How to Bleed Air from Excavator Hydraulic Pump - Kyotechs
Understanding Hydraulic Systems
Hydraulic systems power modern excavators, facilitating robust and precise movements necessary for excavation work. Air within these systems interrupts hydraulic flow, leading to diminished power and potential damage. At Kyotechs, we understand that maintaining hydraulic system integrity is crucial for the functionality of your equipment. Established in 2009, Kyotechs has been a trusted provider of high-quality excavator parts, serving brands such as Hitachi, Sany, Kawasaki, Volvo, Hyundai, Doosan, Komatsu, Caterpillar, Case, and Kobelco.
Why Regular Maintenance is Crucial
Regular maintenance of your excavator's hydraulic system ensures continuing operational efficiency and longevity. Air pockets, often introduced during component replacement or repairs, can cause erratic or inefficient system performance. By following our guide, you'll be equipped to handle this potential disruption with confidence.
Step-by-Step Guide to Bleed Air from Excavator Hydraulic Pump
Step 1: Safety First
Ensure your excavator is on firm, level ground and that it is turned off. Wear appropriate personal protective equipment (PPE) before starting to avoid any potential hazards.
Step 2: Secure the Excavator
Securely place the excavator bucket or arm on the ground to prevent any movement that might result from the removal of air pockets.
Step 3: Locate the Bleed Points
Consult your excavator's manual to locate the designated bleed points on the hydraulic pump. These points allow trapped air to escape from the system.
Step 4: Prepare for Bleeding
Gather necessary tools, such as wrenches and a suitable container to catch any hydraulic fluid, preventing unnecessary spillage and environmental contamination.
Step 5: Begin the Bleeding Process
Loosen the bleed valve while keeping a close eye on any escaping air or fluid. Allow the system to naturally expel the air by gravity or air gun. Avoid any force that might damage the system components.
Step 6: Monitor Hydraulic Fluid Levels
As air is expelled, hydraulic fluid levels may drop. Continuously monitor and replenish the fluid to manufacturer-recommended levels to maintain system integrity.
Step 7: Test the Excavator
After the bleeding process is complete, test the excavator to ensure smooth and efficient operation. Look for indicators of trapped air such as noise or jerky movements.
Tips for Maintaining Hydraulic System Efficiency
- Regular Checks: Frequently check hydraulic fluid levels and bleed the system as part of regular maintenance.
- Use Quality Fluids: Ensure you're using high-quality hydraulic fluids that meet your manufacturer’s specifications.
- Timely Replacement: Replace hydraulic filters regularly to prevent contamination and prolong component life.
FAQs
Q1: How often should I bleed air from the hydraulic pump?
Regular bleeding should align with your maintenance schedule or after any repair that involved opening the hydraulic system.
Q2: What are the signs of air in the hydraulic system?
Noises such as knocking or hissing, along with erratic or delayed mechanical movements, indicate trapped air.
Q3: Can I bleed the hydraulic system myself, or should I consult a professional?
Following this guide, the process can be safely executed by yourself unless specific issues or complex systems necessitate professional expertise.
Conclusion
Maintaining your excavator's hydraulic system is essential for optimal performance and longevity. By knowing how to bleed air from an excavator hydraulic pump, you protect your machinery from potential damage and maintain peak efficiency. At Kyotechs, we are committed to providing exceptional support and parts for your excavator needs, offering a full range of quality components and repair solutions. Since our establishment in 2009, we've been synonymous with reliability and expertise in heavy machinery maintenance. Trust Kyotechs to guide you in maximizing the performance and lifespan of your equipment.
About Kyotechs
Kyotechs, established in 2009, offers an extensive range of excavator parts for leading brands such as Hitachi, Sany, and Caterpillar. Our comprehensive product lineup includes engine assemblies, hydraulic pumps, control valves, electric parts, and more. We are committed to providing one-stop solutions for excavator and engine repairs, ensuring that your machinery remains in top operational condition. Choose Kyotechs for quality, reliability, and expertise in excavator solutions.
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FAQS
What should I pay attention to when assembling a gear pump?
The pump housing will wear more in the oil inlet chamber. If the pump housing is symmetrical, it can be turned 180 degrees. Then use it. For the passive gear, the two ends cannot be replaced. Make a mark when removing it. Because the gear will wear on one side. The active gear is integrated with the rotating shaft and cannot be turned over; turning the passive gear over can change the contact point of the meshing line of the two gears. After the pump is assembled, add a little lubricating oil and rotate it slightly by hand. The feel should be smooth.
What is the reason for the cylinder pulling in the excavator engine?
Reasons from the piston group
1. The piston ring gap is too small. If the opening gap, side gap or back gap of the piston ring is too small, the piston ring will be stuck due to heat expansion when the engine is working, and it will be pressed tightly against the cylinder wall, or the piston ring will be broken, which can easily pull out grooves on the cylinder wall.
2. The piston pin is out. Because the piston pin retaining ring is not installed or falls off or breaks, the piston pin will be out during movement, which can easily damage the inner wall of the cylinder and cause the cylinder to blow into the crankcase.
3. The piston cylinder gap is too small or too large. If the piston material is poor, the manufacturing size error is too large, or the piston is deformed after the piston pin is assembled, the matching gap between the piston and the cylinder is too small, and the piston is stuck after heat expansion, which will then damage the cylinder wall.
4. The piston ring is seriously carbonized. Excessive carbon deposits cause the piston ring to stick or bite in the ring groove. At the same time, carbon deposits are a hard abrasive that will grind into longitudinal grooves on the cylinder wall.
5. The piston is seriously off-cylinder. Due to the bending and twisting of the connecting rod, the parallelism and coaxiality deviations of the connecting rod journal, main journal, and piston pin seat are too large, causing the piston to be significantly off-cylinder, which will accelerate the wear of the piston ring, piston and cylinder wall and destroy the formation of the oil film.
Reasons for cylinder sleeves
1. The roundness and cylindricality tolerances of the cylinder sleeves exceed the allowable range, which greatly reduces the sealing of the piston and cylinder sleeves. The high-temperature gas in the cylinder flows down, destroying the oil film between the piston and the cylinder wall, and then causing cylinder pulling.
2. The cylinder sleeve is deformed during the assembly process. For example: the protrusion of the upper end surface of the cylinder sleeve is too large, and the cylinder sleeve is deformed after the cylinder head is installed; the cylinder sleeve water blocking ring is too thick, and the cylinder sleeve is deformed after being pressed into the body, which can easily cause cylinder pulling.
Reasons for use:
1. Whether the size of the cylinder sleeve used during assembly does not match the cylinder body and piston.
2. The air filter is not sealed, which makes the filtering effect worse. Dust, sand and other impurities in the air are sucked into the cylinder, forming abrasive wear. Tests show that if a few grams of dust are sucked in every day, the wear of the cylinder liner will increase by more than 10 times.
Which oil level is the most suitable for the oil cylinder?
There are usually the highest and lowest oil level marks (MAX and MIN) on the inner wall of the oil filling port of each engine. This means that the oil level cannot exceed MAX or be lower than MIN.
A lower oil level, that is, a decrease in the amount of oil in the engine, will increase the oil load, causing the oil to become more seriously contaminated by heat, which not only weakens the lubrication performance, but also increases the fuel consumption. Because the less oil in the engine, the higher the oil temperature; and the higher the oil temperature, the greater the fuel consumption will be as the oil temperature rises. It is very dangerous to run the engine when the oil level is at the lowest point (MIN).
Keeping the oil level at the highest point (MAX) all the time will cause the oil to foam and lead to insufficient lubrication, resulting in serious wear. Foaming oil will also increase fuel consumption.
Therefore, it is recommended to keep the engine oil level between the MAX and MIN marks at a position close to one-third of the MAX.
What kind of battery is used in the excavator? Why?
The batteries we use are all lead-acid batteries for starting. Because this type of battery has the characteristics of large starting current and can meet the power supply requirements of the starter motor.
How to maintain the excavator's air filtration system?
Regularly check and replace air filters, clean the air filter housing, ensure the intake lines are not clogged, and inspect the air filtration system for proper sealing to prevent dust from entering the engine.
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