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In this video, we dive deep into the failure analysis and repair of a Nachi Twin Discharge Variable Displacement Piston Pump from a Hitachi EX40 Excavator. Learn how this crucial hydraulic component works, what caused the failure, and how to repair and overhaul the piston pump using new parts, including the drive shaft, bearings, rotating group (barrel and pistons), hardened steel swash plate, and bronze alloy valve plate.
🔧 Video Highlights:
● Cause of the pump failure and damage assessment
● How variable displacement piston pumps operate
● Step-by-step assembly and repair procedure
● Twin discharge barrel explanation
⏲ Time Stamps:
● 0:00 Introduction
● 0:45 Cause of Damage
● 2:00 Displacement Change Explained
● 2:55 Twin Discharge Barrel Explained
● 5:05 Assembly Time-Lapse
● 10:20 Final Assembly

For more on suction and pressure generation in piston pumps, watch:
   • Swash Plate Piston Pump (axial flow v...  

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During a field test, we found the pump’s output ports only generated 10 and 15 liters per minute, respectively, and couldn’t exceed 500 PSI. After removal, we discovered a broken piston that caused extensive damage to the pump’s internal components.

Equipment Links:
Variable Displacement Piston Pump for Hitachi EX40 Excavator:
eBay USA : http://ebay.us/9YaVsr | Amazon USA : https://amzn.to/2IFxzrp
Camera Used: Nikon B700 : http://ebay.us/ZcPlhT

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