. MAINTENANCE SERVICE PROCEDURE SERVICE PROCEDURE 4 - 23 INITIAL 250 HOURS SERVICE (ONLY AFTER THE FIRST 250 HOURS) Perform th e following maintenance onl y after the first 250 hours. Replace transmission valve oil filter element Change oil in transmission case, brake sub ta Replace transmission and r ear brak e cooling oil filter element Replace steering, hoist oil t ank filter Change oil in final driv e cas Change oil in differenti Change oil in steering, hois t oil tank For details of method of r eplacin g or m aintainin "EVERY (PAGE 4-63)", "EVERY 1000 HOURS SERVICE (PAGE 4-73)" , "EVERY 2000 HOURS SERVICE (PAGE 4-82)", "EVERY 4000 HOURS SERVICE (PAGE 4-86)".