MF 30b 3 pt hydraulics problem

Steve Foster

New User
This is a MF 30b Industrial w/ loader and box scraper/scarifier on the back, no pto, that I acquired in the present condition. When I bought it, the 3 point lifted enough to get it on the truck, which it will not do now; it was about 20 degrees cooler then.
When I start it up and engage the draft or position control, it will lift a little once or twice, but not to full height, and then won't respond at all; if I rest it, I can repeat, but the response is becoming less over time. Oil level was good and clear. I drained it to the bolt hole, opened the right side cover, and didn't see any leakage or hear any hissing or other noise. I changed the o-rings on the standpipe.
Service manual says to open right side cover to ck for leaks in cylinder, stand pipe, control valve and valve chambers, but doesn't say how. I've learned some from reading other posts, but still need help.
I'd like to check/learn as much as I can about the problem before pulling the lift cover, and try every possible solution short of pulling the cover. Any suggestions will be greatly appreciated. Thank you.
 
I do not know too much about that model, but I assume that there is a port outlet someplace on top of the cover where the standpipe would exit for you to attach a pressure gauge to see how much pressure the pump is putting out. Check that first. If it is little to no pressure, that means that your pump is bad or that there is a leak someplace. With little to no lift like you have, when you remove the side cover you should see the leak or swirling fluid in the bottom of the section.
 
Yes, there is a pressure port on the side of the transfer cap. That's discussed in the service manual. I'll pick up a 5K gauge and ck that.
However, after going back and cking it again w/o starting the engine, I think it may be the control linkage. When I watch the control lever through the porthole, I see almost no movement when I move the position and draft control levers. The last time I cked it running, I got just a little bit of lift as the draft control was moved all the way to up.. and that's where I see just a little bit of movement at the control rod through the porthole w/ engine off.
Does anyone know how much movement there should be, or if there should there be movement of the control rod through the whole range of draft and position control lever movement?
 

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