Product Video
Products Description
|
Brand |
Product Name |
Model |
Weight/pc |
Part Number |
|
Caterpillar
|
Boom cylinder | 2254523 | 402.25 Kg |
21N-30-00120 |
We supply all models of komatsu excavator track roller. If you need to know other models, please contact us.
|
Product Name |
cat boom cylinder |
|
Part Number |
2254523 |
|
Origin |
United States |
|
Brand Name |
STONE |
|
Model |
349D |
|
Price |
Negotiable |
|
Packing Details |
Standard Export Packing |
|
Delivery Time |
0-30 Days |
|
Payment Term |
L/C, T/T |
|
Price Term |
FOB, CIF, CFR |
|
Supply Capacity |
50,000 PCS/Month |
|
Minimum Order Quantity |
1 PC |
|
Material |
High Quality Steel |
|
Technology |
Precision Machining |
|
Surface |
Treatment Anti-Corrosion Coating |
|
Hardness |
HRC 48-52 |
|
Quality |
Original Factory Standard |
|
After-Sales Service |
Full Support, Online Service |
|
Color |
Customizable |
|
Application |
Excavator
|
|
Customizable |
including customized materials, surface treatment and specifications |
Product related information
Cat 349D excavator
Specifications:
Engine Power：283kw
Operating weight (kg)：46285kg
Track
Track Gauge:2740mm
Shoe Size:750mm
Number Of Track Rollers Per Side:8
Number Of Carrier Rollers Per Side:2
Number Of Shoes Per Side:49
STONE : Product Advantages
 |
 |
Compatible with the following machinery:
| 345C | 345D |
| 349D | 3512 |
390D L Hydraulic System Specification
| Main System-Maximum Flow(Total) | 734L/min | 194 gal/min |
| Maximum Pressure-Equipment-Normal | 35000kPa | 5075psi |
| Maximum Pressure-Travel | 35000kPa | 5075psi |
| Maximum Pressure-Swing | 31400kPa | 4550psi |
| Pilot System-Maximum Flow | 43L/min | 11.4gal/min |
| Pilot System-Maximum Pressure | 4110kPa | 595psi |
| Boom Cylinder-Bore | 160mm | 6.3in |
| Boom Cylinder-Stroke | 1575mm | 62in |
| Stick Cylinder-Bore | 190mm | 7.5in |
| Stick Cylinder-Stroke | 1778mm | 70in |
| HB2 Family Bucket-Bore | 160mm | 6.3in |
| HB2 Family Bucket-Stroke | 1356mm | 53.4in |
| JC Family Bucket-Bore | 170mm | 6.7in |
| JC Family Bucket-Stroke | 1397mm | 55in |
Production process
Material Selection
The boom cylinder is manufactured using precision machining processes. The cylinder barrel is made of Grade 20 or 45 seamless steel pipe, while the piston rod is made of 40Cr or 38CrMoAlA material.
01
Fatigue Resistance
The inner wall of the cylinder barrel is finished using a honing or rolling machine, reducing the surface roughness to below Ra0.4 and forming a cold worked hardened layer to enhance fatigue resistance.
02
Surface Treatment
The surface of the piston rod is treated with hard chrome plating with a thickness of 0.05–0.1 mm. After plating, grinding is performed to remove burrs.
03
Non-destructive Testing (NDT)
All welds are inspected using ultrasonic testing (UT) or radiographic testing (RT) to ensure compliance with the requirements of JB4730 Standard: Level I for ultrasonic testing and Level II for radiographic testing.
04
Product advantages
|
This system allows either of the two hydraulic pumps to utilize 100% of the engine power, ensuring sufficient power output under all operating conditions. |
Electronically controlled and managed by the machine ECM, it improves cycle times and fuel efficiency, increasing productivity and reducing operating costs. |
Cushions are located at the rod end of the boom cylinder and at both ends of the stick cylinder. They reduce shock, lower noise levels, and extend the service life of components and structures. |
The hydraulic system provides automatic priority for boom lift and swing operations. There is no need to frequently use the mode selection button; the system automatically prioritizes these functions based on operator input. |
Precautions for use
Hydraulic Oil Requirements
The viscosity of the working oil should be 29~74 mm²/s, and the operating oil temperature is best kept within the range of -20~80℃. The system filtration precision must not be lower than 80 μm. Strictly control oil contamination, maintain oil cleanliness, regularly inspect oil performance, and replace the hydraulic oil in a timely manner.
Installation Notes
During installation, the orientation of the joint on top of the piston rod should align with that of the cylinder head and the trunnion/earring, and the straightness of the entire piston rod during extension and retraction must be ensured to prevent rigid interference and unnecessary damage. Before use, the cylinder must be bled of air under low pressure and low speed, moving it back and forth about twenty times to fully expel excess air.
Maintenance
Regularly check for leaks, wear, or damage, and replace seals as scheduled. Use the recommended hydraulic oil and add an appropriate amount to ensure smooth operation. Before disassembly, first loosen the relief valve to reduce pressure in the hydraulic circuit to zero, then cut off the power supply and stop the hydraulic syst
STONE
Stone is a leading supplier of engineering machinery parts, focusing on providing high-quality parts for mining companies. Since its establishment in 2004, we have been based in Shanghai, China, and have built our own brand STONE, becoming a trusted choice in the industry. We are committed to providing a variety of parts including bulldozers, excavators and wheel loaders for well-known brands such as Caterpillar and Komatsu. Our product line covers a full range of OEM parts, such as Track Chain, Track Rollers, Sprocket, Excavator Buckets, Blades, Excavator Cylinders, Swing Circles, and various electrical and hydraulic components to ensure that our customers' stringent requirements for quality and performance are met.
quality
years experience
service
hours warrant
Q＆A
What causes weak boom operation?
It may be due to severe wear of the piston seals inside the cylinder, causing internal leakage of hydraulic oil and preventing the cylinder from generating sufficient thrust. It could also be a hydraulic pump malfunction resulting in insufficient flow and pressure of the output hydraulic oil. The seals and hydraulic pump should be inspected promptly and replaced if necessary.
What causes boom drift (unintended lowering)?
This is usually related to damaged oil seals in the cylinder. Once the seals are damaged, hydraulic oil leaks through the poorly sealed areas, making it impossible for the cylinder to maintain stable pressure. It may also be caused by a malfunctioning boom counterbalance valve, such as a stuck valve core or a failed spring. The oil seals and counterbalance valve should be inspected, and any damaged parts should be replaced in a timely manner.
What should I do if the hydraulic oil overheats and triggers an alarm?
You should inspect and clean the radiator, check the tightness of the fan belt, use the appropriate hydraulic oil, avoid prolonged overloading, inspect and adjust the hydraulic system pressure, inspect and repair hydraulic components, install a dust screen, and check the air ducts.
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