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  1. #1
    New Member
    Join Date
    Jul 2014
    Posts
    5
    Location
    Tx
    Tractor
    399 Massey Ferguson

    Default MF tractor ac needs freon

    I have everything needed to put Freon in my MF tractor ac, but I need more know-how on what to do....steps, pressure etc.. Does anyone know of a place on the internet or on this forum that gives this info. I'm new to this site and I'm trying to get my hay baled in this Tx heat without an ac (I'm actually asking this for my husband at his request who is in the hay field as I type) I know the tractor is a Massey Furgeson, I think he said it is a 399. Any suggestions and or info is appreciated. I tried youtube, but couldn't find what I needed.

  2. #2
    Silver Member
    Join Date
    Mar 2008
    Posts
    221

    Default Re: MF tractor ac needs freon

    If the tractor is a Massey Ferguson 399 with a Sanden compressor then the tractor uses 3.1 lbs of R134, 7 oz of oil, and use 150 viscosity oil when you purge the system. I do not know how to put it in on your tractor, hopefully someone else can explain that.

  3. #3
    Elite Member Tx Jim's Avatar
    Join Date
    Jan 2007
    Posts
    4,854
    Location
    North Texas
    Tractor
    JD 4255/Kubota M7040 HDC

    Default Re: MF tractor ac needs freon

    Yes it was hot in Tx yesterday & going to be the same today. Are you sure that evaparater,condenser & cab filters are spiffy clean???????????? Farm machinery AC systems operate under adverse conditions so AC components need to be cleaned regularly. Coolant has been known to be added to AC systems when indeed NONE WAS NEEDED. I'm assuming your MF 399 has R134A for AC coolant. Here's the pressure chart. Hose quick couplers are 2 different sizes for high & low so will only attach the correct way. When adding coolant only open low side gate valve on gauge cluster.
    Attached Thumbnails Attached Thumbnails -capture-jpg  

  4. #4
    New Member
    Join Date
    Jul 2014
    Posts
    5
    Location
    Tx
    Tractor
    399 Massey Ferguson

    Default Re: MF tractor ac needs freon

    Thank you Jim and Sportsman. Good info. This is a great site. So glad I found this site with guys like you ready to share info. I've seen Freon added to my tractor a few years ago, but I didn't know the specifics to be able to do it myself. Jim, thanks for the chart and I will check the components you suggested.

  5. #5
    Veteran Member
    Join Date
    Oct 2011
    Posts
    1,040
    Location
    Olalla WA, Kitsap Peninsula, West of Seattle
    Tractor
    Kubota BX25

    Default Re: MF tractor ac needs freon

    If you have to add refrigerant (Freon is a brand name), make sure you do, then find the leak first or you will be doing it over. Low on refrigerant always means a leak somewhere. Most common are mechanical joints and compressor shaft seals. If you have been operating in a vacuum then there are bigger considerations, air and moisture in the system.

    AC service is not a DIY project unless you have all the proper tools and at least a basic understanding of heat transfer theory and refrigeration system operation. A leak detector, gauges, vacuum pump, accurate digital scale, oil, refrigerant, and some special tools will set you back around $500 at Harbor Freight. If you add too much refrigerant you can destroy the compressor. Not adding the right amount of oil can do the same either way. A leak will leak oil also as it is carried by the refrigerant. Low refrigerant also means low oil. Most automotive compressors are difficult to asses the operating oil level.

    Ron

  6. #6
    New Member
    Join Date
    Jul 2014
    Posts
    5
    Location
    Tx
    Tractor
    399 Massey Ferguson

    Default Re: MF tractor ac needs freon

    Thanks Ron, lots to consider. I finished one of my hay fields yesterday and a guy that has worked on tractor ac's in the past is coming Thursday to help me check it out. I plan on using the info you all shared with me to help me understand the process since he is going to walk me through it while I do it, which is how I learn best. So glad I found this site. Thanks again

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