is it just didn't sell that well locally, i love it enough that it is just arriving tomorrow from it's second engine rebuild. I use it for field [bush mowing] restoring, and have built a side arm mower[hyd driven] for the acess road ditches.
Would like to replace it, but its hard to find anything the same as or as tough as, guess i have become the "senior" tractor person of today:)
Thanks for the help and history.

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