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  1. #1
    Silver Member
    Join Date
    Sep 2010
    Posts
    208
    Tractor
    Yanmar YM186D

    Default Transmission/hydraulic oil heater

    Hi all, wanted to share a piece of great news I recently discovered for fellow cold weather operators. My 186D has always been slow to warm up (hydraulic fluid) when it's cold out (below 35 degrees F or so). The pump whines a little and the loader is slow for a while even after the proper warm up. I was hoping to make this better recently with a fluid/filter change and screen cleaning, but it actually got worse. The fluid is proper grade, but apparently just a little thicker in colder weather than the previous. In my opinion the filter being on the suction side (in addition to the screen) is design flaw. This should have been in return, but oh well. This prompted me to look once again for the yanmar transmission heater referenced in the owners manual. No luck finding the PN online this time around either (and I guessed the dealer would be no go or $$$$). I decided first to take a close look on the tractor in the area the manual shows. Low and behold, the square headed plug just forward of the left rear axle appears to be a simple pipe plug, not some fancy hydraulic fitting. I measured it and it jived with a 1/2" NPT (almost 7/8" diameter), so after a little googling I ordered up one of these:

    Kat's 11423 400 Watt 1/2" NPT Frost Plug Heater : Amazon.com : Automotive

    I figured for $24 I couldn't go wrong, and I didn't.

    I installed today without even draining the fluid, just some quick hands (I could tell after a few turns of the factory plug it was very likely NPT), and tested it out. Even with it plugged in for just 10 minutes or so, the tractor was noticeable happier on start up. I'm a happy guy.

  2. #2
    Platinum Member Scotty Dive's Avatar
    Join Date
    Feb 2010
    Posts
    824
    Location
    Ct
    Tractor
    Yanmar 2020D

    Default

    Was starting the tractor easier too? Any chance you have a picture or the schematic from the manual of where this installed? I gave up on removing the engine block plug so I am very interested in this.
    Thanks,

    Scotty Dive
    Yanmar YM2020D "Git er Done Too"
    Pictures! http://s139.photobucket.com/albums/q...t=dfc00199.pbw
    Yanmar Tractor Database - Click Link, then click file and download the excel file.: https://drive.google.com/file/d/0BxR...it?usp=sharing

  3. #3
    Elite Member
    Join Date
    Dec 2009
    Posts
    2,763
    Location
    gilmer tx
    Tractor
    yanmar 2002d

    Default Re: Transmission/hydraulic oil heater


  4. #4
    Silver Member
    Join Date
    Sep 2010
    Posts
    208
    Tractor
    Yanmar YM186D

    Default Re: Transmission/hydraulic oil heater

    Quote Originally Posted by Scotty Dive View Post
    Was starting the tractor easier too? Any chance you have a picture or the schematic from the manual of where this installed? I gave up on removing the engine block plug so I am very interested in this.
    No I don't think this will impact the starting, it's quite a distance from the engine. I already have the block/coolant heater as well, it came with the tractor. It works wonders for starting in cold temps. I would try some penetrating oil/heat and a bigger wrench, in my experience the block heater is a must, thermostart alone doesn't cut it. I will get pics of the manual pages soon.

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