Pompa Utama Hidrolik Hitachi EX300-5 – Rekondisi China

1. Fitur & Manfaat Utama

• Professional remanufacturing to Hitachi OEM standards – This main hydraulic pump has been fully disassembled, cleaned, crack‑inspected, and rebuilt in our ISO‑certified facility in China. All worn components – cylinder block, piston assemblies, valve plate, swashplate, bearings, and seals – are replaced with new, high‑quality parts. The result is a pump that delivers performance and reliability comparable to a new unit at a fraction of the cost.

• Original Hitachi tandem axial piston design – The EX300‑5 pump is a variable displacement double (tandem) axial piston pump combining two independent pumping sections in one housing. This design powers travel, swing, boom, arm, and bucket circuits independently, delivering smooth, coordinated multi‑function operation without internal flow loss – exactly as your machine performed when it left the factory.

• Restored 30‑ton class hydraulic power – After remanufacturing, this pump delivers rated working pressure up to 34.3 MPa (≈4,975 psi) and flow matched to the EX300‑5‘s Isuzu B-6SD1T engine (169 kW at 1,900 rpm). With a hydraulic system relief valve pressure of 4,980 psi and operating weight of 31 metric tons, your excavator regains full digging force, fast cycle times, responsive swing, and powerful travel.

• Kontrol daya load-sensing terintegrasi – Sistem kontrol daya pabrik (load-sensing) dibangun kembali sepenuhnya. Sistem ini secara terus-menerus menyesuaikan keluaran pompa dengan permintaan kerja aktual, mengurangi konsumsi bahan bakar, mencegah mesin mati mendadak akibat beban, dan memperpanjang umur seluruh sistem hidrolik. Pompa roda gigi pilot integral juga direkondisi sepenuhnya.

• Alternatif hemat biaya untuk unit asli baru – A new Hitachi main pump for a 30‑ton excavator is a major investment. Our remanufactured pump gives you the same fit, form, and function at a significantly lower price, without sacrificing reliability. Each pump is dyno‑tested on a hydraulic test stand before dispatch.

• Pengganti baut langsung – Mounting flanges, drive shaft splines, and hydraulic port configurations are restored to original Hitachi specifications. No modifications, no adapters, no fabrication – your mechanic unbolts the old pump and bolts this one in. Compatible variants include EX300‑5, EX300LC‑5, EX300LCLL‑5, EX300LCLL‑5M, EX330LC‑5, EX350H‑5, EX350K‑5, EX370‑5M, EX370HD‑5 and EX385USR excavators.

• Verifikasi visual pra-pengiriman – We send you clear, high‑resolution photographs of the actual remanufactured unit (mounting flange, splines, port threads, castings, overall condition) before packing. You approve shipment – we never ship blind.

• Pengiriman cepat – 5–8 hari kerja dari gudang Guangzhou kami. Kapasitas pasokan bulanan 300 unit, tersedia untuk pesanan satuan atau grosir.

2. Aplikasi

The remanufactured Hitachi EX300‑5 main hydraulic pump is ideal for 30‑ton class excavators used in the most demanding job sites:

• Konstruksi berat & infrastruktur – Highway excavation, dam building, bridge footings, and large‑scale earthmoving projects. The restored tandem pump delivers simultaneous boom, arm, and travel power without internal leakage – no power fade, no sluggish response, even on long shifts. Urban development and road construction demand precise hydraulic control, and the load‑sensing system ensures smooth operation whether you‘re trenching near utility lines or working on highway shoulders.

• Penambangan & agregat – Loading trucks, stockpile management, and material handling in abrasive dust conditions are routine in granite, limestone and basalt operations. New bearings, seals, and wear plates ensure the pump survives where worn units fail. Consistent flow and pressure mean faster cycle times and lower fuel consumption, directly impacting your cost per ton.

• Open‑pit mining support – Site cleanup, overburden removal, road maintenance, drainage works, and equipment pad grading. The pump’s load‑sensing control reduces fuel burn during light‑duty cycles, saving money over thousands of operating hours. In mining environments where dust and vibration are extreme, our remanufactured pump with new seals and bearings provides the reliability you need to keep production moving.

• Pembongkaran & pemrosesan besi tua – Shock loads and vibration are routine in demolition yards and metal recycling facilities. Our remanufacturing process replaces all wear components, restoring the pump‘s ability to withstand harsh, unpredictable conditions. The integrated power control prevents engine stall when impact loads spike, maintaining consistent attachment power for shears, pulverizers, and hammers.

• Kehutanan & pembukaan lahan – Steep slopes, fallen timber, hidden obstacles, and remote locations demand hydraulic components you can trust. The integral power control prevents engine stall under sudden load spikes, maintaining consistent hydraulic power for saws, grapples, and mulchers. New seals prevent moisture ingress that is common in wet forestry environments.

• Long‑reach & specialized applications – EX300‑5 Long Reach variants are used for river rehabilitation, coastal work, deep trench excavation, and batching plant responsibilities. The high-track models excel in quarry and mining environments with uneven terrain. A reliable main pump is essential for these specialized configurations where hydraulic demand varies constantly.

3. Mengapa Memilih Bagian Hongtengda – Quality You Can Trust

At Hongtengda Parts, we have been remanufacturing hydraulic pumps for Hitachi excavators since 2001. We know that a main pump failure on your EX300‑5 stops your job site completely. Our remanufacturing process is not a “clean and reseal” – it is a factory‑grade restoration.

Proses rekondisi 6 langkah kami:

1. Pembongkaran total – The pump is stripped down to individual components: cylinder block, piston assemblies, valve plate, swashplate, bearings, shaft, housing, and control valves.

2. Pembersihan & inspeksi retak – Semua bagian dibersihkan secara menyeluruh dan diperiksa retak menggunakan pengujian penetran pewarna pada coran kritis. Bagian yang tidak dapat diperbaiki dimusnahkan.

3. Penggantian komponen aus – All seals, O‑rings, bearings, and gaskets are replaced with new components. The cylinder block and valve plate are precision‑ground to restore flatness. Piston assemblies are matched as a set and replaced if worn. The swashplate surface is reconditioned.

4. Perakitan presisi – Components are reassembled using OEM torque specifications. Clearance tolerances on the cylinder block / valve plate interface are verified using dial indicators.

5. Validasi meja uji hidrolik – The completed pump is mounted to a test stand and run through its full pressure and flow range. We verify operating pressure (up to 34.3 MPa), flow rate, case drain leakage, and load‑sensing control response. A test report is available upon request.

6. Pemeriksaan kualitas akhir & pengemasan – The pump is painted, fitted with protective port caps, and packed in a heavy‑duty wooden case for export.

Mengapa pompa rekondisi kami mengungguli unit “rebuilt” yang lebih murah:

• Bantalan dan segel baru – Banyak perombak murah menggunakan kembali bantalan lama untuk menghemat biaya. Kami tidak. Semua komponen berputar mendapatkan bantalan baru – faktor paling penting untuk umur panjang pompa.

• Permukaan aus yang digerinda presisi – Blok silinder dan pelat katup digerinda ulang untuk mengembalikan kerataan. Permukaan yang dilap sangat penting untuk kebocoran internal yang rendah. Tanpa itu, pompa akan terlalu panas dan kehilangan tenaga dalam hitungan minggu.

• Laporan pengujian lengkap – Berdasarkan permintaan, kami menyediakan laporan pengujian yang menunjukkan pengukuran tekanan, aliran, case drain, dan suhu. Anda melihat data sebelum membeli.

Apa yang tidak Anda beli: A used pump with new paint and a set of O‑rings. Our remanufactured pump is restored to meet or exceed OEM performance standards – at a price that makes sense for your EX300‑5.

• Pengalaman industri 25+ tahun – Didirikan pada tahun 2001, kami telah merekondisi ribuan pompa untuk Hitachi, Caterpillar, Komatsu, Kobelco, Volvo, SANY, dan banyak merek lainnya.

• Ketersediaan stok 90% – EX300‑5 main hydraulic pumps are in stock as remanufactured units, ready for dispatch from our Guangzhou warehouse.

• Pengiriman 24 jam – Dari pusat Guangzhou kami ke forwarder Anda dalam 1 hari; pesanan internasional dikirim dalam waktu 24 jam.

• Verifikasi visual pra-pengiriman – Kami tidak pernah mengirim pompa secara buta. Anda menerima foto jelas dari unit sebenarnya sebelum pengemasan – Anda menyetujui, kami kirim.

• Dukungan teknis – Send us your EX300‑5 machine serial number and a photo of the old pump. We confirm compatibility and provide installation guidance within 2 hours.

Send us your Hitachi EX300‑5 machine serial number and a photo of the old pump – we will verify fitment, provide a quote, and document our pre‑shipment inspection within 24 hours.

Critical installation tip for the EX300‑5 remanufactured pump:
– saluran case drain must be clear and unrestricted. A blocked case drain will blow the shaft seal instantly on first startup.
– Before installing the remanufactured pump, flush the entire hydraulic system and replace all filters. Contaminants from the failed pump will destroy a remanufactured unit just as quickly as a new one.
– Gunakan O-ring dan ring penyegel baru pada setiap sambungan hidrolik. Segel bekas pasti menyebabkan kebocoran.
– After installation, run the engine at low idle for 2–3 minutes with the pump in neutral, then slowly cycle each function (boom, arm, bucket, swing, travel) to purge air from the system.
– Periksa kesejajaran pompa dengan rumah roda gila mesin – ketidaksejajaran menyebabkan kegagalan bantalan prematur dan kebocoran segel poros.

Catatan garansi: Masa garansi adalah 3 hingga 6 bulan tergantung detail produk. Kami tidak memberikan layanan garansi untuk suku cadang bekas asli atau remanufaktur. Nilai kami diberikan di muka: rekondisi yang cermat, pengujian menyeluruh, dan verifikasi visual pra-pengiriman. Untuk pelanggan yang memerlukan opsi dengan garansi, kami dapat menawarkan unit aftermarket baru – tanyakan kepada tim penjualan kami.

The main hydraulic pump is the heart of your EX300‑5‘s hydraulic system. A reman pump is a transplant from a tired donor with unknown hours. Our remanufactured pump is restored to meet OEM performance standards – not with shortcuts, but with genuine factory‑grade restoration. Send us your EX300‑5 machine serial number – we will confirm compatibility and provide a quote within 24 hours.