PC350‑5 Main Control Valve for Komatsu PC350‑5 35‑ton Heavy‑duty Excavator spare parts

Short Description:

The Komatsu PC350‑5 main control valve is an original mechanical load‑sensing multi‑way valve developed for Komatsu PC350‑5 35‑ton heavy‑duty excavator. As the core hydraulic distribution hub of the whole machine, it adopts classic OLSS open‑load‑sensing hydraulic logic, perfectly matching the main pump power output and engine torque characteristics of PC350‑5. It distributes hydraulic flow for boom, arm, bucket, travelling and slewing actuators, realizing direction switching, flow adjustment and multi‑action compound coordination. Optimized for quarry mining, heavy rock excavation, large‑volume earth‑moving and long‑time heavy‑load cyclic operation, this valve delivers reliable flow distribution, stable compound‑action performance and strong anti‑pollution capability, adapting to the harsh working conditions of early‑generation large‑tonnage excavators.

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description

Genuine Komatsu PC350‑5 multi‑way valve adopts modular combined valve‑block construction, assembled with precision spool‑sleeve pairs, built‑in LS load‑sensing shuttle valve group, pressure‑compensation assemblies, multi‑stage main relief valves and overload buffer valves. Driven by hydraulic pilot signal, it completes stepless flow regulation without electronic control unit. Internal valve‑core pairs go through super‑precision grinding and surface hardening treatment to reduce friction and internal leakage under long‑term heavy‑load impact. The integral high‑strength cast valve body resists vibration and pressure shock from quarry‑site operation. Each finished valve passes factory full‑pressure impulse test, flow calibration and endurance inspection. Compared with later electronically‑controlled valve versions, PC350‑5 mechanical control valve features simple and reliable structure, strong oil‑contamination resistance and convenient on‑site maintenance, effectively solving common faults such as jittery compound movements, slow response and insufficient pressure protection for aged large excavators.

product parameters

Brand: KOMATSU Genuine Original

Model: PC350‑5

Product Name: Mechanical OLSS Load‑Sensing Multi‑way Main Control Valve Assembly

Applicable Equipment: Komatsu PC350‑5 35‑ton Heavy‑duty Excavator

Structural Type: Modular combined multi‑spool valve, mechanical OLSS open load‑sensing system, hydraulic pilot control

Core Structure: High‑rigidity cast combined valve block, hardened precision spool‑sleeve assembly, LS load‑sensing shuttle‑valve set, pressure‑compensation unit, multi‑stage relief valve, overload buffer valve, high‑pressure ageing‑resistant sealing assembly

Main Material: High‑strength alloy cast valve body, wear‑resistant hardened alloy spool, high‑precision valve sleeve, composite high‑pressure sealing parts

Core Function: Hydraulic flow distribution, direction switching, load‑sensing flow compensation, multi‑actuator compound‑action coordination, multi‑stage overload pressure‑limiting protection

Working Characteristics: Pure‑hydraulic pilot drive, reliable mechanical feedback, good anti‑pollution performance, stable pressure‑holding performance, convenient field adjustment and maintenance

Working Condition Adaptation: Quarry stone excavation, heavy‑material loading, large‑scale earthworks, foundation excavation, long‑duration heavy‑load cyclic operation

Matching Parts: OLSS‑series hydraulic main pump, heavy‑duty hydraulic cylinder group, travel & swing motor, hydraulic pilot valve, high‑pressure hydraulic pipeline and filter elements

advantages

Dedicated OLSS load‑sensing calibration for PC350‑5, well‑matched with original main pump and engine, delivering stable flow output under heavy‑load stone‑digging conditions.
Built‑in pressure‑compensation mechanism stabilizes flow of each oil circuit, ensuring smooth compound movements without obvious speed fluctuation when multiple actuators work simultaneously.
Hardened spool‑sleeve matching pairs reduce internal friction and steady‑state leakage, maintaining stable control performance after long‑time quarry‑site continuous operation.
Multi‑level relief and overload‑buffer valves absorb sudden load impact, protecting hydraulic cylinders and motors from pressure‑shock damage during frequent working‑condition switching.
Pure‑mechanical‑hydraulic control structure has fewer electronic vulnerable components, showing strong tolerance to oil contamination and high adaptability for poor‑quality‑oil‑field environments.
Modular combined‑valve‑block layout supports partial single‑valve‑piece replacement, lowering spare‑parts cost and on‑site maintenance difficulty for aged large‑tonnage machines.
Original mounting dimensions support one‑to‑one direct replacement without modification, shortening equipment downtime for overhaul and reconstruction.

maintenance & replacement tips

Inspect valve‑block mounting bolts, oil‑port joints and sealing surfaces regularly to eliminate oil‑leak risks caused by long‑term quarry‑site heavy‑load vibration and mechanical impact.
Replace hydraulic oil and filter elements strictly following Komatsu official maintenance cycles, to prevent hard granular impurities from scratching precision spool‑sleeve pairs and degrading valve‑group control performance.
Adopt qualified high‑cleanliness hydraulic oil, to avoid spool sticking and LS‑feedback disorder triggered by oil contamination and deterioration.
Periodically test main‑system pressure, relief‑valve set‑pressure and load‑sensing response status, ensuring the multi‑way valve runs within the rated pressure range of PC350‑5.
Avoid persistent full‑load overpressure operation and frequent violent rock‑breaking impact, to slow fatigue wear of internal precision valve‑core components.
Replace genuine Komatsu PC350‑5 main control valve timely once faults including jittery compound movements, weak actuating force, obvious internal leakage and system pressure drift appear, so as to restore full‑machine hydraulic distribution 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.