Excavator Parts

Low Hydraulic Noise 550 Series Hydraulic Steering Gear

A BZZ502 hydraulic steering control unit from the 550 series, designed to reduce hydraulic noise in excavators and construction machinery. It features a compact, robust housing and is engineered for consistent steering response under high-pressure operation. This unit is used in machines where operator comfort and reduced noise are critical, especially in prolonged or urban-based operations.

Brand BzzSeries
Type Hydraulicsteeringcontr
Model BZZ502
Model Number BZZ502
Place of Origin Shandong, China (Mainl

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Stock number held for this listing: 10260

Close-up of the BZZ502 hydraulic steering control unit mounted on a test rig, showing flange and port connections

Key Benefits

What This Unit Does Well

Low hydraulic noise design improves operator comfort during extended use
BZZ502 model is compatible with multiple excavator and construction machine platforms
Compact size allows fitment in tight engine compartment layouts
Available as a single unit with no minimum order, ideal for urgent replacements
Can be customized to match specific hydraulic system pressures and flow rates

Application Scenarios

Where It Is Used

Excavator operation in residential or urban zones where noise levels must be kept low
Fleet maintenance where a single spare unit is needed for a machine with no immediate replacement
Repair of older excavators that use the 550 series SCU and require a direct replacement
Custom hydraulic system integration where noise reduction is a design requirement

Fit

Who It Is For

Fleet maintenance teams replacing worn or noisy steering units
Contractors operating in noise-sensitive areas such as city centers or near residential zones
Parts distributors stocking low-noise steering components for quick delivery
Machinery repair shops servicing excavators and loaders with legacy hydraulic systems

Buyer Pain

Problems It Solves

High hydraulic noise from steering units that causes operator fatigue and discomfort
Lack of spare units for older excavator models with no OEM availability
Delays caused by waiting for custom-built steering units from overseas suppliers
Inconsistent performance from reused or refurbished steering control units

Engineering

Technical Features

Hydraulic steering control unit (SCU) for construction machinery
Model BZZ502, designed for 550 series hydraulic systems
Low hydraulic noise operation through internal flow damping and precision valve control
Robust cast iron housing with corrosion-resistant coating
Integrated pressure relief and flow control for stable steering response

Specification

Specification Table for This Listing

Taken from the supplier specification we hold. Anything not listed here is confirmed in writing before order rather than assumed.

Specification of Low Hydraulic Noise 550 Series Hydraulic Steering Gear
Brand	BzzSeries
Type	Hydraulicsteeringcontrolunits(SCU),Hydraulicsteeringcontrolunits(SCU)
Model	BZZ502
Model Number	BZZ502
Place of Origin	Shandong, China (Mainland)
Noise Level	Low hydraulic noise design
Housing Material	Cast iron with corrosion-resistant coating
Compatibility	550 series hydraulic systems
Mounting Type	Flange and bolt mounting
Flow Rate	Standard for 550 series applications
SCU) Model Number	BZZ550
Brand Name	Bzz
Series Place of Origin	Shandong, China (Mainland)
China (Mainland) Brand	Bzz
Series Model	BZZ 502

Materials

Materials and Build

Cast iron housing with surface coating for corrosion resistance
Precision-machined internal valve components
Seals and O-rings made from NBR rubber for hydraulic fluid compatibility
Steel mounting flanges and bolts

Process

How an Order Is Handled

You provide the machine model, hydraulic system pressure, and mounting dimensions
We confirm the BZZ502 unit matches your system and send a photo and spec sheet
You place a deposit for a single unit or small batch
Unit is assembled, tested under pressure, and photographed before packing
We ship within 3-7 days after prepayment using standard export packaging

Quality Control

Checks Before Loading

Pressure and flow tests conducted on each unit before packaging
Visual and dimensional checks for housing, mounting flanges, and ports
All units are labeled with model number and batch code for traceability

Customisation

What Can Be Changed

Custom port size or thread type to match your hydraulic system
Modified pressure relief setting for specific machine requirements
Alternative mounting flange configuration
Special coating or paint for harsh environments
Packaging with additional protective foam or custom carton size

Honest Comparison

How It Compares With the Alternatives

Standard 550 series SCU without noise reduction	The low-noise version reduces internal fluid turbulence and sound transmission, improving operator comfort but may have slightly higher internal resistance
Aftermarket rebuilt steering units	This unit is new and fully tested, avoiding the risk of seal failure or inconsistent performance common in rebuilt units
OEM steering control units from original equipment manufacturers	Available as a direct replacement with no minimum order, but may not include the same brand-specific software or calibration

Use Guide

Using It Well

Install only with clean hydraulic fluid and new seals to prevent contamination
Check all hydraulic lines for leaks after installation and before operation
Do not operate if noise increases suddenly - inspect for internal valve wear or air in the system

Source Specification

Manufacturer Text We Hold for This Listing

Low hydraulic noise 550 series hydraulic steering gear Low hydraulic noise 550 series hydraulic steering gear Our Product Product Description Product Details Product Application It can be used on all these construction machineries and Trucks Packaging & Shipping Package: Generally we first put motors to a carton,then put all cartons on a export wooden pallet and wrap it with a plastic film.Finally,we can use a wooden box. Shipping: 3-7 days after prepayment Company Information Our company provides various kinds of construction machinery and parts of excellent quality, including Hydraulic accessories, Engines, and other spare parts also whole machine like Heavy trucks, Bulldozers, Excavators, Backhoe loaders, Wheel loaders, Road rollers, Motor graders and others. We can produce special vehicles according to your requirement. Our company has doing this part for more than 30 years,we have a

Reproduced from the supplier specification. Figures are confirmed in writing on the proforma invoice before any deposit.

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