551-1122 Hydraulic Main Pump 5511122 for C7.1 Engine 330 330GC Excavator Construction Machinery Parts

The 551-1122 Hydraulic Main Pump, also referenced as 5511122, is a heavy-duty replacement hydraulic pump designed for 330 and 330GC excavators equipped with C7.1 engine applications.

As a key component of the excavator hydraulic system, the main pump converts mechanical power into hydraulic flow to operate essential functions such as the boom, arm, bucket and travel system. This replacement pump is engineered to provide stable hydraulic output, responsive operation and reliable performance under demanding construction and earthmoving conditions.

With robust construction and precision-machined internal components, the 551-1122 hydraulic pump is suitable for excavator repair, hydraulic system overhaul and replacement of worn or damaged main pumps.

Product Features

• Part Number: 551-1122 / 5511122
• Product Type: Excavator Hydraulic Main Pump
• Suitable for 330 Excavator
• Suitable for 330GC Excavator
• Application associated with C7.1 engine-equipped machinery
• Stable hydraulic flow and pressure output
• Strong power transmission for demanding operations
• Precision-machined internal components
• Heavy-duty pump housing for reliable operation
• Designed for smooth and responsive hydraulic performance
• Suitable for direct replacement applications
• Individually inspected before shipment

Product Specifications

Compatible Models

The 551-1122 / 5511122 Hydraulic Main Pump is intended for applications including:

330 Excavator
330GC Excavator
C7.1 Engine Applications

Compatibility Notice: Hydraulic pump specifications can vary according to machine serial number and configuration. Please confirm the 551-1122 / 5511122 part number, excavator model, machine serial number and original pump information before ordering.

Key Advantages

Stable Hydraulic Performance

Designed to provide consistent hydraulic flow and pressure, supporting smooth operation of the excavator's major hydraulic functions.

Strong Power Output

Efficiently converts engine power into hydraulic energy to support digging, lifting, loading and travel operations.

Heavy-Duty Construction

The robust pump body and internal components are designed for demanding construction, excavation and earthmoving environments.

Responsive Operation

Stable hydraulic output helps maintain responsive boom, arm and bucket movements for efficient machine operation.

Reliable Replacement Solution

Suitable for replacing worn, damaged or inefficient hydraulic main pumps during excavator repair and overhaul projects.

Main Hydraulic Functions

The excavator main pump supplies hydraulic power required for multiple machine functions, including:

• Boom lifting and lowering
• Arm / stick movement
• Bucket digging and dumping
• Swing operation
• Excavator travel
• Attachment operation
• Other hydraulic circuits

Maintaining proper hydraulic pump performance is essential for machine productivity and operating efficiency.

Common Signs of Hydraulic Main Pump Failure

Inspection or replacement may be required when the excavator shows symptoms such as:

• Weak hydraulic power
• Slow boom, arm or bucket movement
• Unstable hydraulic pressure
• Abnormal pump noise
• Hydraulic pump overheating
• Hydraulic oil leakage
• Reduced digging force
• Slow response during operation
• Machine functions becoming weak under load

Before replacing the pump, the complete hydraulic system should be inspected to identify the actual cause of the problem.

Applications

The 5511122 Hydraulic Main Pump is suitable for excavators working in demanding environments such as construction sites, earthmoving projects, road construction, quarry operations, infrastructure projects and general heavy-equipment applications.

Why Choose JISION?

JISION specializes in replacement parts for excavators and construction machinery, supplying hydraulic pumps, travel motors, swing motors, final drives, engine parts, electrical components, cooling system parts and other excavator spare parts.

For international buyers, distributors, repair workshops and equipment owners, we support single-unit purchases and bulk orders, along with part-number verification, secure export packaging and international shipping options.

Order Information

For faster quotation and compatibility checking, please provide:

Part Number: 551-1122 / 5511122
Machine Model: 330 / 330GC
Engine Model: C7.1
Machine Serial Number: Recommended
Quantity: 1 PC or Bulk Order

For hydraulic pumps, providing photos of the original pump, pump nameplate and machine serial number is strongly recommended before ordering.

Short Description

JISION 551-1122 / 5511122 Hydraulic Main Pump for 330 and 330GC excavators with C7.1 engine applications. Designed for stable hydraulic flow, strong power output and reliable heavy-duty performance. Ideal for excavator hydraulic system repair and main pump replacement.

SEO Meta Description

Shop 551-1122 5511122 hydraulic main pump for 330 330GC excavator C7.1 applications. Stable hydraulic performance and reliable replacement from JISION.