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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Bleeding loader lines/cylinders - MF100

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Steve_Colo

10-09-2006 10:08:20




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I removed my MF100 loader from my '58 MF50 to repaint it.

I drained the hydraulic fluid and need to refill and bleed the lines. Are there general guidelines on how to bleed the lines? If I have to, I will remove the lift cylinders and invert them to allow them to fully fill with oil and let gravity help me. I presume you can also use a large syringe to fill any lines as full as possible before reattaching them?

I searched this form and cannot find any tips on loader line/cylinder bleeding. I'd appreciate any tips any of you can provide!

Thanks,

Steve

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SteveH_Colo

10-10-2006 08:26:03




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 Worked perfectly - - Re: Bleeding loader lines/cyl in reply to Steve_Colo, 10-09-2006 10:08:20  
I added 5 gallons of AW-32 oil last night (not exactly Type A tranny fluid, as specified, but it's what I had) and the loader worked perfectly. I was doing this in the dark, in a rainstorm, in an attempt to get the tractor indoors.

Anyway, the system self-bled (just as you both suggested) and the loader operated just as it did before.

Thanks again!

Steve



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Gerald J.

10-09-2006 11:51:20




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 Re: Bleeding loader lines/cylinders - MF100 in reply to Steve_Colo, 10-09-2006 10:08:20  
Tain't like car brakes with pressures only 750 psi (50 atmospheres) and where sponginess causes trouble. With pressures up to 2250 psi (150 atmospheres) a cylinder full of air when connected soon has only 1/150th of its length air under full load and at that pressure the air gets dissolved to be released in the reservoir. At load the original air amounts to only 1/6" inch in a 24" strok cylinder. You'll hardly notice that the first stroke and won't after a few strokes.

Gerald J.

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SteveH_Colo

10-09-2006 11:57:46




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 Re: Bleeding loader lines/cylinders - MF100 in reply to Gerald J., 10-09-2006 11:51:20  
More great information - thanks for the scientific reasoning. I've done lots of car brakes and a few power steering systems - so this should be interesting.

Thanks Gerald!

Steve



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DavidP, South Wales

10-09-2006 10:25:48




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 Re: Bleeding loader lines/cylinders - MF100 in reply to Steve_Colo, 10-09-2006 10:08:20  
There is not normally any requirement to prime or bleed a hydraulic system such as a loader. If for example a front mounted pump is fitted it is worth introducing some oil into the inlet side to assist start-up and suction. If your pump is in the transmission case it will be immersed in oil anyway. As oil is heavier than air the rams will soon fill and the air find its way back to the reservoir or out past the seals.
DavidP

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Steve_Colo

10-09-2006 10:31:05




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 Re: Bleeding loader lines/cylinders - MF100 in reply to DavidP, South Wales, 10-09-2006 10:25:48  
Yes - the pump is front-mounted (runs off the crankshaft) and oil should gravity-feed to the pump. However, I will try to be sure the front pump sees some oil before starting the engine to start the priming process. Perhaps I'm needlessly paranoid about this.

Thanks for your quick reply.



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