bubbu55
Silver Member
I was wondering how often you guys change your hydraulic fluid? Shop guys told me every 500 hrs. Oil seems clean, but maybe it could go a little longer. Any thoughts? I use a 2008 CK35 HST. Thanks
Oil & Fuel Hydraulic fluid change
- Thread starter bubbu55
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JMER817
Platinum Member
Go by your manual. Mine on my JD is every 400 hrs
Mike Gibson
Silver Member
After the initial breakin oil change I don't change oil unless it gets contaminated or oxidized. New oil is very dirty compared to what's in your machine after it's been cycled through your filters many times. I was told by an hydraulics engineer its something on the order of 4K times dirtier.
Here is an interesting article.
The Seven Most Common Hydraulic Equipment Mistakes
Here is an interesting article.
The Seven Most Common Hydraulic Equipment Mistakes
VictorW
Veteran Member
For my 2004 CK30hst, the manual advises both hydraulic filters every 200 hours and fluid every 400 hours. I've been sticking to that. The oil does seem to be somewhat clean but 7 gallons of hydro fluid is cheaper than repairing the hydro drive so I do it by the manual.
newbury
Super Star Member
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Trust but verify. A Used Oil Analysis is usually a lot cheaper than 7 gallons of hydro fluid.
crabjoe
Gold Member
I don't know... a Blackstone's test is $28. You can get 5 gals of Hydro fluid for around $50. And if your test comes back saying it needs replacing, you're not out the $28 for the test.
crabjoe
Gold Member
It sounds cheap but it's not... If your fluid comes back good, how long will you go before another test or a fluid change?
Do you another 50, 100, 200 hours before another test or do you just end up changing it?
In the past, when I use to get oil analysis done on my pickup truck, I use to think it was cheaper to get the oil tested and not change it ... But the problem was that I'd get nervous about leaving the oil in to long and would end up changing it any ways.
You don't want to get to a point where when you get your analysis back, it says there's to much metal or something it in because by then, the damage is already done.
Oil analysis, at least for me, is only good at seeing if there's excessive wear, not to see if you can go longer without changing the fluid. The analysis can't tell you how much longer you have with the oil still being used. It can only tell you what condition it's in at the time of the test.
holeycow
Gold Member
I have one tractor that takes 75 litres, another that takes 95 litres, and another that takes about 80 litres (all small-ish tractors in my part of the world). I change filters occasionally. I'm not gonna change all that fluid every 400 hours. If I had a very small tractor and especially an HST little tractor I would change more often.
I changed my DK90 oil at 50 hours and 400-ish hours (by the book). I will change again soon at around 1200 hours and then probably replace only filters for many, many hours after that. My tractors barely get the fluid warm.
Do as you wish. Things change a lot when you put quite a few hours on a year and have tractors that take 500 dollars worth of fluid to change.
I also live in a dry climate with warm weather and cold weather, but not a lot of hovering around condensation temps.
I don't know a farmer here that changes their fluid every 400 hours. Filters maybe but fluid no. Nobody has much in the way of sub-90hp tractors around here. The vast majority would be gear tractors.
Works for me for many thousands of hours.
BTW, the filters are supposed to clean the oil. As long as the filters are changed occasionally it should be good, IMO. I could be wrong, but I don't think so. Generally, filters clean better when they get slightly dirty.
I changed my DK90 oil at 50 hours and 400-ish hours (by the book). I will change again soon at around 1200 hours and then probably replace only filters for many, many hours after that. My tractors barely get the fluid warm.
Do as you wish. Things change a lot when you put quite a few hours on a year and have tractors that take 500 dollars worth of fluid to change.
I also live in a dry climate with warm weather and cold weather, but not a lot of hovering around condensation temps.
I don't know a farmer here that changes their fluid every 400 hours. Filters maybe but fluid no. Nobody has much in the way of sub-90hp tractors around here. The vast majority would be gear tractors.
Works for me for many thousands of hours.
BTW, the filters are supposed to clean the oil. As long as the filters are changed occasionally it should be good, IMO. I could be wrong, but I don't think so. Generally, filters clean better when they get slightly dirty.