Hi its Kenny from PA. Yes all drain plugs should be painted orange actually that to make sure they were tightened at the factory and as the check them and they paint them orange and sometimes they could be white, usually some of the adjustment will be white. Also remember there are 2 drain plugs on the engine oil pan the drive shaft goes through the middle. There is one fill plug for the rear and the transmission, if you have a clutch there is a water drain plug that should be taken out and drain any water that could be the clutch housing. this water could get in from washing the tractor.
I have had Kioti for 14 years now and they are good machines. Have a ck25 w cab and a ck2510 had a CS2410 traded on the CK2510.
Need any more unwanted advice just ask. Kenny