YM1602 hydraulic / transmission case water issue.

   / YM1602 hydraulic / transmission case water issue. #1  

grumbolt

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Nov 17, 2025
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Tractor
yanmar ym1601
i recently changed the clutch in my newly acquired YM1602 and noticed when i drained the transmission that there was a massive amount of water in the case. like several gallons more water than oil actually.. this concerned me so it has been nagging at me to figure out where the water came from..

having to disconnect the pump lines to be able to split the case for the clutch job, i discovered the water..

i spoke to my buddy who had bought it with the idea it only needed a clutch, and then lost interest in it when another project grabbed his attention and he said he hadnt even checked the hydraulic oil levels since he unloaded it off of the trailer, the hydraulics worked and he wasnt going to be using it till he went through it so it was a non issue at the time.
the only thing we could come up with was that maybe the previous owner just filled the case with water to get the hydraulics operational to show it to prospective buyers and get it to load on the trailer etc..

honestly there was more water than there was oil. after getting everything back together and cleaning / flushing out the lines and case, the hydraulics work smoothly and i think i may have gotten lucky and nothing was damaged.

that being said, have any of you experienced excess water in the transmission case? i am trying to figure out where it came from so i can prevent it from doing it again!
 
   / YM1602 hydraulic / transmission case water issue. #2  
Typically water finds its way through to the inside of the transmission via the shift levers. The rubber boots usually get hard and cracked over time and lets water in.

If the tractor sat outside, uncovered, then it could very well get a lot of water in the transmission.
 
   / YM1602 hydraulic / transmission case water issue.
  • Thread Starter
#3  
Typically water finds its way through to the inside of the transmission via the shift levers. The rubber boots usually get hard and cracked over time and lets water in.

If the tractor sat outside, uncovered, then it could very well get a lot of water in the transmission.
good call, i will check the boots etc.. looks like i may have to build a lean-to or shed to store this little guy in lol
 
   / YM1602 hydraulic / transmission case water issue. #4  
good call, i will check the boots etc.. looks like i may have to build a lean-to or shed to store this little guy in lol
That would be prudent. The shift lever boots are a perennial problem.

All the best, Peter
 

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