After about an hour of mowing my hydraulic fluid is blowing out of the cap. If I had to guess, I would say it is hotter than normal. Mower has 160 hours on it and I am planning to replace the hyd filter thinking it may be clogging and putting pressure on the pump. But I'm interested if anyone has had this problem before...it takes about 30-60 minutes before fluid starts coming out and has happened the last two times I've used the mower. When I start the fluid level is at the cold level where it should be. When I am done enough fluid has escaped (big mess !) that it is at the cold level though it should be at the hot level obviously.