. FOREWORD CONTENTS 20 34 35 36 49 56 63 71 73 73 1 2 1 1 - 12 WHEN CHECK BEFORE STARTING EVERY 50 H OURS S ERVICE EVERY 250 HOURS SERVICE EVERY 500 HOURS SERVICE EVERY 1000 HOURS SERVICE EVERY 2000 HOURS SERVICE EVERY 4000 HOURS SERVICE EVERY 6000 HOURS SERVICE EVERY 8000 HOURS SERVICE SPECIFICATION SPECIFICATIONS INDEX 4 - 4 - 4 - 4 - 4 - 4 - 4 - 4 - 4 - 4 - 5 - 5 - 6 -