Komatsu 708-1L-00551 hydraulic pump for Komatsu PC138US-2E1 midi excavator
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Product Brief
This aftermarket axial piston main pump, part number 708‑1L‑00551, serves as the core hydraulic power assembly for Komatsu PC138US‑2E1 short‑tail swing excavator. It converts engine output torque into adjustable high‑pressure hydraulic flow to realize tight‑radius excavation, foundation trenching, material loading and multi‑joint compound movements. Widely deployed in urban road renovation, confined‑space municipal construction and residential site development scenarios, this aftermarket replacement pump is highly favored by overseas service garages, equipment rental operators and cross‑border spare‑part distributors for direct pump swap and periodic hydraulic system overhaul for Komatsu short‑tail excavator fleets.
Subjected to long‑duration cyclic loading, hydraulic oil particle contamination and frequent pressure surges on complex construction sites, the original pump will gradually generate cylinder block scratching, piston shoe degradation, valve plate wear and growing internal leakage. Typical equipment failure signals include diminished digging force, lagging boom‑arm compound motions, insufficient travel output, persistent hydraulic oil overheating, plus noticeable pump vibration and rattling noise under digging load. Once the main pump suffers catastrophic failure, the whole machine stops operation, bringing unplanned project downtime and extra maintenance expenditure for equipment end‑users.
Our aftermarket replacement pump strictly replicates original sample specifications for mounting hole layout, input shaft spline profile, oil port layout and regulator pressure setting values. Field technicians can complete direct installation without cutting, drilling or auxiliary adapter modification, effectively cutting down machine stand‑still hours. Compared with high‑cost genuine original pumps with lengthy procurement lead‑times, this hydraulic pump delivers reliable on‑site performance and satisfies recurring bulk‑order purchasing demands for global Komatsu excavator spare‑part suppliers.
Product Highlights
1. Full dimensional interchangeability supporting fast field overhaul
All critical mounting sizes, spline tooth parameters and oil port positions match original OEM assemblies completely. Service crews can finish pump dismount‑mount work without secondary machining, boosting overhaul efficiency for machinery repair shops and used‑equipment refurbishment projects.
2. Optimized friction‑pair craftsmanship for confined‑site heavy‑duty work
Many low‑cost alternative pumps suffer sharp performance drop when working with aged hydraulic fluid mixed with fine impurity particles. Our core internal friction components adopt upgraded heat‑treatment together with multi‑step precision lapping craft, enhancing anti‑wear and anti‑pressure‑shock performance, extending service life for PC138US‑2E1 machines operating in narrow municipal construction sites.
3. Rigorous bench‑test validation implemented before shipment
Every finished hydraulic pump undergoes pressure endurance testing, flow‑rate calibration and sealing leakage inspection on dedicated hydraulic test benches prior to packing. Potentially defective units are screened within factory premises, lowering re‑work risks for repair teams and preventing unexpected construction‑site shutdown triggered by pump malfunction.
4. Practical aftermarket solution for medium‑size excavator fleet maintenance
Genuine main pumps for Komatsu PC138US‑2E1 carry high purchasing cost and unstable stock supply. Our factory‑direct aftermarket replacement pump balances dependable operating stability and competitive pricing, helping machinery owners and service merchants control total overhaul expenditure for short‑tail excavator fleets.
5. Versatile logistics options for wholesale purchasers
In‑stock goods support prompt shipment upon payment confirmation. Air freight is accessible for urgent emergency breakdown orders. Sea consolidation and full‑container transport schemes help overseas bulk buyers cut comprehensive logistics expenses.
Factory Production Strength
Our manufacturing base focuses on R&D and volume manufacturing of aftermarket hydraulic replacement components for Japanese‑brand medium‑size and short‑tail excavators, covering main hydraulic pumps, travel gearboxes and swing motors. We maintain complete production workflows: alloy‑steel forging, precision grinding, professional heat‑treatment and finished‑product hydraulic bench validation. Simulated short‑radius frequent‑cycle load tests are performed to verify component durability matching real‑world municipal and urban construction operating conditions. Our spare parts are exported to multiple overseas territories and keep long‑term stable cooperative partnerships with global construction‑machinery spare‑part wholesalers.
Frequently Asked Customer Questions
Q1: Can this 708‑1L‑00551 hydraulic pump fit other Komatsu excavator models?
A1: Cross‑model installation is not recommended. Different pump assemblies vary in shaft spline, regulator setup and pressure calibration parameters. Kindly double‑check your machine model and original part number before submitting orders.
Q2: What hydraulic malfunctions can this main pump resolve?
A2: It fixes faults induced by internal‑component abrasion: insufficient digging force, sluggish compound movements, excessive hydraulic oil temperature, internal leakage and abnormal pump vibration or knocking noise.
Q3: Is tiered discount available for large‑quantity orders?
A3: Yes, preferential pricing is subject to purchasing volume. Full‑container sea freight arrangement can be supported to reduce overall logistics cost.
Q4: What export‑grade packaging is adopted for long‑distance overseas transit?
A4: Anti‑rust grease is evenly applied to all metal functional surfaces. The hydraulic pump is wrapped with waterproof shock‑absorbing PE film, then secured inside reinforced export plywood case, protecting components from collision deformation and rust accumulation during long‑haul ocean transportation.