Hydraulic temperature

Bkpigs

Member
Got done mowing some bad hay with a Farmall 300 and finish mower and decided to measure the temp of the hydraulic lines. They read 160 degrees. Is that ok?
 
I agree even 230 is OK in that it really gets rid of water. But that would be found on a hot day using the hydraulics continually. Jim
 
thats quite normal, but anything over 180 is already getting to hot. running a hyd. system hot is hard on the o rings as they
get brittle and then you have leaks.
 
Motor case drain temperatures in heavy-duty hydrostatic systems will typically run well above 200 F and standard nitrile (Buna-N) o-rings are fine at this level. The most important thing is to always replace the o-rings when re-assembling something because they do take a set and won't seal well the second time around.
 
yes, our units have shutdowns on them once the temp. gets up there to around 200 degrees. also have big oil cooling rads. with auto start fans.
 
Yes once those "O" rings take a set you are toast. Never reuse them. I know HF has sae and metric assortments and they are not too expensive. I know real American made rings would be nice but good luck finding them. Down at work all of the food pump systems have rings in them and I change them every time.
 
Little off subject here, but original Farmall 560's hydraulic return tube threw the oil right up under the rear housing cover. Well, it got pretty darn hot on one's feet and drew a lot of complaints. They graduated to three different style return tubes, until final one made a loop, sprayed pinion bearing and bull pinion bearings. Had to drill holes in bull pinion housings when installing tube and it was one of the latest improvements that was not in the original final drive improvement package. Did a bunch of them also.
 

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