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Minneapolis Moline Tractors Discussion Forum

M604 - coolant plugs in jugs

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Author  [Modern View]

07-05-2019 05:57:27

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Does anybody know what thread these are - the ones on the right-hand side of the cylinders? Mine were still sealing but with corrosion and thread damage. Local hydraulic shop said they were NPT. Bought a couple of replacements but they didn't want to screw in - didn't want to push it and risk damage . Suspect the threads in the jugs are also corroded and need to be cleaned out but reluctant to attack them without knowing for sure they are NPT.


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Ill John

07-05-2019 06:19:08

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 Re: M604 - coolant plugs in jugs in reply to Handclutch, 07-05-2019 05:57:27  
all the ones I've seen are 1/4" NPT

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07-07-2019 05:01:27

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 Re: M604 - coolant plugs in jugs in reply to Ill John, 07-05-2019 06:19:08  
They are 1/4 NPT. Cleaned the threads with a tap - somewhat difficult to turn, they were quite corroded. New plugs tightened up nicely.


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charles leddy

07-07-2019 05:44:55

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 Re: M604 - coolant plugs in jugs in reply to Handclutch, 07-07-2019 05:01:27  
Did you put drain petcocks in? makes it a lot easier to drain when you need to. Cleddy

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