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MF 50 hydraulics not working


 
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Bob M
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Joined: 28 Dec 1997
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PostPosted: Mon May 17, 2021 12:33 pm    Post subject: MF 50 hydraulics not working Reply to specific post Reply with quote

Background: A brother who lives on the other side of the state has an MF 50 with a 3 point bushhog. The 3 point worked fine the last time he used it in October. But this winter he started and attempted to move the tractor but found the transmission was locked up solid. I told him probably water in the tranny had frozen (the tractor sits outside) and to wait until the weather warms then drain/refille the transmission.

This he did - he drained out several gallons of water then some milky gear oil. He then refilled the transmission with fresh 85W-90 gear oil.

The tractor now shifts/drives fine. But the 3 point lift is totally inoperative.

I suspect either the hydraulic pump got damaged when he ran the tractor with the tranny frozen, or 85W-90 (which I gather is NOT the correct oil to use in the transmission) can't be picked up by the pump.

Any guidance here is appreciated! (I'm a Farmall/Oliver/MM guy - have no experience on MF equipment...)
 
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John Deere D
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PostPosted: Mon May 17, 2021 4:49 pm    Post subject: Re: MF 50 hydraulics not working Reply to specific post Reply with quote

The PTO is usually driven from the REAR of the HYDRAULIC PUMP, if and when the PTO is engaged to operate.

Does the PTO shaft turn /rotate when engaged to operate?

If PTO is not operating when the PTO lever is engaged let us know.....

Bob...Owner MF ....
 
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Bob M
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PostPosted: Mon May 17, 2021 6:16 pm    Post subject: Re: MF 50 hydraulics not working Reply to specific post Reply with quote

Good to know! Will pass on to my brother and advise what he finds.

Thanks!!
 
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Steven-Id
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PostPosted: Mon May 17, 2021 7:01 pm    Post subject: Re: MF 50 hydraulics not working Reply to specific post Reply with quote

The 85-90 at gear oil is too stiff. The manual called for a 85-90 at mineral oil. That is a lot thinner. I just run a universal trans- hydraulic fluid in mine. How ever I bought a 65 that the pump had frozen and broken the casting. He might try different oil but not fill it full. Leave the level just below the inspection cover where the dipstick is and look inside while it is running and see what is going on.

Steven
 
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jvin248
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PostPosted: Tue May 18, 2021 3:17 am    Post subject: Re: MF 50 hydraulics not working Reply to specific post Reply with quote

.

Make sure he replaces the shifter boots. That's where most of the water leaks happen. Rainwater lands on the shifter and follows it right down along the shifter rails locking them up. I just got done replacing bearings and gears in a 1955 TO-35 with a flooded and locked up transmission.

I'm still working on the engine end of the tractor now but the plan is to find a secondary boot (like half a truck ball joint boot) to mount on the shifter shaft just above the tractor boots that has a clamp spring to be a roof that sheds water away from getting into the transmission.

.
 
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Tom from Buckeye Lake
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PostPosted: Tue May 18, 2021 5:51 am    Post subject: Re: MF 50 hydraulics not working Reply to specific post Reply with quote

(like half a truck ball joint boot)

I've new boots on my 150. When it sits outside I put a Dollar Store bucket over the shifters. Works for me Smile
 
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