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Old 06-04-2006, 12:15 PM   post #1 of 14
brucepalo
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Question what type hydrostatic oil to use

Hi-
I have a ZT16 w/ 44"deck. What type oil should be used in the hydrostatic transmissions? Mine is VERY black and apparently these machines do not have filters in them. I bought this unit new about four years ago and the place I bought it from just sells them, they do not have a service garage.
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Old 06-04-2006, 12:45 PM   post #2 of 14
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Default Re: what type hydrostatic oil to use

Some units use 20W-50 motor oil. Other units use other types of oil. Google "ZT16 Hydrostatic Transmission" and see if you can't find some information on the proper maintenance for it and the proper fluid to use. Perhaps someone with a ZT16 Tranny will come along with the info you need.

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Old 06-04-2006, 12:59 PM   post #3 of 14
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Default Re: what type hydrostatic oil to use

Welcome to the forum Bruce. I googled Zt16 but didn't come up with anything. Who makes it? Do you have the manual? My Cub uses 20-50# but yours may be different. How many hours do you have on the oil? Should have a filter, might be intank one. if it doesn't have a filter I would add one. Not that big of a job. Little more info would help,theres alot of help here for the asking. Mike
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Old 06-04-2006, 01:15 PM   post #4 of 14
brucepalo
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Default Re: what type hydrostatic oil to use

Sorry about that. The make is Simplicity. And I too have done multiple googles with no luck. It does not have a filter. There are (2) transmissions, (1) for each rear wheel. And there is a reservoir for each w/ a small tube between them for maintaining level in both. I have been thru the manaul a dozen times, there are several mentions as to where to put the fluid, when to fill and how much to put in. But, no mention of "what" to put in.

Last edited by brucepalo; 06-04-2006 at 01:29 PM. Reason: forgot to answer entire reply
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Old 06-04-2006, 01:46 PM   post #5 of 14
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Default Re: what type hydrostatic oil to use

Perhaps this will help. It comes off another manufactures site but does address the dual hydrostatic transmission set-up.

"DRIVE SYSTEM
Transmission: Dual Hydrostatic
Pump Drive: 10 L Hydrogear V-Belt from Engine Crankshaft
Wheel Drive: 15 cu. in. High Torque Hydrogear Motors
Hydrostatic System Oil: 20W50 Motor Oil
Hydraulic Filter: 25 Micron, Replaceable Spin-On Type, 1 Per Pump
Pumps (2): Pump and Motor Integrated in one unit
Hydraulic Coolers (2): 7 " Cooling Fan Per Unit"

I believe that Simplicity uses Hydro-Gear's transmissions. Take a look at the actual tag on your tranny and get the mfg's name and model number off it and then Google that info -- i.e., Hydro-Gear 12345".
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Old 06-04-2006, 01:58 PM   post #6 of 14
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Default Re: what type hydrostatic oil to use

Thanks Ed! I will look for the actual tag after lunch. What might the effect be if you run 20w50 and that isn't the right stuff? Neighbor said he just runs regular 10w30 thru his, but then again he thinks dandlions are pretty.
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Old 06-04-2006, 02:04 PM   post #7 of 14
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Default Re: what type hydrostatic oil to use

Bruce, I looked on Simplicty's web site, they do use Hydro Gear on their machines. But no mention of oil type. Found a post on another forum that said to use 20-50 in Hydro Gear. I am a Cub owner so I hate to steer you wrong on something I am not 100% sure of. There should be one of the Simplicity owners here come along and let you know for sure. By the way Simplicity's site looked like every machine had hyd. filters. Sorry couldn't be more help. Mike
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Old 06-04-2006, 02:16 PM   post #8 of 14
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Default Re: what type hydrostatic oil to use

Thanks for looking Mike. I saw that on thier site as well. The exploded view manual at www.smallenginepartswarehouse.com does not show a filter either. By the way they have ton of online service manauls at thier site.
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Old 06-04-2006, 03:04 PM   post #9 of 14
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Default Re: what type hydrostatic oil to use

Thanks for the help today! I found a dealer w/ servic garage that I will call tomorrow and see what they say. I will reply to this thread with what they recommend.
Again, thanks
Bruce
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Old 06-04-2006, 04:17 PM   post #10 of 14
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Default Re: what type hydrostatic oil to use

Good deal Bruce, hope they can help.

Mike
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Old 06-05-2006, 03:37 PM   post #11 of 14
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Default Re: what type hydrostatic oil to use

Well, spoke to the dealer/service garage for simplicity mowers. They recommend and use "All Purpose Hydraulic Oil" for hydrostatic transmissions. As fas as a filter goes, they would install one and see how it runs, ZT 16 does not call for one. Thanks for the help. Bruce
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Old 06-23-2013, 11:16 PM   post #12 of 14
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Default Re: what type hydrostatic oil to use

I too have a 16 44 ZT Simplicity w/o a manual.
The parts book does show an internal filter for the hydro drives.
I see nothing on the correct oil.
BITOG ?
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Old 06-23-2013, 11:38 PM   post #13 of 14
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Default Re: what type hydrostatic oil to use

just thinking out loud here but most hydo's i see seem to take either motor oil (20W50) or ATF. what type of oil is currently in the unit? AFT will have red die. motor oil will have no die but will SMELL like motor oil. if its clear or umber color maybe its some kind of other hydraulic oil. is it thick or thin? sulfur smell or no smell?
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Old 06-24-2013, 12:19 AM   post #14 of 14
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Default Re: what type hydrostatic oil to use

The short answer is: "Simplicity Multipurpose Hydro Oil."
According to the manual
A direct substitute is " Universal Tractor Fluid"
It is made by a number of manufacturers, Valvoline, Shell, Castrol etc.
I've used that fluid in my kubotas, AC's and Simplicity garden tractors.

Last edited by skunkhome; 06-24-2013 at 12:40 AM.
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