GROUP 1 BEFORE TROUBLESHOOTING GROUP 1 BEFORE TROUBLESHOOTING 1. INTRODUCTION 1. INTRODUCTION When a trouble is occurred in the machine, this section will help an operator to maintain the machine with easy. The trouble of machine is parted Hydraulic & Mechanical system and Electrical system system. At each system part, an operator can check the machine according to the troubleshooting process diagram. Hydraulic & Mechanical part GROUP 2 Troubles occur GROUP 3 Electrical part 5-1