CAT390D Hydraulic Main Pump for Caterpillar CAT390D 90‑ton Large Mining Heavy‑Duty Excavator spare parts

Short Description:

The Caterpillar CAT390D hydraulic main pump is an original large‑displacement electronic‑regulated dual‑variable piston pump, the core hydraulic power source matched for CAT390D 90‑ton large mining excavator. Precisely calibrated for Caterpillar’s electronic positive‑flow hydraulic system, it perfectly matches the power‑torque characteristics of the CAT390D C18 engine, converting mechanical rotational power into ultra‑high‑pressure hydraulic energy. It supplies large‑flow pressurized oil for boom, arm, bucket, travel and swing hydraulic actuators. Optimized for open‑pit mining, hard rock ripping, heavy‑duty bulk material loading and large‑scale earth‑moving transfer conditions, this main pump delivers powerful hydraulic output, rapid electronic response and stable power‑limit adjustment, adapting to long‑time continuous heavy‑intensity mining construction scenarios.

Product Detail

Product Tags

description

Genuine Caterpillar CAT390D main pump adopts heavy‑duty dual‑piston variable displacement structure, equipped with electronic proportional regulator, power‑limit control valve assembly, LS load‑sensing valve, servo piston assembly and built‑in charge pump. Driven by engine output power, the pump adjusts displacement in real‑time according to electronic control signals and load feedback to realize intelligent power matching between engine and hydraulic circuit. Core plunger‑barrel pairs, valve‑plate and slipper components adopt super‑precision grinding and surface quenching hardening treatment, reducing internal leakage and friction loss under extreme cyclic load impact. High‑strength thickened cast pump housing resists mine‑site severe vibration and high‑pressure shock. Every finished pump passes factory full‑pressure impulse test, large‑flow displacement calibration and long‑cycle extreme‑load endurance inspection. Compared with conventional large‑tonnage pump assemblies, CAT390D main pump features accurate electronic regulation, excellent anti‑contamination performance and convenient field power adjustment, effectively improving typical faults of large mining excavators such as insufficient digging force, slow movement response and excessive system heat generation.

product parameters

Brand: CATERPILLAR Genuine Original
Model: CAT390D
Product Name: Electron‑Regulated Dual‑Variable Piston Hydraulic Main Pump Assembly
Applicable Equipment: Caterpillar CAT390D 90‑ton Large Mining Heavy‑Duty Excavator
Structural Type: Dual‑piston variable displacement pump, electronic positive‑flow hydraulic control system, electro‑hydraulic feedback regulation
Core Structure: High‑strength thickened cast pump housing, hardened plunger‑cylinder assembly, wear‑resistant valve‑plate & slipper, electronic proportional regulator, power‑limit control valve group, LS load‑sensing valve, servo piston unit, built‑in charge pump, high‑pressure ageing‑resistant sealing group
Main Material: High‑strength alloy thickened cast housing, carburized hardened alloy plunger, high‑precision valve‑plate, composite high‑pressure sealing parts
Core Function: Convert mechanical energy to ultra‑high‑pressure hydraulic energy, variable displacement adjustment, electronic power‑limit matching, overload pressure‑limiting protection, hydraulic energy supply for whole‑machine actuators
Working Characteristics: Electro‑hydraulic feedback drive, accurate electronic proportional adjustment, stable displacement regulation, good anti‑pollution performance, convenient pressure‑flow onsite adjustment
Working Condition Adaptation: Open‑pit mining operation, hard rock ripping, heavy‑bulk‑material loading, large‑volume earth‑work turnover, long‑duration heavy‑load cyclic operation
Matching Parts: CAT390D electronic positive‑flow main control valve, heavy‑duty hydraulic cylinder group, travel & swing motor, pilot control valve, large‑flow high‑pressure hydraulic pipeline and precision filter elements

advantages

  • Exclusive electronic positive‑flow system calibration for CAT390D, perfect power matching with original C18 engine and main control valve, delivering powerful and stable hydraulic power under hard‑rock mining and heavy‑loading working conditions.
  • Combined electronic proportional adjustment and LS load‑sensing control dynamically adjusts pump displacement according to actual load, reducing unnecessary power loss and improving fuel‑saving performance for large mining machines.
  • Hardened precision plunger‑cylinder and slipper‑valve‑plate assemblies minimize high‑pressure internal leakage, maintaining stable output performance after long‑time continuous heavy‑intensity mine‑site operation.
  • Built‑in charge pump supplies stable large‑flow pilot oil source, ensuring reliable pilot operation under drastic load fluctuation conditions.
  • Heavy‑duty thickened cast pump housing withstands frequent high‑pressure impact and severe mine‑site vibration, enhancing reliability under harsh open‑pit mine environments.
  • Modular internal control‑valve layout supports partial component replacement, lowering spare‑parts cost and on‑site maintenance difficulty for 90‑ton large mining machines.
  • Original mounting dimensions support one‑to‑one direct replacement without modification, shortening equipment downtime for overhaul and reconstruction.

maintenance & replacement tips

  • Inspect pump mounting bolts, pilot‑port connector and oil‑port sealing surfaces regularly to eliminate oil‑leak risks caused by long‑term mine‑site heavy‑load vibration and mechanical impact.
  • Replace hydraulic oil and high‑precision filter elements strictly following Caterpillar official maintenance cycles, to prevent hard granular impurities from scratching precision plunger‑barrel pairs and degrading main‑pump performance.
  • Adopt qualified high‑cleanliness hydraulic oil, to avoid internal component sticking and electronic control signal disorder triggered by oil contamination and deterioration.
  • Periodically test main‑system ultra‑high working pressure, pump output displacement and electronic regulator response status, ensuring the hydraulic main pump runs within the rated pressure range of CAT390D.
  • Avoid persistent full‑load overpressure operation and frequent violent hard‑rock impact, to slow fatigue wear of internal precision hydraulic components.
  • Replace genuine Caterpillar CAT390D hydraulic main pump timely once faults including insufficient heavy‑load digging power, slow actuator response, obvious high‑pressure internal leakage and system continuous high‑temperature occur, so as to restore full‑machine hydraulic power performance.

warehouse

We have built four spare parts warehouses in Xuzhou, Jining, Kunshan and Changsha to provide customers from all over the world with a variety of high-quality spare parts. We can basically ship self-provided spare parts within three days after confirming the order. If the spare parts need to be adjusted or processed, they will be shipped within 7-30 days.

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