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ok, you HAVE to use mobil 1 15w-50 on the exmark hydro pumps. they do not have an oil cooler, so it can heat up pretty good. you have to go by the manufacterers recomendation on what to use. you can shread a hydro in weeks with the wrong oil. so, check, and double check your manual, and make sure of the stuff you are using, that hydro pump was owned by the local exmark dealer, one of his employees "didn't know" and put in 30w.
 

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Armando Conti said:
TC mentions, in a thread about Wright Sentar, a failed hydro pump due to not using synthetic oil. He shows pics of failed parts. Is there good evidence that synthetic is the way to go in hydros?
Non synthetic oil requires viscosity modifiers (essentially liquid rubber) in the additives package to maintain viscosity with changing temperature. Full synthetics (versus synthetic blends) are able to maintain their viscosity without the modifier. Viscosity modifiers start breaking down with high temperatures and form sludge and loss of viscosity - this will shorten hydro life dramatically. Don't trade oil cost for hydro life - use synthetics when called for.
 

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Discussion Starter · #5 ·
The unit is a Ferris dual hydro 48, which calls for straight 30 or 20. No mention of synthetic or not. I don't know if I've seen straight weight synthetic. I think I'll stick with regular oil unless I see a straight weight synthetic.
 

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Armando Conti said:
The unit is a Ferris dual hydro 48, which calls for straight 30 or 20. No mention of synthetic or not. I don't know if I've seen straight weight synthetic. I think I'll stick with regular oil unless I see a straight weight synthetic.
I have a Ferris and it requires 5-50 synthetic.

They have straight 20 and 30 synthetic. it not cheap 4.00 -5.00 a qrt.

Castrol makes it and you can also buy Mobile

You better use it because they will not replace your pumps if they fail. and they are not cheap. 486.00 each on a ferris. I know both of mine failed the 1st 60 hours i had it. dealer never set the machine up right. I didn't have to pay for them but that what happen they used the wrong oil.
 

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I have always used what's reccomended. My z master calls for mobil 1 sythetic 15w 50 so that's what I use. The engineers USUALY know more than we do about this stuff. If it calls for 30w use that. If it gets really hot I would consult a factory rep about going to a synthetic. Mine doesn't have a cooler just a finned resiviour.
 

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right, proscapes has the same hydro setup as I do.

just read the manual before you pour, and if you should pour the wrong stuff in there, take it out immediatly, and flush the lines out. if you should run it with the wrong oil, drain the hydro oil, and look for "silver streaks" in the hydro oil. if you see them, it's components of the hydro system wearing down because it wasn't lubed right. after that, you will notice your mower slowing down. before they are totally shot, you would probably be moving maybe half speed.
 

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Discussion Starter · #9 ·
I've used straight weight as manual says, I have not played around. I will call the factory about synthetic. This is the integrated Eaton transaxle that Ferris uses, 2 on the dual hydro. I figured that cost would be much more than the above quoted $600 something.
 

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Armando's hydro system is a little different that ours being that it is on a Ferris hydro walk. They use Eaton hydros. It would be best if he called the factory to confirm what to use.


Now I on the other hand have a question. I have had ZTR's and now newly have a ZTR that calls for regular 20w50 motor oil in the hydro system. The previous ones called for 'conventional' 20w50. The current one does not specify. These 20w50 systems are always high capacity. I bet the current one might be near 3 gallons because it has a 10 qt reservoir and a 1 qt filter.

I haven't called to ask, but I'm guessing this one is also designed to run dino 20w50 due to the large capacity. So, with that in mind, if it were your machine, would you convert it to synthetics? If so, then what synthetic? I'm not too much up on them, but I'm thinking amsoil is the only one I can think of that offers 20w50 synthetic. Stuff like mobil 1 is 15w50.

Personally I'm all mixed up about what to think of all this. On one hand, I can't see why synthetic oil would hurt anything, but on the other I don't know that much about it. I'm also thinking that maybe you could use it, but maybe it's really not needed due to the high capacity design of the system because most of the synthetic systems only have a 2 or 3 qt capacity v/s 2 or 3 gallons.

I'm also thinking the thought process of those engineering are looking at the cost of the fluids for a fluid change. One guy is pro-synthetic, where as the next guy says to himself, for the cost of 3 qts of synthetic, I'd rather have 3 gallons of conventional oil circulating in the system.

What do you all think?
 

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well, the reason I use syn in my hydro's, is because that's what exmark says, infact, they've got a nice BIG label on there say don't use anything besides it. I can see why too, if you run it for 3 hours straight, them hydro's get pretty hot. I've often thought about putting a fan on the shaft to pull some of the hot air down and out.

as far as your mower, I would CALL the service department. if you can run syn, I would, because you have to use stuff like liquid rubber to increase the vis of dino oils, something you don't have in syn blends.

I must say though, with a one quart filter, and a 3 gallon system, I don't think that the oil is going to heat up too much.
 

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Yeah, it has a 10 qt tank and a 1 qt filter. So that's 11 qts and I figure it will be a 3 gallon system with everything full. It also has fans on the pumps and the pumps are mounted close enough to the wheel motors that they get some air movement off the fans also I guess.

So maybe it doesn't need the synthetic. But I don't think it would hurt either. I'll call to see what they say. If it's OK I might spring for the extra cost of the synthetics. It will cost $70 or so for just the oil. But it might be worth it in the long run?
 

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Thats a good question envy. Remember Most vehicals dont say use a synthetic but its ok. I would ASSUME it would be ok after break in but with that much capacity would you really need it? PROBABLY wouldnt hurt and you may be able to go a little longer between fluid changes. Synthetic containers I have seen usually state that they are fully compatible with convetional dino oils. To bad we cant make gas out of synthtics!!!! Rain here is gone today so hopefully we will get all caught up tmrw. Going to be a longday thats for sure.
 
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