YNF16871 1020401 Head HPV050 Hydraulic Pump Rear Cover for Hitachi EX100-5 EX120-5

The YNF16871 rear cover, replacing OEM 1020401, is the back housing component of the HPV050 hydraulic pump used in Hitachi EX100-5 and EX120-5 excavators. As an essential structural part of the pump assembly, the rear cover supports internal rotating components, maintains alignment, and ensures proper sealing under high hydraulic pressure. A damaged or warped rear cover can lead to oil leakage, vibration, reduced pressure, and premature pump failure.

Manufactured using high-strength cast material, the YNF16871 rear head is engineered with precision-machined surfaces to achieve excellent sealing and fitment accuracy. It withstands long working hours, heavy vibration, and harsh excavation environments commonly encountered by construction and mining equipment.

Widely used by pump rebuilders, repair shops, and aftermarket distributors, this rear cover provides an OEM-level solution for complete pump overhauls. Replacing the rear cover restores structural integrity and improves hydraulic pump efficiency.