Hydraulic Oil Temp

[buzzsaw07]

I have a MF 1734e with FEL. I never payed much attention on how hot the connection got at the loader valve. I noticed the connections and valve body were about as hot as a cup of hot coffee. I do not have a thermometer to get a temp. You can hold on to the connections but not for an extended length of time. Is this too hot? I see that the temp should not be above 180 degrees and some post say 100 degrees plus the ambient air temp.

 

[Agvg]

If you can touch it it's not to hot.

 

[buzzsaw07]

Thanks

 

[Tx Jim]

Normal operating temp for hyd oil is around 100° + ambient temp.

 

[buzzsaw07]

Thank You

 

[oosik]

I don't know about my tractor. Don't have a thermometer that reads that high. The Taco Wagon has digital dashboard display for just about every fluid in the truck. The other day - 300 mile run on I-90. Tranny oil temp - 157F. Coolant temp - 210F. Engine oil temp - 182F.

 

[IceStationZebra]

There is some conflicting information on the matter, which may be due to the additives in the oil, but generally experts say that conventional oil has a life of ~10,000hrs at 140°F/60°C and every 18°F/10°C rise above that cuts the life in half. This of course assumes the limiting factor is oxidation and not a contaminate like dirt or water.
158°F ≥ 5000 hrs
176°F ≥ 2500 hrs
194°F ≥ 1250 hrs

Vickers Mobile Hydraulics Manual, page 372, section 'Heat or thermal contamination': "Their useful life, as well as maintenance of viscosity, chemistry and the other attributes is based upon continuous operation below a critical temperature. This critical temperature is 140°F. Every 18°F increment higher than 140°F effectively doubles the oxidation rate of the hydraulic fluid (petroleum based) thus cutting its useful life in half, e.g. running a system at a consistent 176°F would reduce the useful life of the fluid by 75%."

Oil Hydraulic Systems, by S.R. Majumdar: "As a working rule oxidation rate is doubled for each 10°C/18°F rise in the temperature. An oxidation-inhibited high viscosity index (HVI) oil may give a useful life of ~100,000 hours at 40°C/104°F even under the condition of aeration and catalysis. When the oil temperature is raised to 60°C/140°F, life drops to as low as 10,000 hours."

Synthetic oil doesn't start to break to till at least 170°F or higher depending on the base stock and additives

Hoses and other rubber components are generally good till at least 212°F/100°C depending on the compound. But similar to oil, the hotter they run the shorter the life.

ISZ