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Massey Harris & Massey Ferguson Tractors Discussion Forum

MF 65 Can the hydraulic pressure be changed?

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Phil Irvine

08-27-2007 19:18:20

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My MF 65 has a front scoop using a one way diverter valve. The scoop has manual trip so just the lift rams. I find that the hydraulic pressure is barely sufficient to lift the scoop if is is dug in to the dirt. I generally have to back up slightly to allow it to break free.

Can the hydraulic pressure be increased, perhaps by adjusting a relief valve. If so where is it?

Phil

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Jerry/MT

08-28-2007 12:29:31

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Re: MF 65 Can the hydraulic pressure be changed? in reply to Phil Irvine, 08-27-2007 19:18:20

The simple answer is no. And adjusting the relief valve will only give you a little bit more maximum pressure before it releives. If you are running at max engine speed and the lift isn't sufficient you're either overloading it or the pump is too small or worn.

A lot of these old loaders were meant to pick up manure from the barn, not for excavating work. Putting a pump on with more flow capacity and higher pressure may not be the answer either. You'll just break the next weakest link. However, as the others have noted either a crankshaft driven auxiliary pump or a pto mounted pump will allow you to have an increased flow and pressure. They will also probably require a separate reservior unless you can plumb them to use the existing tractor reservior.

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marlowe

08-28-2007 03:33:55

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Re: MF 65 Can the hydraulic pressure be changed? in reply to Phil Irvine, 08-27-2007 19:18:20

what pump you useing the one inside the tractor or front mounted ?

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Gerald J.

08-27-2007 19:41:49

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Re: MF 65 Can the hydraulic pressure be changed? in reply to Phil Irvine, 08-27-2007 19:18:20

Safer to increase the diameter of the lift cylinders.

Gerald J.

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Phil Irvine

08-27-2007 20:53:29

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Re: MF 65 Can the hydraulic pressure be changed? in reply to Gerald J., 08-27-2007 19:41:49

Unfortunately that would make the lift speed slower. It is not great even now.

Phil

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Gerald J.

08-28-2007 09:30:31

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Re: MF 65 Can the hydraulic pressure be changed? in reply to Phil Irvine, 08-27-2007 20:53:29

Quite true, but the internal pump isn't really made for such service and it may be worn. I don't know its specifications but those for my MF-135 are only like 3.6 gpm but pretty good pressure. A test of wear might be to compare how it pumps at engine idle vs engine screaming speed. If high engine speed makes it pump better, its worn and part of your problem. Changing the pressure relief setting won't make up for a worn pump.

The MF-236 loader on my MF-135 has always used an eternal pump, originally on the PTO and later running from the engine crankshaft with the shaft going through the center of the hollow front axle pivot pin. That load fits my JD-4020 much better.

Gerald J.

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Our Farmer

08-28-2007 05:56:02

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Re: MF 65 Can the hydraulic pressure be changed? in reply to Phil Irvine, 08-27-2007 20:53:29

No matter what you do, the internal pump isn't going to supply enough for a satisfactory operation of a loader. You need to install a front pump. You may need to change the steering arms to ones with a longer drop, and plumb up a feed and return from the trans sump. Easy enough weekend job, lot's of info available on the site as to how to do it.

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