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How hot is OK?

R

Russ from MN

Well-known Member
Location
Bemidji MN
When we get done mowing our yard with our JD Z-turn we always blow it off with our leaf blower, I was reading the owners manual and it said to checK the hydrostatic drive cooling fans. They seemed fine, but I notice the units were pretty hot. I got my heat gun and they were 153 and 155F, is that OK?
 
That is o.k. For instance, most car engines run at about 212 degrees F. or above. Actually it sounds like the fans are doing their jobs.

If it was like 300 degrees, I might then begin to worry.
 
I think dino fluids start breaking down above 250F. Synthetics are more like 400F. Don't remember the references and the info. is numerous years old. My 2011 Silverado runs 210 and only once saw it over that and it wasn't more than a needle width....has 2 electric fans, sensor controlled. My tranny has the OEM cooler in front of the AC condenser and never saw it over 175.....engine is a dash gauge and tranny is via the dash function selector...where miles to fill up, odometer and all that stuff is located.
 
I use wallyworld 10w-30 syn. in my lawn mowers as it lasts a season or more whereby dino oil needs changing at least a couple of times a year. Just for a data point, I was mowing one summer afternoon, working the ZT really hard and got out the non contact and max temp was 187 on the 22 HP BS V twin oil sump sidewall and muffler was running 550.

Given what I said above, makes me wonder if the 250 max rating for dino was vendor specific, not an across the board number.
 
150-165 F is normal on a hydraulic system.

If it gets up into the 350 range. Hydraulic oil breaks down. And you will know it for you will have some damaged parts.
 
The recommended loop temperature of large hydrostatic systems (like on a windrower or similar machine) is typically in the 140 to 180 F range and I wouldn't expect small hydros would be much different. So, what you're measuring would be considered perfectly normal. A lot of folks try to gauge the temp of their hydraulic system by what it feels like to the hand but in reality even relatively cool hydraulic oil will cause the system components to feel extremely hot to the touch.
 
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