ZX490 ZX490LCH-5A Crawler excavator Bucket cylinder assy for hitachi excavator

ZX490 ZX490LCH-5A Crawler excavator Bucket cylinder assy for hitachi excavator

Special working principle of multi-stage oil cylinder
For working conditions that require long travel but limited installation space, excavators may use multi-stage telescopic hydraulic cylinders 311. This type of oil cylinder consists of multiple sleeve type pistons, which extend or retract in a specific order during operation. The working principle of multi-stage oil cylinders is based on the difference in effective area of each piston section: when extended, the base piston with the largest area moves first because it requires the lowest oil pressure under the same load; Subsequently, the second stage piston with the second largest area moves; Finally, the final piston action with the smallest area is 816. When retracting, the opposite is true, with smaller pistons retracting first and larger pistons retracting later. This ordered sequence of actions ensures that multi-stage hydraulic cylinders achieve long stroke motion within a limited space.

The control complexity of multi-stage oil cylinders is higher than that of single-stage oil cylinders, as it requires coordinating the movement sequence and speed of pistons at all levels. In modern excavators, multi-stage hydraulic cylinders are commonly used in situations that require particularly long strokes, such as certain specially designed excavator boom systems. Although the structure is complex and the cost is high, multi-stage hydraulic cylinders solve the contradiction between installation space and working stroke, demonstrating the design flexibility of hydraulic technology.

List of spare parts

FAQ:

1. If I only know the excavator model, but can not offer parts No., what should I do ?
If possible, you can send us pictures of old products, nameplate or the size for reference.
2. What is the warranty of the parts after I purchased?
The warranty is 6/12 Months based on the item details.
3. How can I pay the order?
We can receive payment through T/T, Paypal(for small amount),Alibaba trade assurance.
4. When will get the items after I place order?
Once your payment is confirmed, we will arrange the goods within 24 hours; if not in stock , we will inform you before placing the order.
5. How can I do if there is something wrong with the items?
First of all , I have confidence in the quality of our products ,if you really found something wrong ,pls provide pictures for us and we will check. After it is confirmed, pls return to us , we will offer the correct item.
6. What is your main products ?
We are specialized in the excavator spare parts, such as travel motor gearbox/ass’y/parts, swing gearbox/ass’y/motor/parts, hydraulic pump assy/parts and gear parts. If you need other excavator parts, we also can supply as your requirements.