. MAINTENANCE SERVICE PROCEDURE SERVICE PROCEDURE 4 - 17 INITIAL 250 HOURS SERVICE Perform the following maintenance o nly after t he f irst 250 hours. CHANG E TRANSMISSION OIL F ILTER CARTRIDGE Replace hydraulic t ank filter For details of the method of replacin g or maintaining, see the section on EVERY 1000 HOURS and 2000 HOURS SERVICE. INITIAL 1000 HOURS SERVIC Carry out th e following maintenance onl y after the firs t 1000 hours. Check e ngine valve clearance, ad just For details of the method of replacin g or maintaining, see the section on EVERY 2000 HOURS SERVICE.