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APQD APQD-514 MATERIAL 003

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INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
TYPE OF HYDRAULIC PUMPS . . . . . . . . . . . . . . . . . . . . . . . . . 2
STRUCTURE AND FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . 4
MAIN CAUSES OF FAILURE . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
JUDGEMENT ABOUT FAILURE . . . . . . . . . . . . . . . . . . . . . . . . 7
LEVEL OF FAILURE AND JUDGEMENT ON REUSE . . . . . . . 9
• Judgement standards for reuse
EXAMPLES OF FAILURES . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
• Drive shaft
• Cylinder block
• Valve plate
• Cradle
• Rocker cam
• Piston sub ass’y
PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . 33
FORM NO. SEBG4140
Printed in Japan
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