Hitachi ZX120 Hydraulic Pump Rebuild Kit ZX12T-PIMPKIT

This high-precision heavy-duty hydraulic main pump core overhaul and repair kit assembly (Original Excavator Pump Kit), with Hitachi original core part number ZX12T-PIMPKIT, is perfectly compatible with the exchange optimization codes ZX12T-PIMPKIT-1 and ZX13T-5APUMPKIT, and has perfect platform level seamless interchangeability between generations. This high-end original grade pump core repair component is specially designed for deep matching of Hitachi's high standard medium-sized hydraulic excavators, and is precisely suitable for restoring the main pump power of 12 to 13 ton industry absolute core star models such as Hitachi ZX120, ZX120-3, ZX120-5A, and ZX130-5A. The product is based on first principles and perfectly integrates core rotating friction pairs including cylinder body, plunger, distribution plate, and high-pressure oil seal, ensuring absolute certainty of physical damping and volumetric efficiency in pumping. The physical dimensions of the product packaging are approximately 340mm × 240mm × 180mm, with an overall net weight of approximately 14.5kg.

"Dust free assembly and torque fastening (core pit avoidance): The assembly environment for major repairs must meet dust-free purification standards. All friction surfaces (plunger, port plate, cylinder surface) must be coated with clean hydraulic oil as initial lubrication during assembly. All high-strength fastening bolts must be tightened using precision torque wrenches, strictly following the original factory torque standards for symmetrical and phased cross tightening, to prevent micro stress deformation from causing jamming.

Forced oil filling and turning: After the main pump is lifted in place and the pipeline connection is completed, clean new hydraulic oil must be filled from the top oil filling/bleeding port of the main pump and manually turned several times before starting the engine for the first time. It is strictly prohibited to start dry grinding, otherwise the internal rotating components will undergo irreversible physical erosion within 3 seconds of ignition."