Posted by pete 23 on September 03, 2020 at 19:59:12 from (45.52.57.60):
In Reply to: 806 pictures posted by rustred on September 03, 2020 at 15:45:35:
ON the pressures dropping or light coming on when steering to stop, that would be a high pressure problem that is normally a weak pump. But it can be other things that cause oil to escape like leaking o-ring or gasket in mcv.
The older mcv pumps used to blow the diaphragm a lot and I repaired a lot of them years ago. Now days that would most likely not be an option due to parts available.
Normal test of pressures with the two gauges hooked like you have them, you test in direct drive, in TA and then also in the middle position of TA lever. Middle position normally will show a 15 psi drop in the regulated pressure due to a different path oil is taking, and lube pressure may increase some because no oil is being supplied to the TA clutches, either side.
Turning steering to lock and holding will show a drop in regulated and lube pressure if pump is bad or like I said, any high pressure leak . A good pump and system will normally show just a few psi increase in the regulated pressure at steering to stop just because the steering relief valve is now popping off right where that gauge is hooked up.
On the low side of TA the one way sprague (over running clutch does the actual pulling, so even if you had the mcv pump on the bench the tractor will still pull it's self if sprague is good. The hydraulic part of the low side is to prevent free wheeling but will pull tractor under no load and if you saw those little pistons that apply the pressure to that free wheeling clutch you will readily see why they can't pull much load.
I'm sure you already knew a great deal of this information but thought I would just throw this out to you. And that filter looks just fine for 8 hours use.
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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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