50 hour Hydro Oil for the non believers

[k0ua]

I;m impressed a 1980 GM would even do 160,000 miles even if towed. You have to omit that that dirty trans worked even with all that junk in it. You sure that was a TH-400??? in 82?

Sorry, 1972 not 82..

 

[murphy1244]

Sorry, 1972 not 82..

I'm even more impressed. Snow coming your way papaya boy.:laughing:

 

[k0ua]

I'm even more impressed. Snow coming your way papaya boy.:laughing:

Snow I can handle, but the ice storm scares the "papaya's and coconuts" out of me... I bought some fuel for the genny,.. here's hoping I don't need it.

 

[ritcheyvs]

On an interesting side note, I bought an old used 82 Oldsmobile once ,,, no mention of ever having changed the automatic (turbohydramatic 400) transmission fluid. ...

At one time (fairly recently), Mercedes went with sealed transmissions and no tranny oil changes for the life of the car. The life of those transmissions was something less than 100K miles, compared to 200+ K miles previously (my 300TD had 350K miles on that transmission and it was still going strong). More enterprising DIY owners found ways to change their tranny oil. Mercedes reversed that particular strategy.

 

[DarkBlack]

I don't think that's entirely true, at least not with motor oil. As I understand it, in motor oil, the molecule chains get chopped up (sheared) over time compromising viscosity. Of course, I could be misinformed.

You're both right. Why he can be "right" is that the viscocity improvers, you speak of getting chopped up( sheared) are technically " additives".

 

[DarkBlack]

No they are not useless. They are the only thing that keeps anything alive because of oil not being changed and all the crud coming from the gears and brake discs on these machines. Wonder why almost all industrial machines have separate Hyd oil and trans reservoirs. For longevity. Anyway I will almost bet the primary (Suction) filter is 10 micron and the hydrostatic filter probably is the same or a little less. All the units I build have 5 micron absolute on the suction and a 2 micron off line filtration. They last. But the 2 micron filters have to be changed frequently. By the amount of complaining about the pressure side filter being expensive I highly doubt it would get changed enough. So the mfg chose the lesser of 2 evils. A little dirtier oil than starving the hydrostat which results in almost immediate failure. So back to the begining, I plan on having this unit for more than 2000 hours so the oil got changed. Sad to say but most of these little tractors never see 2000 hours, so I guess in that case the change may not be worth it. And with that reasoning the engine oil may not need changing either? CJ

I hear you, and partially I don't. From what I know, micron ratings of filters, is an average of hole size. That being, some are larger, some are smaller. The statistics come in to play as to how many round trips a given volume of oil makes through a given filter. A 20 micron filter can trap a 5 micron dirt particle. The question is, of statistically, how many round trips will have to take to get wedged in the <5 micron hole vs passing through the larger holes. This is where I would question the purpose of a 50 hour change ( how many round trips did the dirt already do through the system in 0-50 hours ? ), vs spending the money otherwise on a filtration system that actually works. If the dirt is visible, I doubt is <20 microns.
Then again, you posted of a machine that benefited from a custom filtration system. Was the Mfg notified? Why was it only this machine? Normally filtration is on the return low pressure side, not the high side.

 

[Tractor Seabee]

I hear you, and partially I don't. From what I know, micron ratings of filters, is an average of hole size. That being, some are larger, some are smaller. The statistics come in to play as to how many round trips a given volume of oil makes through a given filter. A 20 micron filter can trap a 5 micron dirt particle. The question is, of statistically, how many round trips will have to take to get wedged in the <5 micron hole vs passing through the larger holes. This is where I would question the purpose of a 50 hour change ( how many round trips did the dirt already do through the system in 0-50 hours ? ), vs spending the money otherwise on a filtration system that actually works. If the dirt is visible, I doubt is <20 microns.
Then again, you posted of a machine that benefited from a custom filtration system. Was the Mfg notified? Why was it only this machine? Normally filtration is on the return low pressure side, not the high side.

My Kubota has the filter on the pump discharge side (full flow of fluid) and a strainer on the suction side. The only protection for the gear pump (very close tolerances) is that coarse STRAINER. Everything downstream of the pump is protected by the spin off FILTER. As we all probably or maybe should know is that once a filter gets coated the pressure (3100 PSI relief valve setting) causes the flow constrict to a narrow pathway defeating the large filtering surface intended by the cartridge. This increases the velocity of the fluid enabling it to carry particles and cut through the path instead of dropping out at the low velocity clean media. NUFF SAID about the mechanics/physics of strainer/filter engineering.

Ron

 

[DarkBlack]

NUFF SAID about the mechanics/physics of strainer/filter engineering. Ron

I guess there's no point in trying to have an intelligent discussions on the net.
You obviously know it all already... from your kubota. Feel free to not read/ respond to my posts.

 

[CJONE]

Without this going too far. Check with just about every top drive drilling system in the oilfield and ground drive system on harvesters and sprayers for farming and you WILL find high pressure filtration in the high pressure loop. You will not find return filtration. Again like I have stated before a hydrostatic system is nothing like a gear or vane system most are used to. The last system I designed was over 40,000 dollars without the prime mover. If these systems did not work the customers would not come back. A good friend has been doing this for 30+ years, I have only been doing this for 17. He has thought me not to argue with people, let them do what they want and after it fails they will be back. And he is right. Last summer a customer destroyed one of my hydrostats in his yard on start up because of not listening about his $50 suction filter. I gladly fixed it for him and charged him again. CJ

 

[DarkBlack]

I admit I mis-posted wording as if hydraulic systems are always return/sump filtered.
My other points/questions still remain. It seems you advocate added/modified filtration systems