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hyd. oil

S

sam in mo

Member
I am working on a tractor that the hyd. oil looks like it has water in it to me. The owner says that the oil is the proper oil for the tractor. The loader will raise all the way up when empty and just a foot off of the ground with a dry bale of hay on the forks. The oil is milky and the res. is full. Does any one know if there is such a hyd. oil that looks like it has water in it or is this one of those things that if it looks like a duck it is a duck. The tractor is a 175 mf. Thanks Sam
 
Sam,

Sounds like engine oil and hydraulic oil are mixing together.. I had a Ford 3000 which would suck engine oil back to the hydraulic reservoir - I had to replace the seal on the pump !!
 
Park the tractor for 24-48 hours, in a warm place. Then slowly open up the hyd drain plug very slowly so when it gets close to being all the way out if it has water in it you will start to see it dripping. That said even with water in the hyd oil unless you have a lot of it the loader should still work fine ya not good for it but still should work. Sounds more like you have a pump pressure problem or bad seals etc. To be sure put a pressure gauge on the system to find out what pressure you have. You can get those gauges form most farm and home places for around $20 or so
 
Just talked to the owner and he said that the tractor had Shell Donax TD in it. Does anyone know what the Shell oil looks like stright out of the bucke? Thanks for the reply. Sam
 
If it is cloudy or milky it has water in it. If the loader won't lift a bale,you have a pressure problem,relief valve is stuck or bad, or a worn out hydraulic pump. You didn't say if it had a front pump or using the belly pump in the tractor. Usually a crankshaft driven front pump should put out somewhere in the 1500-2000 psi range. If it's using the tractor's belly pump it should be in the 1200+ range.
 
I suspected that was the case.I am going to change the oil in it and see if the relief valve will start working. The tractor was working fine one day and the next time it was used a couple of days later it started getting sluggish and finaly wouldnt do anything. They cleaned the filter in the bottom of the case but it still isnt working right. Thanks for all the info and help. Sam
 
If it is as cold in your area as it is here at the lake of the Ozarks area you could have a problem with that water freezing and that will cause odd problems like what you say you have. I would pour in a bottle maybe 2 of HEET run it a few minutes then drain it. The heet will help drain most of the water where as with out it you may have a lot of water still in the system. Also running it long enough to get the oil good and warm will help you drain more of the water then to drain it when cold
 
It will be next week maybe before I get back to the tractor. Dad had triple bypass last friday at Jeff city and is suposed to come home tomorrow. I"ll probably stay out there in Gasconade co for a few days. Thanks for the help and sugestions. Sam
 
Had problems like that last year on my Ford 841 and after pouring in the heet and leaving it in and then running it for about 30 minute an draining and refilling all has been well
 
Oh so your also not all that far from me. Sorry to here about your dad but at least you still have him. I lost my dad about 5 years ago. Hope he does well
 
If the loader runs off the internal hydraulics, you should be using MF Perma-Tran fluid. At least something that says it meets Perma-Tran or M1129 specs. MF Perma-Tran works the best though. Dave
 
Water is not the only thing that will make oil milky looking. A high pressure leak will foam the oil and make it white/milky looking. If you take a sample and heat it up it will separate. I usually take a quart jar and fill it half way with the oil in question. I then put a pan of water on the stove and set the quart jar in the pan. Heat the water and it will heat up the oil in the jar without any fire hazard. Water and air will stay suspended for a long time just setting around. Heating it it will separate in just a few minutes. Then you are not guessing what is in it.

If you have a high pressure leak that would explain your lifting problem. MFs are bad about the pressure relief valve leaking in the internal transmission hydraulic pump. They will foam the oil. Your MF 175 can have two different hydraulic pump setups. One is the transmission one only and the other has an engine driven pump for the selective control valves plus the transmission one for the three point.
 
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