JS200 400C818 Arm cylinder assy hydraulic cylinder for JCB Crawler excavator

JS200 400C818 Arm cylinder assy hydraulic cylinder for JCB Crawler excavator

Working cycle of double acting oil cylinder
Excavators commonly use double acting hydraulic cylinders, which are characterized by pressure oil flowing into both sides of the piston, achieving bidirectional active motion control. Its working cycle can be divided into two stages: extension and retraction. In the extension stage, the pressure oil enters the rodless chamber, while the oil in the rod chamber returns to the oil tank, and the piston rod extends outward; In the retraction stage, the pressure oil enters the rod chamber, and the oil in the rodless chamber returns to the oil tank. By precisely adjusting the inlet and outlet directions and flow rates of the two chambers through control valves, precise control of various complex movements of excavators can be achieved.

An important working mode of the double acting hydraulic cylinder is differential connection, which means that both chambers of the cylinder are simultaneously connected to pressure oil 816. Due to the larger effective area of the rodless chamber compared to the rodless chamber, the piston will move towards the rodless chamber while replenishing the oil in the rodless chamber, creating a "differential" effect. This connection method can increase the movement speed of the piston (but correspondingly reduce the output force) without increasing the pump flow rate, and is commonly used in scenarios where excavators need to quickly approach working conditions with no load. Differential connection is a typical application of energy-saving design in hydraulic systems.

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

Excavators are heavy machinery widely used in various fields such as construction, engineering, and mining. The main application areas include:

Construction engineering: Excavators are used for excavating foundation pits, cleaning sites, excavating underground facilities, foundation construction, etc.

Mining: In mines, excavators are used for mining ores, transporting materials, stripping topsoil, and crushing operations.

Water conservancy engineering: In water conservancy construction, excavators are used to excavate rivers, clear lakes, build dams and canals, etc.

In the field of agriculture, excavators are sometimes used to cultivate land, dig water channels, and construct irrigation systems in large-scale agricultural production.

Forestry: used for logging, clearing forest paths, clearing trees, and transporting timber.

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.