Trying to keep the operator and engine cool on the new 850j- proves to be no easy task!! 

Mike also another tip, as I did work in the AC industry for a bit. Just as an example if you have a digital readout of your AC temp and the lowest is 60, put it on like 63 or 64 to prevent the dryer from freezing, and use the recirculation button every now and then, for colder air. The system works with less stress if you recirculate the air already inside the cab. Also after a while if you have 3 to 4 selector settings for the fan, the lower the colder. Especially for a moving car.

I kept shouting at the screen for you to clean the condenser coil. You finally heard me toward the end. I feel much better now because I'm a retired a/c tech.

Pulling stuff apart is easy, but putting it back the right way is something else. Top job Mike, big fat thumbs up!

The purpose of that top hole Mike. Is to add a chemical and biological air filter. The issue is you now have no pre-filter. To filter dirt out prior to air coming in to the fans. May I suggest getting a round filter and housing off of an old semi. This can be mounted on top. If it doesn't cause clearance issues. If it does simply pipe it and place elsewhere. Doing this will keep your entire system much cleaner. Less maintenance. God bless

You are much more gracious and forgiving with the seller than I would be. The truth is they are crooked liars. When a used equipment seller states “We ran it through our service department” everyone assumes they mean they have found and fixed the obvious flaws. Hopefully your experience will persuade others to steer clear of them.

I know this much about ac work. Im a residential repair man for ac and if your coil inside is that dirty its a very good chance your compressor may have issues from overheating it. Obviously that poor machine was not ever properly maintained and by looking at the ac system it has been in the desert atleast half of its life

I thought you released your Freon to the atmosphere when you opened it up ( and wouldn’t get a Christmas card from Al Gore) but then remembered it all leaked out already at the evaporator manifold. Great work!

Awesome job. Glad you got it.

You know, MIKE, anyone can spend more money and buy everything DONE (or go to a reputable DEALER) but watching & sharing with you and hoping and redoing is SO motivational for US and I could hear in your voice the COLD AIR on your FACE when you say down & felt it! You 'coined' the phrase, "A winner never quits and a Quitter NEVER Wins"! That's YOU! Congrats!

Can't wait to see it on the job.

Not sure if it was military or not, but whoever ran it in the coal environment put that external air filter on the AC unit....then apparently didn't keep it maintained, based on how bad that unit is packed with coal dust. That can be a problem as coal dust mixed with water is acidic. You can see evidence of that in all the JD yellow areas that weren't painted, and around that filter inlet fitting they installed that are all corroded and the paint lifted. IMO, I would try to steam clean out every nook and cranny of that machine, under every cover, etc... to get all of that out of there, especially inside of the cab. You do NOT want to be breathing coal dust that is blowing around via the ventilation system. All that said, looking forward to seeing Sgt. Slaughter bringing the violence to some dirt once it gets back from C&C.

This was a great video! Very informative! Stay cool out there!

Thanks for the great video Mike!

Really like a complete video like this. Good video.

You worked so hard , you love a challenge and you won.👍

So glad you got the bugs worked out of the ac, it’s a nice feature to have!

Mike a lot of work pays off! Good to see you happy. Thanks for sharing. Kevin

Great work on getting all the issues fixed. Cant wait to see the 850J in action. Hope Mr. Jerry is happy with it and yourself as well.

I have about 6 of those blue socket sets and love them !!!! Good job !!! 👍

Worth all your effort Mike !! Job Done

If your gonna fix it....do it right....you feel so much more happier when you do a job right....we can tell you're a happy man today....😊...🏴󠁧󠁢󠁳󠁣󠁴󠁿

You are the man Dirt Perfect! Your ability to deal with a myriad of problems is awesome. "Git er done"! Very impressive!

Glad that worked out and hopefully C and C will get the other bugs worked out like you explained on the live session last night. Sounds like they are trying to right their wrong. Kudos to them. Stay safe bud.

Good Job Sir. You patience, logic, and determination got you to the end game, AC fixed. Now we know a little about other challenges coming but take the win for now.

Really enjoyed this and gave me confidence to do one on a old foden 3300

And everybodies happy and blessed!

I like your selection of slugging wrenches

Clearly one of your best !..watched it twice

Your diligence reminds me of my earlier years, although I was mainly involved in woodworking. I enjoy watching your videos. It reminds me of my younger years.

Great video Mike. I hope it stays good and cold for you. Have a great day.

Impressed you are a lot more knowledgeable then you let on.. I never miss a day on your videos. Keep up the great work!

I hope it is working good. Nice video explaining how it works too.

At least you had a comfortable spot to work on it. That stand was perfect. You got it cleaned up pretty good and MBTS was there in the end for you, as always!!👍🇺🇸

from the Netherlands thanks for the video DP

Yep I'm excited too!!!!!!!!! What a marathon to resolve the A/C and all the associated problems. Just re-inforces your original comments of the dealer puttting it "through the shop" (I don't think!!) I am always amazed at your comprehensive knowledge and ability to overcome the various problems that arise on this and many other of your maintenance videos. Really well done you. What satisfaction this task must have given you!! Think you deserve a long cool beer after that episode. Cheers from Scotland. Stay safe and welol.

Walking in tall cotton with me on this fix. I never dreamed that they came apart that eh hm... easy as in little to lots of nuts , bolts , and some fine work and its a runner. I just never got into the refrigeration portion of things in my day as I don't remember seeing even a place for it one the rigs... washington and alaska being my states of mechanicing, and even owning big rigs in the late eighties never had air on them... it would of been welcome though. Nice work Mike.

Mike, that's a good looking dozer! It's straight and clean. I had the same AC issues with my Case dozer when I got it. After I replaced a few things and cleaned everything up it has worked purty good since then. I figured out how important it is to keep all the heat and AC clean especially the filters. Good video! I enjoyed it.

Great job!

Love this video Mike .have good day .

Thats a great job well done!

Thanls for the lesson love how you teach us. I believe C&C will do ya right enjoyed the vidja keep up the hard work. Thank u

Thanks for sharing your thoughts and adventures fixing the new dozer. That first night I was expecting to hear the buzz of little flying vampires. Glad for your sake that doesn’t seem to be a issue. Looking forward to seeing more repair and operating videos. Wishing you and your family the best.

God Dang!! I'm excited to. Stressful but great vid, well done Mike

Great job on the AC repairs. I too do all of my AC work and it saves a boat load of money doing it yourself. I used to wrench for a living in my 20’s and do all my work myself - now 61 years old.

Now Dirt Perfect is also Mr. Cool. Good video of a tough job. Glad it worked.

Great video DP

Cool job mr DP

Yoeman's work Michael ! You GOT-ER-DONE !

Awesome job and video, nothing like fixing something someone's already fixed weather right or wrong. But now that it's you gotta fix right , not only so it lasts longer but so it's easier the next time around. Like the splice on the hoses. Hopefully the next failure is something different and not something you did wrong. Pays to do right. Love the video and can't wait to see her in action. Jerry is going to love the A/C and closed cab.

Nice job Mike.

You never cease to amaze me DP! You’re so talented in many ways. Tons of knowledge & willing to share it. That’s just awesome & entertaining. Thanks for making my Saturday night by watching old videos!

Loved it, good luck

I am leaning to it got ran through the shop on a Friday just before quitting time. But it seems to be running good now.

Hey thanks for the input on issues I'm having on ac on my wifies car.

I think you had a lot of fun with that re-construct.

Awesome job DP out on that hot field.

You have so much patience. I had a devil of a time figuring out I had a bad battery that was killing the other battery and when I finally got it solved, I got in my car and it was DEAD!! You probably heard me scream all the way from Texas.

nice job .well explained how things work

Well they say if you want something done right, guess what you got to do yourself. Nice job on the fix on the green mean machine. nice item for the working fleet, good luck with it down the road.

Awesome job Mike you are a magician there is nothing you can’t do

A clean machine is a happy machine!

Great job man I know your happy

My hat (my favorite cowboy hat-s) is off to you on your attention to maintenance~~~~!!!!!!!!

Awesome Job!!

As Arron would say. "Good job DP" Done like a professional AC tech. Real interesting how you used the flag tower to work on it, absolutely brilliant idea. Kinda missed MBTS not being there bantering with you. He's always a hoot to listen to with his gruff Master Sergeant's voice on that teeny tiny frame. Spoke to soon. Arron did show up part 2.0 to help put that radiator brace back in.

I can’t imagine what the radiator looked like before c&c power washed the machine and painted it I almost bought a Kubota articulating loader that came out of a steel factory it was cheap but it was caked with the same type of dust couldn’t even tell color of loader I passed. I can’t imagine what the 850 looked like before they cleaned it up 🪨 you did a great job finishing what they started 👍

Great video 👍 Educational lot's of do's and don'ts ,I would demould that cab head liner!

WOWZERS! That was a PITA to get er properly functioning!

I admire your confidence in trouble shooting things you're not too familiar with. Good Job.(as usual).

Great job Mike..... now I need you to head down to Chris in North Carolina to help him get his DEF problem fixed...lol

Great job DP

Nice job I don’t know how you do it you were lied to about the condition of the dozer. and there you are Big smiles. You are a great guy Keep the videos coming

I have faith in you I knew you'd get it fixed now it's dirt perfect you didn't know what you was getting into but now you do now but way2go you got her fixed hope you have a good day my friend don't work too hard can wait till the next video God bless🙏

Thanks for reminding me why I haven't messed with an a/c system since about 1988. I love having a/c, but HATE working on them, because I get that same thing, what starts with a slow leak ends up replacing most, if not all of the major parts!

Way to go! Thanks for sharing. :)

Dont you love when a plan comes together? Great job, this should make Jerry happy even if he doesn't show it.

Unlike a car the machines that work in dirty and dusty environment require cleaning of all coil's every now and then. The John Deere dozer and highlift I ran for a friend after regular work hours at least once a year I would wash the ac coils and radiator and hydrolic cooling coils. Makes a big difference on the life of the machine and operator.

On my 850k that is just a red dot system but they moved the heater core under the seat so the a/c comes down from the roof and the heat comes up from the bottom. Simple engineering and I love it. The a/c is so cold I only run the fan motor on the lowest setting and the temperature is almost completely out of the blue and in the red, that ole girl still dogs the windows lol

Hey Mike just imagine how dirty that AC was before they ran it through the shop!!🙈🇦🇺

Good job Mike.

That is going to run like a new machine!

hole in the top you can connect overpressure for attack with gas or other chemicals

Enjoyed this video bro it had a cool ending to it too. Safe travels

Nice choice on the time lapse music. Made me want to watch a Buster Keaton movie. I hope all the bugs are worked. That now it's smooth sailing.

Glad you got it all working, you said last nite that some at the dealer were fired for good cause!!!!!!!!!!!!

You sure got a lot of work done without mbts constantly whining. Good job.

Now, time for an unedited first drive review from Jerry. Get out the popcorn!

Good morning DP. Nice to see the upgrade

Hey Mike looks like everything is working great

Those air filters look clean!

Love your vids, From Florida, stay cool D.P.

Nice paint job!

Buddie, that was absolutely riveting!

New A/C in the office is a good day. 👍

Lil tip paint top of cab gloss white helps reflect old daddy sun! We do this in Texas You will be about 20 to 30 degrees cooler!

Put in a on and off valves in will help the ac blow colder air and turn it on in the cold for heat

Nice and cold AC. It’s a good thing.

If this was a military dozer I know that regular soldiers would have maintenance pull the radiator cover off but to take the fan off would go through 3rd shop which is more in depth maintenance personnel with more knowledge than regular maintenance personnel. At least this is the way the Army has it. The soldier who would operate this dozer would do PMCS or Pre Maintenance Checks & Services usually on a Monday and by the operators manual check ever but of the machine and if there are problems maintenance would work work on it but AC is not high on the list to fix nor cleaning good

That evaporator is massive for such as small cab!

I remember back in the mid-1980s working as an Auto Mechanic at a local gas station. We would order a lot of parts from a guy we called "Ronnie Wrong Parts," because no matter how specific we were with the parts numbers, he or one of his delivery guys showed up with the wrong part. It got so bad that we would order the part from him (because his store was very close)and another auto parts dealer at the same time and we would tell Ronnie this and that we would buy the parts from the one that got there with the correct parts first. The funny part about that is that he would make it there first most of the time but still with the wrong part.