hydraulic oil overheating

1. #1cosmaar12023-09-24 21:47

   If it has a cooler, maybe it’s plugged?

2. #2mg23612023-09-25 05:24

   As stated above, is the cooling package completely clear? Seals/baffles in place? Is the engine temperature climbing? Do you have the reversing fan option? Please provide the complete machine serial number.

3. #3Osat2023-09-25 10:46

   333D 1T0333DMTCD232318 , revering fan option Engine coolant staying around 176 with hydraulic at 206 Hydraulic oil starts at 152 and climbs to 206 - 210 before I shut down wait for cooling time which takes about 10 mins or so . Restart at around 195 and climbs back to 206 in about 15 mins using rotary mower.

4. #4mg23612023-09-25 11:59

   Cooling package cleanliness?

5. #5Osat2023-09-25 15:17

   Yes , aluminum oil cooler appears visionally clean ( front and rear) , and has been blown thru on regular basis

6. #6ozarkag2023-09-25 19:47

   MG, is 210 overtemp on hydraulic? Osat, is it coding and derating?

7. #7Osat2023-09-25 20:10

   last work on Sunday , temp reached 210-212 without coding or derating when temp reaches 210 or so , machine is shut down for cooling to around 195 before starting back up to finish the job

8. #8mg23612023-09-26 05:04

   While it is not published in the "D" manuals, the "E" series manual states that the derate of the hydraulics begins at 230*. High flow machines that run rotary cutters or planers will run hotter, especially on hot days, but should not reach derate. Usually the issue is either some plugging of the cooling package (there could be fine dust collecting in the fins that is hard to see and the cooler may look visually clear), or a fan speed issue is developing. Has the temperature been confirmed with an infra-red temperature gun?

9. #9Vetech632023-09-26 07:56

   How about running it long enough to see if it hits that derate temp? You could be assuming its hot enough to need cooled when the system is telling you it's not.

10. #10Nige2023-09-26 11:21

    I second that. On a lot of machines it's not unusual to see implement hydraulic temperature over 100 DegC (212 DegF). Additionally the higher the system temperature the more heat transfer there is from the cooling package to the atmosphere so there may be a balance point at a temperature lower than the alarm/derate point that you haven't found yet. Also I'd second MG's suggestion of confirming actual temperatures with an infra-red temp gun.

11. #11Osat2023-09-27 11:21

    Oil temp at 210 , I/R gun shows appx same on hydraulic motor on rotary cutter and on 333d hoses from cutter to 333D and other oil lines on machine I has derated before , until we stopped running up to higher temps , hoping to avoid additional damage

12. #12mg23612023-09-27 12:33

    You sure the cooler is absolutely clean with no gaps in the seals where it mounts? At the moment, I do not suspect fan speed because your engine temp stays at 176*. But we may circle back to that. Also, has the rotary cutter been checked for excessive leakage? Maybe there is an internal leak to case drain driving the hydraulic oil temp up. May need to check the machines relief settings.

13. #13Osat2023-09-27 14:05

    We will remove rotary cutter and install mulcher ( high flow also ) and do some site work and see if the oil temps are the same results

14. #14mg23612023-12-23 06:32

    I would like to see the fan speed checked with a photo tach. It will need to be at operating temperature with the fan solenoid or temp sensor unplugged (to put the fan at maximum speed). Record the fan speed at fast idle and post.

15. #15Welder Dave2023-12-24 02:33

    I always thought around 200 deg's. was OK as long as it didn't climb up much higher. If it's staying below the mentioned 230 deg's. at 206 deg's. does it stay there or keep climbing rapidly? If you're stopping at 206 as a precaution maybe you don't need to? What about adding an additional cooler, maybe with a 12 volt fan?