Combines R 52 hydro oil getting hot

I had the same problem with a R50. I found the best way was to use a garden hose a lots of water and be sure to soak it up good. You may let it set for a while and soak, and then go back with a hose to soak it down some more. I then alternate with a water hose and an air hose to blow it out. This will clean it out without any damage to the cooler.

We have actually used small mig wire to carefuly poke out the coolers - but be careful. As stated above soak and pressure wash - the cooler is pretty tough just don't hit it at an angle other than 90 degrees with the stream. Also be sure to check the current to the master valve. Some times the auto header control malfunctions and sends 8 v or so to the coil. This can overheat the system. Also the orings on the relief valves of the forward and reverse section of the hydro can cause a problem as they get hard and let oil bypass(can't answer as to the theory here - but it fixed one issue).

I had a R50 that has same small inline 6 Deutz as you have. The hydralic cooler has a thermostat in it that needs to be locked in proper position to prevent oil from bypassing cooler. This machine we had trouble with oil heating had the thermostat locked only part way which allowed oil to get hot. Hadn't seen any since but something to keep in mind.