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So there is a way to hook up the low side and high side to the back of the compressor backwards and that’s exactly what it was. 🤦🏻‍♂️ I feel like an idiot but I guess you live and learn. Thank you everyone for all your good input!!

@Harry in Ky That is a good thought as well but I have evacuated and charged the system before (last year) when I had to pull the cab to do a mechanical repair and had to disconnect the lines. Did everything that I am doing now but it took Freon and worked fine all last year. Come this year...

@LittleBill21 I think you are right. The core must have an obstruction or somewhere in the AC unit itself

I agree it kinda seems like something is backwards with how different the low and high side pressures are but there is really know way to hook up anything backwards besides the wiring. The expansion valve has an arrow on it for direction of flow and each side of fitting is two different sizes...

@LittleBill21 The shop manual doesn’t say anything about the orifice valve. I don’t think it has one just the expansion valve which I replaced. It does have a dryer and I replaced that. I can’t remove just the suction side of compressor line as the low and high side lines use a special bracket...

Maybe it’s something in the actual AC unit?

@LittleBill21 That is the only thing I can think of being the issue. Where could the obstruction be though? I pulled the low and high tube off the back of the compressor after evacuating and forced compressed air through the lines and could feel it coming out the other end.

@LouNY Yesterday it sat for more than an hour while I was researching stuff with engine off in about 80 degree temps outside the low side was 75psi and high side at 25psi. When the system settles that where it sits at.

@Harry in Ky That was my first thought. Bought the cheap ones first. Now I am on my second new compressor and expansion valve. Straight from manufacturer and still doing the same thing.

@workinonit No matter how I introduce freon into the system the low side goes up to 80-90psi and the high side stops at 50-80psi. Shop manual says to introduce freon at the high side first with engine off the required amount 1.5lbs. Than close high side, start tractor, idle up to 2000rpms and...

@workinonit the freon it calls for is R134a and that is what I am using. It seems the low pressure cutoff switch is working because the compressor clutch is disengaging because it’s at the threshold of to low of pressure to fully engage.

@K5lwq compressor clutch is kicking on and off as it’s trying to pull in freon but won’t fully engage because the system isnt getting enough to trick the system to fully engage. It all started with the pressure relief valve on the back of the compressor blowing off sporadically. Slowly got worse...

Hello, so I am at a loss. My tractors ac pressure (high/low) won’t equalize when charging. Low side goes up to 80-90psi while high side hovers around 50-80psi but won’t take any more freon. All proper steps have been taken per the service manual to evacuate and charge system. I have replaced...

Mike, I agree that every tractor brand is different and has different specs but while in operation it should not be hopping up to compensate for the leak down

Sorry for the delayed response. Yeah, some of the old timers I worked with did their designs by hand back in the day but since I have been working it’s all done on autocad. My old tractor stayed up for what seemed indefinitely when I did have it in the up position after accidentally leaving it...

I deal with a lot of mechanical engineering at my work and all they know is a little auto-cad and can barely do that without making mistakes. You would think with all the technology we have these days the new service manuals would be something worth looking at but sometimes they make things more...

Wow those are probably the best illustrations I have ever seen for anything I have owned. So the stop valve pretty much hydro locks the 3pt when in any up position and like you mentioned it can only leak down from either there or past the piston. The only other way I see it loosing pressure from...

@rScotty Well looking at the MLS valve assembly group, that looks like a whole new can of worms. Not what I thought I saw today when I removed the seat and cover. That looks to be inside the hydraulic cylinder body. They have a seal kit for $72 dollars otherwise I wouldn’t know where to start...

@rScotty thanks for that info. I know the valve assembly is pretty easily accessible cause I had the seat off today, sheet metal cover removed, and could see the whole valve assembly. While I have it apart I might as well clean that up and change those seals as well. I am hoping I don’t see any...

Thank you @TractorTech, I was really hoping I was not going to have to pull that piston out because with the cab it looks like it’s going to be a long knuckle busting weekend for $32 in parts. Thanks again!

Even with the knob turned all the way to the lock position the 3pt hitch still leaks down. It leaks quite a bit slower but still leaks down. I did notice the hydraulic filter housing is leaking a little at one of the o rings. Could that possibly have anything to do with the 3pt hitch leaking...

Awesome thank you very much for the support and quick responses!

Okay thank you. One last questions, any tips/tricks or special tools to change the o ring or backup ring?

The tractor has 1900 hours on so hopefully I don’t have to replace the piston but if I do it’s not too expensive at around a 100 dollars. My concern is I have a DK55c (cab model) and if it really requires removing the cab to get to the upper housing off and access to the piston and seals?

Thank you for the quick response. I attached another picture of a parts diagram to just confirm you are talking about part #8 and #20 correct? Where would the oil be going to if it was seeping past the piston when lifted, just back into the transmission housing?

Hello all. I am looking for some answers to where my leak may be coming from. My three point hitch leaks down when not in operation and when it’s in operation it hiccups. The only noticeable external leak I can see is where the PTO shifter shaft from 540/1000 goes into the rear pto housing but...