Posted by andy r on March 04, 2018 at 19:31:48 from (166.181.87.71):
Since it has warmed up I thought I would get back on the Farmall 706 with no brakes or steering. Last fall while running an auger I found the oil light blinking. Knew it wasn't the engine and sure enough no power steering or brakes. So, I pulled the tractor aside and put another one on the auger. During a wet spell when I couldn't combine I started the tractor again and just happened to back it up a slope and the pump started. Steering and brakes were normal. Before I finished beans the tractor had lost its steering and brakes again. I had sort of blamed it on transmission fluid with too much water in it.
So, here is what I have done to try to remedy the problem:
1) changed filter 2) air temperature well above freezing for several days - nearly 60 degrees the past couple days 3) made sure the transmission oil was at "full" 4) pulled 5/8 inch bolt on the lower back side of the MCV to help prime pump 5) put compressed air into transmission filler neck - enough to get a big gush coming back out when I take the rag away 6) oil looks to be in pretty good condition 7) 2 point hitch and hydraulic valves work
Still no steering or brakes. No oil coming out of the 5/8 inch head bolt taken out to help prime the system
Don't know what else to do!!! Possibly increase the oil by another 5 gallon????? It is full to slightly over filled. I thought compressed air would push it to the MCV pump.
Do both the MCV pump and hitch pump get their oil through the casting cavity where the filter goes??? If so I assume the pumps have to create a vacuum to get the oil into the cavity and through the filter or does the hitch pump pump some in there? Since the hitch pump works the filter cavity must be filling. I would think that would easily make its way to the MCV pump.
Any ideas appreciated. I suppose the next step is a new MCV pump???
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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