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Home > Truck Machinery Parts > OEM AT320769 Tandem Main Pump Replacement for John Deere Dump Truck 350D 400D Manufacturer, Factories
OEM AT320769 Tandem Main Pump Replacement for John Deere Dump Truck 350D 400D Manufacturer, Factories
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OEM AT320769 Tandem Main Pump Replacement for John Deere Dump Truck 350D 400D Manufacturer, Factories

OEM AT320769 Tandem Main Pump Replacement for John Deere Dump Truck 350D 400D Manufacturer, Factories

AT320769 is the OEM-specification tandem main pump replacement for John Deere 350D and 400D dump trucks, designed to replace original equipment components and ensure efficient, stable operation of the vehicle's hydraulic system. It supports core functions such as hydraulic lifting and serves as a critical component for hydraulic power supply in heavy-duty applications. Featuring two coaxially arranged pump cores in series, it simultaneously delivers dual pressure oil outputs to separate hydraulic circuits (e.g., lift + steering). This design enhances system integration and space utilization while meeting the dual-circuit hydraulic requirements of the 350D/400D dump trucks.

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Product Description

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Product Overview

AT320769 serves as the OEM-specification series main pump replacement for 350D/400D dump trucks. With core advantages of “precise fitment, high-pressure efficiency, and durable reliability,” it perfectly replicates the original hydraulic system performance through a dual-pump series integrated design and 34.3MPa high-pressure compatibility. Its reinforced wear-resistant materials and sealing technology enable operation in harsh environments like mining and construction sites, delivering a service life exceeding 10,000 hours. Full OEM compatibility ensures a hassle-free “direct replacement, no adjustment required” experience, significantly reducing downtime and maintenance costs.
From a user value perspective, this pump not only resolves the pain points of aftermarket parts—such as weak lifting power and frequent failures—but also reduces fuel consumption through over 92% volumetric efficiency, balancing operational efficiency and usage costs. Backed by comprehensive warranty services and technical support, the AT320769 stands as the optimal choice for upgrading or replacing hydraulic systems in 350D/400D dump trucks, delivering sustained, reliable power for heavy-duty operations.
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Specifications

Part Name Hydraulic Pump Part Number AT320769
Product Type TANDEM MAIN PUMP Pump Type Variable-displacement electro-hydraulically controlled axial piston series main pump
Origin China Quality OEM Standard
Compatible Type Dump Truck Compatible Model 350D/400D
Core Usage Provides a stable high-pressure oil supply for the hydraulic lifting system, steering system, and other components of dump trucks, driving the operation of actuators.
Compatible System Vehicle OEM hydraulic circuit, compatible with hydraulic systems meeting corresponding pressure and flow parameters
Related Models Common Alternatives / Matching Numbers: TT210249, RE181544, SJ14509, etc
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Key Features

Dual Pump Series Design Integrates two hydraulic pump cores in a coaxial series layout, enabling simultaneous output of dual pressure oil streams to supply separate hydraulic circuits (e.g., lift + steering).
High-Pressure Compatibility Designed to OEM standards, typically compatible with the 30-35MPa high-pressure conditions common in heavy-duty dump trucks. Ensures ample power when lifting heavy loads.
Efficient Power Transmission High volumetric efficiency minimizes energy loss while reducing fuel consumption. Delivers high transmission efficiency and rapid response for smooth lifting/lowering operations.
Enhanced Durability Constructed from high-strength cast iron for impact resistance. Critical friction pairs feature wear-resistant coatings to extend service life and reduce maintenance frequency.
OEM Specification Compatibility Installation dimensions and interface specifications are identical to original components, enabling direct in-place replacement without modifying mounting brackets.
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Compatible Models

350D 400D
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Frequently Asked Questions

What models and pump types are compatible with AT320769?
The AT320769 is a dual-stage main hydraulic pump specifically designed for 350D and 400D dump trucks. It is a variable displacement piston pump responsible for functions like lifting and steering.
When should this hydraulic main pump be replaced?
Replacement is recommended if you notice abnormal hydraulic oil pressure, increased noise or vibration, abnormally elevated oil temperatures, severe leakage, or sluggish lifting/steering response.
Is the AT320769 pump a direct replacement?
Yes, it features OEM specification compatibility. The installation dimensions and interface specifications are identical to the original components, allowing for a "direct replacement" without adjustments.
What is the expected service life of this pump?
Due to reinforced wear-resistant materials and precision machining, this pump is designed for high-intensity environments and can deliver a service life exceeding 10,000 hours.
How do I ensure a successful installation?
Key steps include cleaning port areas, replacing all seals, tightening bolts in a diagonal sequence (approx. 80–100 N·m), and thoroughly bleeding air from the system after filling with new oil.
What are the common installation errors to avoid?
Common errors include not tightening bolts to torque (leading to vibration), incorrect seal orientation, failing to replace filter elements, and incomplete air purging which causes cavitation noise.

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