- 31 -Overheating occurs frequently. Is the quantity of coolingwater as specified?Are the radiation fins of theradiator free from clogging?Is the cooling fanrotating normally?Water supply/replenishment The volume of water is approx. 11L.Use preservative together.Exercise care so as not to damagethe radiation fins during cleaning.Refer to the wiring diagram and hydraulic circuit.Step control changeover switch is abovethe electric equipment box in LH side cover.Plug-in fuse 50A . Mini-blade type fuse 5A .Mini-blade type fuse 20AElectric cylinder clamp . Cylinder mountingshaft . Step mounting base shaft ass’yChangeover switch wiringCleaningInspection of hydraulicand electrical pages.Failure of engine(Failure of pump)(Failure of water temperatesensor)Change to “AUTO”.Replacement of fuse.Replacement by normal parts.Replacement of switch.Breakage of bearingFailure of electric cylinderDefective connection of wiringIs the control switchin the “AUTO” position?The step will not swingon a slope.Is the fuse normal?Is the step/electric cylindersupport shaft normal?Is manual operation possible?YESYESYESNOYESYESYESYESRefer to the engine operation manual.Bearing 60062RS100 electric cylinder 303Refer to the wiring diagram.NONONONONONO23-4. Overheating23-5. Step trouble- -29