Why is clipper over heating

All clippers run hot. Motor is enclosed, gearbox and friction all add to the heat.

normal for clippers if the hair is long or thick
oiling is done with the clipper running
Change over from steel clipper blades to ceramic blades as they run cooler and stay sharper for longer
just place a small drop on the blades and let it work down
AS for others
make sure that the filter in the handle is clear of hair and the same for the vent under the hand
Other than that you can take out the 4 screws and put a small amout of oster grease around the wheel and drive pinion as it can get out and run dry
go to the manufacturing web page and download the pdf version manual

If both heater hoses are getting hot after 10 min of run time, the problem could be a stuck blend door under the dash.

Start with a new coil and plug wires, along with plugs.

You should contact Authorized Service.

Behind your harmonic balancer there is a cranshaft position sensor. When its getting hot its loosing calibration. Have that checked out.

if you have no any hardware store in your area then you replace other screw from handle and handle welding by flame

Buy some Kool Lube (Oster) or Andis Blade Coolant. Both are aerosols. Your 2-speed runs faster, so your blades heat up quicker. Check them often by touching them to your inner wrist, and spray them when they are hot. A bonus is that the sprays also disinfect! (FYI a hot blade can badly burn a pet, so make sure you keep them cool)

You may have a problem with a temperature safety system.  Before changing anything else, check to see if the unit is clean!!!  Dirt/dust can fool the safety system into an overtemperature status.  Inspect the heat coils for damage and dirt.  Gently clean.  

have a ariston euro combi boiler ,the problem to get hot water i have to turn the heating on to get hot water. but now it only run for a few min then run cold please help