Fluctuating hydraulic output, sluggish working action and frequent main pump breakdowns remain major burdens for parts distributors, service workshops and large construction fleet operators. Our 551-1122 / 5511122 hydraulic main pump assembly is professionally matched for Caterpillar 330GC excavator hydraulic system. Built with integrated precision structure and optimized internal flow channel design, it avoids common procurement pain points such as insufficient power output, poor heat dissipation and short service life, fully adapted to high-intensity continuous operation in mining and large earthmoving projects.
Item NO.:
551-1122Order(MOQ):
1Payment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANLead Time：
2-3 DAYSGeneric assembled pump units often suffer from internal matching deviation and rapid performance decay, leading to repeated maintenance and rising operational costs. This 551-1122 main pump assy adopts strictly calibrated internal component coordination and pressure-resistant overall structure. It delivers steady hydraulic power transmission, supports dealers’ batch inventory planning, and guarantees long-term efficient and stable operation for Caterpillar 330GC engineering equipment.
| Part Number | 551-1122 |
|---|---|
| Part Name | Hydraulic Pump |
| Compatible Brand | Caterpillar |
| Applicable Models | 330GC |
| Application | Excavator |
| Material | High-strength cast iron housing + alloy steel internal components |
| Product Color | Industrial mechanical gray |
| Working Temperature | -28℃ to 90℃ |
| Key Function | Provide overall hydraulic power source for excavator, control oil circulation and support all working actions |
| Condition | 100% New, Aftermarket / OEM Quality |
| Packaging | Wooden Case/Reinforced Carton/Neutral Packing / Customized Box |
FAQ
A: We provide original, OEM, and high-quality aftermarket versions with stable supply capability.
Q:Why Choose RITO?
A:Listed Factory
Stable&Reliable Quality
OEM Factory for Chinese Top Excavator Brands
Supplier to Fortune 500 Companies
RITO Excavator Stick Cylinder is built for ZX120, ZX200, ZX210, EX200-1, and 320CLZBYG. For distributors and agents: high interchangeability reduces inventory complexity. Mining customers benefit from reinforced sealing and shock resistance, lowering downtime and maintenance costs.
View More
This RITO 527-0741 527-0742 Hydraulic Pump Coupling Hub is a key transmission component for Caterpillar CAT 336GC and 336D excavators, designed to connect the engine and hydraulic pump with stable torque transfer. Featuring a 15-tooth flange structure, it ensures precise alignment, smooth power delivery, and reliable operation in demanding construction environments.
View More
This RITO 124-1607-OT Hydraulic Oil Cooler is a key cooling component for Caterpillar CAT 320C, 320D, 325D, and 330D excavators, designed to effectively dissipate heat from hydraulic oil and maintain optimal system temperature. It ensures stable oil viscosity, protects internal components, and supports reliable operation in demanding construction environments.
View More
This RITO 234-4440 Swivel Joint (Rotary Union) is a critical hydraulic component for Caterpillar CAT 336D, 325D, and 330D excavators, designed to transfer hydraulic oil between the upper structure and undercarriage during continuous rotation. It ensures stable oil flow to travel motors, maintaining smooth operation and reliable performance in construction environments.
View More
Hydraulic lag and erratic pressure in CAT excavators often signal a failing proportional valve, causing costly site delays. The 585-9230 eliminates these inefficiencies. Precision-engineered for mining and heavy construction, it prevents system overheating and jerky boom movements.
View More
Hydraulic lag and erratic pressure in CAT excavators often signal a failing proportional valve, causing costly site delays. The 585-9230 eliminates these inefficiencies. Precision-engineered for mining and heavy construction, it prevents system overheating and jerky boom movements.
View More
The RITO Excavator Coil Spring 179-6916-Y is designed for heavy-duty applications in CAT excavators, offering reliable and long-lasting performance in demanding work environments. This high-quality spring ensures consistent and efficient load-bearing capability, reducing wear and tear on critical excavator components. The 179-6916-Y is essential for maintaining optimal machine performance in industries such as construction and mining. By minimizing downtime and maintenance costs, this coil spring enhances productivity and contributes to the long-term durability of your fleet. Designed for seamless compatibility with various CAT excavator models, it provides an ideal replacement solution for wholesale distributors and agents.
View More
Unstable fan speeds and hydraulic overheating often stem from inefficient pump pressure. In grueling mining sites, a failing fan pump leads to engine derating and massive downtime. The 291-0061 solves these thermal inconsistencies, preventing the costly "cascading failures" that plague heavy excavator fleets.
View MoreLeave A Message
Scan to wechat :
