MAINTENANCE PROCEDURE MAINTENANCE CHECK BEFORE STARTING 0. For details of the following items, see "Checks Before Starting ( 3-33 )" in the OPERATION section. Cooling System Coolant Level - Check/Add Engine Crankcase Oil Level - Check/Add Fuel Level - Check/Refill Hydraulic Oil Level - Check/Add Air Cleaner Dust Indicator - Check Water Separator - Check Electric Wiring - Inspect Horn Function - Check 4-42