Temp on hydro oil in the summer

My vehicle runs at 190-200 deg coolant temp but I bet the engine oil is as hot or hotter and no damage occurs.

 

I know engine oil gets hot enough to evaporate the water off but I just assumed engine oil seals and such were different than hydro oil?? But a seal is a seal used in similar applications are the same.??

But I did think the same thing. I bet my engine oil here in the smer is probably 135 maybe 10 minutes after idle.

 

I maintain gas turbines that run 8k gal reservoirs coolers attempt to maintain 130 supply, creeps to mid 140's on hot days (when the machines are normally running)
The same oil is used as hydraulic and bearing lift fluid return temps off bearings see 200-230
We sample oil every 3months - no failure issues from oil 12 years and counting - Terrestic GT32
Servos on the other hand do not like varnish, but I developed a tracker to monitor command vs. feedback and they get replaced before it becomes a large expense...

 

A lot of heat issues have to do with the plumbing of the hydro lines on the splitters, 90 deg fittings that are very restrictive internally , poorly located return ports, Hard lines that are only 3/8 internal in what is supposed to be 1/2" system. All of these add up quickly. My own HF unit suffered from all these problems, originally would get so hot after about an hour run time you could not touch cylinder with out getting 2nd deg. burn at minimum. Correcting all this at a time of rebuild a few years back you can now run it all day in 90 deg weather without overheating anything. In 90deg temps it will get hot enough that you do not want hold your hand on cylinder but you will not get burned. split a minimum of 10 cord a year. last 3 years are closer to 20 + cord. 10 cord and counting since Aug 10th this year same cylinder pump coupling and brigs motor since new about 13 years ago.

 

True. Most wear actually somes from the finer particles, stuff small enough that it tends to recirculate.

Yeah a seal is not just a seal. Changes in material alone complicate the issue. Add in changes in lip geometry and things get interesting. Engine oils do run at a higher temperature than hydraulic systems. THat combined with soot and acid loading contributes to much shorter drain intervals.

I imagine your exxon mobil product is running about $800-1000 a drum? Even though it is a dino oil I imagine it is highly refined and the additives package is spec'd to deal with the conditions unique to turbine applications.

I am a little surprised on your sampling intervals, I figured yall would run on a monthly program. Having pretty good success with it? What are you guys running for vib monitoring route intervals?

 

All I can say is there was a site I visited to help out on some issues, noticed they had a low level switch in from 10yrs of weeps/drips, they were rather shocked when I submitted a requisition for 8 barrels to get them even, $1100/55gal IIRC - that was over 8 yrs ago.
oil sampling quarterly seems fine, we run Hypro charged particle reservoir filters continuously - those filters aren't cheap, 1800/each x2 per unit.
Vibe analysis, 6month interval on auxiliary rotating equipment - and honestly I would have cut it from the budget, it never finds anything - you can hear a pump/motor bearing well before the reports get you any data. In reality you are going to change out something that you know is decent=same cost as running until you can hear it getting ready to fail. We have redundant spares of all equipment, except the 10hp motor that turns the turbine at 6rpm - we just replace/rebuild that every 5 yrs, costs a lot of money when a 110,000lb hot rotor comes to rest