The Structure and Function of Hydraulic Gear Pumps

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
FAILURE SIGNS AND DIAGNOSIS FOR REUSE . . . . . . . . . . . 2
• Inspection Points for Parts Reuse Diagnosis
• Standards for Failure Determination
• Standards for Reuse of Hydraulic Gear Pump Parts
EXAMPLES OF FAILURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
• Gear Cases
• Brackets and Housings
• Gears
• Splines
• Needle Bearings
• Plain Bearings
• Bushings
• Side Plates
• Pump Case Bracket
STRUCTURE AND FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . 28
• Functions
• Types of Komatsu Standard Pumps
• Structure of Komatsu Standard Pumps
FAILURES AND THEIR CAUSES . . . . . . . . . . . . . . . . . . . . . . 35
PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . 36
• Prevention of Recurrence
• Precautions for Assembling a Pump




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