Hydraulic Parts/Piston Pump Motors

Products & Range Coverage
A&S MACHINERY CO., LTD. delivers an extensive inventory of specialized piston pumps and motors within our hydraulic parts catalog to support diverse heavy-duty equipment. Our product lineup covers a broad range of machine series and fluid power configurations, ensuring that every component meets rigorous Komatsu standards for high-pressure generation and mechanical transmission:
• Machine & Piston Pump Motor Application Compatibility: Engineered for a broad range of Komatsu heavy-duty excavators, loaders, and bulldozers, our parts ensure exact displacement ratings, pressure classes, and mounting configurations for a 100% perfect match, rapid installation, and factory-grade hydraulic performance.
• Complete Heavy-Duty Pump Motor Range: 1. Main Variable Piston Pump Assemblies: Engineered specifically to endure high-pressure alternating loads with superior self-priming and power control capabilities; 2. Travel & Slewing Piston Motor Assemblies: Providing robust rotational torque and full-speed climbing drive forces for heavy equipment mobility; 3. Rotating Kits & Spare Parts: High-precision wear-resistant replacements, including cylinder blocks, pistons, valve plates, and back plates.
• OEM & Heavy-Duty Aftermarket: We offer certified original equipment manufacturer Komatsu pumps and motors alongside rigorous bench-tested aftermarket heavy-duty parts which complete 1,000 hours of full-load bench testing with volumetric efficiencies and durability exceeding industry benchmarks, delivering exceptional operational reliability and extended service lifespan at a cost-effective procurement point for global clients.

Supply Chain & Logistics
We maintain a robust operational infrastructure designed to support global piston pump and motor procurement through direct supply channels, delivering reliable stock availability and rapid dispatch to build trust with international equipment owners and repair facilities.
• Massive Inventory and Cross-Reference: We maintain large-volume stock of hundreds of differing specifications of main hydraulic pumps and motors for Komatsu mainstream heavy-duty machines across every series. Backed by barcode-enabled intelligent warehousing and Komatsu cross-reference databases, we guarantee precise matching and immediate dispatch upon order confirmation to fulfill routine maintenance and rapid replacement needs for overseas fleet workshops and minimize equipment downtime caused by sudden main pump scoring and damage leading to machine operational paralysis.
• Port Sealing and Heavy-Duty Crated Protection: We implement specialized industrial packaging standards for piston pump and motor products featuring internal micron-level precision ground rotating kits, high-value heavy hydraulic assemblies that are highly vulnerable to housing flange fracture, internal precision mating surface contamination from dust ingress, or moisture corrosion during transcontinental transport, utilizing pressure-resistant threaded flange covers and specialized dust plugs to seal all inlet and outlet ports tightly against salt spray and dust, while the assembly is fully encapsulated and suspension-fixed inside high-density custom EPE molded packaging, secured within heavy-duty export fumigated wooden crates to completely eliminate housing impact cracking during cross-border ocean logistics.
• Consolidated Sourcing for Hydraulic Overhaul Kits: We support overseas clients by consolidating major piston pumps alongside matching components, such as pilot gear pumps, complete hydraulic oil filter sets, and system flushing oil, into precise bundled full-set hydraulic pump and filter kits, achieving a one-stop purchasing model that pairs hydraulic power core units while significantly reducing comprehensive logistics costs for overseas workshops.

Engineering Solutions & Technical Support
Our technical framework focuses on resolving field-level operational challenges to eliminate equipment downtime, moving beyond simple parts distribution to deliver comprehensive engineering and service capabilities for fluid transmission asset reliability.
• Application-Specific Durability Solutions: We address common field issues in extreme jobsite environments, such as heavy open-pit quarries and high-dust continuous high-load operations where standard factory piston pumps suffer valve plate scorching and cylinder block scoring due to insufficient hydraulic oil filtration accuracy. We also provide professional engineering upgrades, including special wear-resistant alloy valve plates and high-strength ductile iron cylinder blocks engineered with substantially increased anti-contamination and anti-thermal-shock capabilities.
• Troubleshooting and Maintenance Guidelines: We address common user concerns regarding Komatsu excavator normal cold performance transitioning to slow and weak overall operation when hot due to severe piston pump internal leakage, or new pumps burning out shortly after installation due to metallic debris jamming, by providing professional diagnostic and maintenance guidance. This includes emphasizing strict adherence to system flushing and oil and filter replacement protocols requiring technicians to completely drain and high-pressure circulate-clean the hydraulic oil tank, circuits, and return coolers and force-replace all high-precision hydraulic filter elements prior to installing a new piston pump, strictly prohibiting the introduction of old oil containing residual metallic debris to prevent secondary burnouts of new pumps, alongside enforcing casing pre-filling and bleeding protocols requiring mechanics to fill the pump housing completely with clean hydraulic oil through the body port before initial startup and operate at low speeds under zero load while loosening bleed screws to purge trapped air completely, strictly prohibiting dry running.
• Expert Technical Support and Safety Guidelines: We provide technical documentation covering hydraulic main pump performance parameter tables, assembly torque standards, displacement control valve adjustments, and hydraulic system air bleeding guides for Komatsu equipment, assisting overseas technical personnel in maintaining standardized installations.

Call to Action & User Experience
Optimize your machinery hydraulic transmission reliability and overhaul efficiency today by utilizing our interactive tools placed across strategic positions on our platform.
• Multi-Dimensional Intelligent Search and Specification Filtering: Benefit from advanced search functions supporting fast product filtering by Komatsu machine model (such as PC200-8, PC360-7, PC400-8, or WA380), accessory categories (such as main piston pump, travel motor, slewing motor, or rotating spare parts), displacement specifications, or original equipment manufacturer part numbers to lock onto target products instantly.
• RFQ and Piston Pump Kit Quotation: Access our fast-response interactive channels providing one-click bill of materials uploads for fleet Komatsu machinery hydraulic system overhaul procurement lists, including main pump, pilot pump, and filter combinations, to receive bundled assembly quotations and international logistics freight estimates, fulfilling workshop emergency repairs and large-scale periodic spare parts reserve procurement requirements.
• Consultation and Support: Utilize our around-the-clock professional technical support channels staffed by senior Komatsu machinery hydraulic transmission and piston pump overhaul experts to assist overseas clients in verifying compatibility for legacy non-standard pump parameters, alternative model upgrades, and internal leakage troubleshooting solutions, ensuring cross-border procurement runs error-free.