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#1
10-22-2020, 12:44 PM
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Accidentally added a few ounces of JD hygard fluid to 129 engine...any problem?
Grabbed the wrong container. From what I'm reading, it shouldn't be a problem (?) I'd say at most I added 2 ounces of Deere hygard (transmission / hydraulic) fluid with the intention of just topping off the oil on the dipstick. I use SAE 30 in the 129. It's not time to change the oil, so ok to just let it go till the end of the mowing season? Interestingly, I came across some comments indicating that back in the day, prior to oil detergents being as good as they are now, people would add a quart of trans fluid to the motor oil once a year just prior to an oil change to help clean out the engine (?).
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#2
10-22-2020, 01:03 PM
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That's an interesting thing to put into engine oil... certainly not something I've ever heard of. I can't imagine it would do much if any damage to the engine, at least not a couple ounces. Even so, don't think it's something I would do personally.
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 '70 107 with k301 engine swap '71 106 with 38" deck '70 147R with factory replacement k321, 42" deck '61 Original with 38" timed deck '63 70 "pinkie" 1863 with 54" deck '46 Farmall H, '50 Farmall Cub 105 x2 (parts)
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#3
10-22-2020, 02:50 PM
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Quote:
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#4
10-22-2020, 02:57 PM
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I would not do it on a regular basis nor to "clean" my engine but I think you are gonna be fine.
if we want to do the math...have at it but there are plenty of online viscosity calculators to do it for you - for simplicity lets say the engine has a 1 quart capacity and you added 2 ounces of hydraulic fluid. approximately 6-7% the SAE30 at 40C approximate viscosity is 100 cSt the JD Hydro oil worst case about the viscosity of ATF 40C 35-40 cSt the mixture would be lowered to about 95 cSt which is still within the tolerance for SAE30 at 100C Operating temp it is a similar story - assuming again your SAE 30 starts in the middle of the viscosity range (9.3cSt - 12.3cSt) say 11.6. with this mixture rate you will drop to around 11.2 once again well within range of the standard SAE...The hydro oil may have a lower flash point since it is not designed for a combustion engine - it is possible that the oil level will drop some during engine running due to the hydro oil for lack of a better term, boiling out when you change your oil you are mixing oils anyway. you never get all the oil out on a drain, plus what is clinging to the inner walls of the engine.
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#6
10-22-2020, 07:24 PM
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Quote:
That said, Back in my day we didn't have detergent oils or they were not common. Sooooo we did indeed put in a qt. of ATF to " clean up the inners of engines" Never hurt anything then. Now as far a adding JD hyguard,------- since it is as good of a hydraulic oil that is made, and you only used a few ounces, nothing bad will happen. BUT,---------- I would make sure your tractor is in a shed or garage as it is Deere mating season and you would not want hoof marks on the seat or hood. Might be difficult to explain to the woman/children.  Also hard to steer/sell a Tractor with ag's on the read and hoofs on the front. 
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#7
10-22-2020, 09:00 PM
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Thanks for replies! I have no intention of adding more hytran to the cub. As I said, simply grabbed the wrong container.
George....you're right. I would not care to leave the Deere outside only to find a-ruttin' goin on next day. Probably be worth a youtube video though. I must say, my JD X-590 and Cub 129 get along quite well in the garage...who knew??? 
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