Hydraulic Main Pump 551-1122 for 330GC Excavator

Built around a variable-displacement piston pump design, the 551-1122 main hydraulic pump adjusts hydraulic output according to operating demand. It supports coordinated excavator movements and helps maintain responsive operation during digging, lifting, and other work cycles.

To help check the correct pump configuration, please provide the machine model and serial number, existing pump part number, a clear nameplate photo and full pump photos from several sides. Close-up photos of the drive shaft, mounting flange, hydraulic ports, regulator and electrical connectors are particularly useful. Please also tell us about any known modifications to the machine or hydraulic system. If the nameplate is unreadable, send the available photos first, and we will advise what additional information is needed. A matching model name alone does not establish compatibility with every machine configuration.

Send the existing pump photos and your repair requirements. We can help review the replacement configuration and clarify what is included before you schedule installation. This gives your technicians a clearer basis for checking the proposed assembly against the pump removed from the machine.

Provide the customer's machine details, required condition and quantity. We can prepare a supply proposal for your resale inquiry and review related hydraulic parts requested in the same order. Clear product descriptions and supply details help you communicate the offer to your customer.

Tell us the machine location, delivery destination and required arrival date. We will check availability and transport options so you can assess the proposed delivery against your maintenance schedule. Stock status, preparation time and shipping transit time are confirmed separately.

Guangzhou Tieqi Construction Machinery Co., Ltd., established in 2010 in Guangzhou, China, supplies hydraulic system components under its IRON CAVALRY brand. Our business combines manufacturing and assembly resources with product identification, quality inspection and international trade services. Our product range includes hydraulic pumps, main control valves, final drives, travel motors, swing motors, gearboxes and hydraulic cylinders. For your 593-8368 pump inquiry, our focus is straightforward: help you clarify the pump specification, understand the offered supply and prepare the information needed for an informed purchasing decision.

A matching machine model or part number is an important starting point, but the offered assembly still needs to be checked against your existing pump. Differences in mounting details, hydraulic connections, regulators or electrical connectors can complicate installation. Send clear photos of the nameplate, shaft, flange, ports and control components so we can help review the proposed configuration before ordering.

Machine Down? Get the Pump Details Right Before You Order.

When your excavator is out of service, you need a clear replacement plan. An uncertain pump configuration, unclear product condition or an unconfirmed dispatch date can make repair planning more difficult. Tieqi helps you check the key purchasing details for the 593-8368 main hydraulic pump before you commit to an order.

FAQ

Q1: What does the hydraulic main pump do?
A: It supplies pressurized hydraulic oil to power the excavator's working functions.

Q2: What symptoms may indicate a pump problem?
A: Slow movements, weak digging force, abnormal noise, or overheating may indicate a hydraulic system or pump issue.

Q3: What warranty applies?

Warranty coverage and claim conditions depend on the quoted product option and must be agreed in writing before purchase.

Q3: How do I know if the pump needs replacement?
A: Check pressure, flow, and case drain according to the service manual. Replace the pump if testing confirms internal damage or performance outside specifications.

Q4: What can shorten the pump's service life?
A: Contaminated oil, restricted suction, overheating, and improper installation can accelerate wear.