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Discussion Starter · #1 ·
bought the murray new 6yrs ago. 20hp/46 cut Hydro..been running great,but now seems to like keep slowing down the longer you mow..will travel fast first 15-30 mins then just seems to go ony at a walking pace (slow).. I know not much on hydros..not making any strange noise so to say.. Have the manual on it BUT nothing for the hydro..all I can seem to see is a rubber tube with screw in it.. Is this the oil filler?? and how much and what type??Its not leaking any oil and the belt is good/not wore..Belt not slipping as far as I can tell..Is this worn out,low on oil,filter?? I mow maybe 1 time a week,,perfect level yard, and maybe 1hr when I mow,1 acre. Nothing else wrong with this at all.. Any info would be helpfull.. Thanks,Ross
 

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i don't know what type of hydro it has, but that is a classic symptom of old oil. whether an oil change will help it or not is luck. try to change the oil if you can, usually this requires removing the tranny and dumping it out the vent then refilling the same way. if that don't work, time for a new machine unless you can find a decent used hydro. a new one would likely cost more than it is worth.
 

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Discussion Starter · #3 ·
Thanks Dav, I have universal trans/Hyrolic oil I have used in a 60hp Case and a Hinimoto E14d..Will that work or do I use a special type oil instead???
 

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Thicker oil may help delay the "slowdown" some..loss of viscosity when the oil heats up can cause this,but so can wear in the internals..

I had a Dynamark with a hydro that slowed to a crawl after 20 minutes or so,in order to cut my 2 acres I'd have to stop and let it cool down at least 30 minutes and then it would move faster again,but the crawling returned sooner..I tried draining the oil from the hydro as much as I could using a suction gun that looks a lot like a grease gun throught the filler tube (that one had a small resiviour like a car master cylinder)..it had no drain plug!..

I refilled it with 20W-50 oil ,which was what a local mower shop said they would have used,then it took a few moments longer for it to act up,but still ended up "slipping"..then I tried adding some STP oil treatment to thicken it up,after that I could go almost an hour before it slowed again..
How long it lasted after ,I dont know,I sold it to a guy with a small lawn that didn't care about the tranny issues,but I bet its still working,maybe not any better however..once the "guts" in the pump and the tranny case wear some,there aint much you can do about this but replace the whole unit,if an oil change fails to improve it..
 
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