"Don't change Hydro oil at 50 hrs" says Dealer

HarleyBob · Aug 17, 2001

Re: "Don\'t change Hydro oil at 50 hrs" says Dealer

Looks like I made a good initial post if getting everyone excited counts. So now that I have decided to
change the hst oil. What should I use? I would like the short answer as I am confused greatly
by searching all the hundreds of messages on UDT vs Super vs Nappa vs Mobil etc.
I will be buying 12 gallons so I would prefer not paying $300.00 for the oil.

ronjhall · Aug 17, 2001

Re: "Don\'t change Hydro oil at 50 hrs" says Dealer

Bob
Super UDT . /w3tcompact/icons/cool.gif/w3tcompact/icons/smile.gif Super UDT . /w3tcompact/icons/cool.gif/w3tcompact/icons/smile.gif Hope this is short enough. /w3tcompact/icons/wink.gif/w3tcompact/icons/smile.gif

Wheeldog · Aug 17, 2001

Re: \"Don\'t change Hydro oil at 50 hrs\" says Dealer

Del,

I've read a good number of your posts in the past, but I don't remember where you are from. Just wondering what the coldest temperatures that your tractor (with UDT) has seen (is it the 50-60 degrees F?)

Rob

r0GuE · Aug 17, 2001

Re: \"Don\'t change Hydro oil at 50 hrs\" says Dealer

Super UDT

Rogue

JRP · Aug 17, 2001

Re: \"Don\'t change Hydro oil at 50 hrs\" says Dealer

I am a reliability specialist for a major chemical company. We run a 9000 hp gearbox 24 hours a day, and change the 300 gallons of oil once a year. (8600 hours) We do have electrostatic oil filters, precise oil temp control, and monthly oil sampling, however.

My new M6800 Kubota gearbox is way noisey compared to the smaller gearboxes where I work. We would pull and rebuild if one sounded like mine. Kubota must have to cut manufacturing costs to keep the tractor price reasonable. With this in mind, and because I don't know what type of assembly lubricants / break-in agents, etc. that are used during assembly , I think changing the trans oil at 50 hours is a good idea.

I plan to run the heck out of my M6800 and get things warm and as stirred up as possible just before I pull the plug to get the particulate material suspended. I will change from UDT to Penzoil Hydra-Tranz because Kubota parts are way expensive. One gear in my front wheel drive is $750, the other $250. UDT is probably a high profit margin item.

The old UDT will go in our leaker FORD 3930 power steering.

HarleyBob · Aug 17, 2001

Re: \"Don\'t change Hydro oil at 50 hrs\" says Dealer

I wish I had a secondary use for the 10 gallons of hydro oil I am going to have recycled.
Is there a standard that Kubota Super UDT matches that allows you to compare it to
other products by Penzoil and others? One issue is that I would rather buy from my local
auto store as they will take the used oil back and the Kubota dealer is much less convenient to deal
with (four hours roundtrip).

Anonymous Poster · Aug 17, 2001

Re: \"Don\'t change Hydro oil at 50 hrs\" says Dealer

Kubota does have standards for hydraulic fluid. When I called Mobil technical center in the spring of 2001 to ask if they had a synthetic hydraulic fluid that met Kubota Super UDT criteria, the representative said that they did not have a fluid that was "qualified" to that standard. He used that specific word. Mobil does have a hydraulic fluid that meets UDT (no Super prefix) criteria. The fact that Mobil has not qualified a fluid to Super UDT criteria may mean either that their best fluid will not meet the criteria or, alternatively, that they have simply not done the necessary laboratory work to verify compliance. However, Chevron does, apparently, have a synthetic hydraulic fluid that is stated to meet Super UDT criteria. The name is Chevron Synthetic All-Weather THF. The stock number my Chevron dealer ordered is SN255237P. I paid $8.58 per gallon for a five gallon pail. One thing to note. The full spec sheet on the fluid explicitly lists it as being a Super UDT replacement. However, the 2000-2001 Product Salesfax Digest only shows it as meeting UDT criteria. My take is that it truly meets Super UDT criteria and that the shorter Salesfax listing is incomplete. However, I do not have definitive proof of this.

Anonymous Poster · Aug 17, 2001

Re: \"Don\'t change Hydro oil at 50 hrs\" says Dealer

Western Washington.

Tractor is garaged, Ford has been out in the 40's, Kubota's haven't, yet. When it get's below 40 I'm not much interested in sitting on one of them. Talk about increasing profit margins...(for oil)...you can order a heated seat in a Chev Tahoe, Jeep etc, how about a heated tractor seat! Far more useful then a heated seat in a closed car with a heater!
del

Anonymous Poster · Aug 17, 2001

Re: \"Don\'t change Hydro oil at 50 hrs\" says Dealer

I just changed the THF in my used L4310 HST after 400 hours on this oil change. The old oil looked crystal clear. But after many years of using synthetics in my cars, I switched to the Chevron synthetic THF. The best price I could get here in NJ was $67/5gallons. The only other synthetic that I know of is Amsoil but that runs $83/5 gallons and is not super UDT compatible (just UDT).
I just bought this tractor but know the original owner. I'll probably put many years of use on this tractor and oil is way cheaper than parts and labor. Just one hour ago I dumped all 10 gallons of used super UDT into the oil recycle tank at the local gas station.

GlueGuy · Aug 17, 2001

Re: \"Don\'t change Hydro oil at 50 hrs\" says Dealer

I looked at the manual, and the 50 hour service says to change the hydraulic fluid, but not the filters or even clean the screens. We just did it the other way around (changed filters, but not the oil).

Seems to me that if you're going to change the oil, it makes sense to change the filters too.

Likewise, the service interval table shows changing the filter every-other-time. I don't buy this philosophy. If I change the oil, I change the filter too.

The GlueGuy