1. Preparation: First, prepare the tools and materials required for replacement, including spanners, wrenching gloves, wrenching glove expansion rod, hydraulic oil pipe, hydraulic oil, work gloves, protective eyewear and so on.
2. Shut down the hydraulic system: before replacing the hydraulic pipe, be sure to shut down the excavator's hydraulic system, shut down the engine, and return the hydraulic operating elements to the neutral position with the manual control lever to prevent accidental startup and hydraulic element movement.
3. Drain the hydraulic oil: Before replacing the hydraulic pipe, you need to drain the hydraulic oil from the hydraulic system. Hydraulic fluid can be drained by opening the drain valve in the hydraulic system or by loosening the bolts on the hydraulic hose fittings.
4. Loosen the hydraulic pipe fittings: Using a spanner and spanner socket, loosen the bolts or nuts on the hydraulic pipe fittings. Be careful not to lose the bolts or nuts when installing new hydraulic lines.
5. Remove the old hydraulic hose: Carefully remove the old hydraulic hose from the excavator forearm. If the hydraulic hose is jammed or fixed to another part, gently undo it with a spanner or spanner socket extension.
6. Install the new hydraulic hose: Connect the new hydraulic hose correctly to the excavator's forearm, insert the hydraulic hose fitting and tighten the bolt or nut with a spanner or wrench. Ensure that the bolt or nut is tightened securely, but do not over-tighten to avoid damaging the hydraulic hose.
7. Fill the hydraulic oil: After replacing the hydraulic pipe, you need to refill the hydraulic oil. Use the appropriate hydraulic fluid according to the excavator's specifications and requirements, inject the hydraulic fluid into the hydraulic system and ensure that the hydraulic fluid is at the proper level.
8. Check and test: After installing the new hydraulic pipe, check the connections for leaks. Start the excavator's hydraulic system and observe whether there are leaks in the hydraulic pipe joints and pipes. If there are leaks, stop operation immediately and recheck and repair.
Replacing the excavator arm hydraulic hose requires care and adherence to the operator's manual and safety procedures. If you are unfamiliar with this operation or lack relevant experience, it is recommended to have a professional excavator repairer or technician perform the replacement and repair to ensure safe and proper completion.
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Release hydraulic system pressure:
Before replacing the hydraulic oil pipe, the hydraulic pressure in that hydraulic circuit must be released, and the following are the steps to release the pressure:
1. Park the machine on a level ground.
2. Fully retract the bucket cylinder linkage. Adjust the bucket position so that the bucket is parallel to the ground. Lower the movable arm until the bucket falls horizontally on the ground.
3. Shut down the engine
4. Turn the engine start switch to the ON position, but do not start the engine.
5. Push the left console down to the unlock position.
6. When the excavator pilot accumulator is in good working order, move the operating handle or pedal of only the hydraulic circuit requiring service to the full range position. This will release the high pressure in that single hydraulic circuit only.
7. After releasing hydraulic circuit pressure, pull the left side console to the locked position.
8. Turn the engine start switch to the OFF position.
9. Slowly loosen the filler plug on the hydraulic tank to relieve pressure. The filler plug should remain loose for at least 45 seconds. This will relieve any pressure that may be in the return hydraulic circuit.
10. Tighten the filler plug on the hydraulic tank manually, and tighten this bolt with a 30 sleeve when you have finished replacing the line.
11. The pressure in the hydraulic circuit is now relieved and the lines and components can be disconnected or disassembled.
Disassembly of hydraulic lines:
1.if there is an oil drain fitting installed on the hydraulic line, you can connect a hose and then loosen the oil drain fitting, the hydraulic oil in the line will flow through the hose to the container for storing waste oil.
2.Dismantle the fixing bolts of the oil pipe clamp, first loosen one bolt on the outside a little bit, then loosen another bolt on its diagonal, and loosen the four bolts in diagonal order until the oil pipe is loosened.
3.Unscrew one bolt in the middle of the fixing clamp, and disassemble one piece of fixing clamp and oil pipe connector.
4.After removing the hydraulic oil pipe, make sure the part number of the new oil pipe is the same as the part number on the oil pipe of the original machine, then you can install the hydraulic oil pipe, if you have any questions, please contact the relevant CAT professional.
Install the hydraulic oil pipe:
1. Make sure the seal of the oil pipe fitting is installed in place.
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2.Install the oil pipe fitting and fixing clamps, press the two pieces of fixing clamps firmly to ensure the oil pipe bends naturally, and then tighten the fixing bolts in diagonal order.
Add hydraulic oil and exhaust the hydraulic pump:
1.Check the hydraulic oil level, if there is insufficient oil level, it must be added to the normal oil level before using the machine.
2.If there is more hydraulic oil leakage due to the damage of hydraulic oil pipe, the hydraulic pump must be exhausting after adding hydraulic oil. Start the machine and lift the big arm and small arm to the highest point.
3.Loosen the plug or pump housing drain pipe at the top of the hydraulic pump housing. Turn the engine start switch to the on position, but do not start the engine.
4.Push the left console down to the unlock position. Do the big arm descending action, when the big arm will be descending to the ground, start the machine again to raise the big arm and small arm to the highest point.
5.Cycle this step several times to complete the hydraulic pump exhaust.
Which hydraulic hose to choose for excavators Excavators are a kind of mechanical products that are very familiar to excavator operators. Its required technical parameters include: hose diameter, length, inner diameter, material, connection material and so on. In order to ensure that the excavator can operate stably, the hose must have sufficient strength and pressure resistance and other characteristics. Hydraulic hose (hose) is made of rubber or polyvinyl chloride (PVC) material, according to different thickness and diameter to choose different materials to meet the excavator in different working conditions can be used for how long. The hoses can be divided into PVC hoses and polyvinyl chloride hoses. The hose has the adaptive ability and other characteristics and become the most commonly used materials by the excavator manufacturers, its performance is more excellent and very popular with the majority of customers. The following is a brief introduction to the different brands used in the hydraulic soft connection technical parameters (can be designed and produced by the manufacturer): excavators choose to use which hydraulic work piping system for the most applications for the flexible rubber soft joints.
1, with good temperature resistance and impact resistance and other characteristics
And its installation form is also very much, and can be installed in each part of the excavator. For example, the excavator's main engine and cab, air distribution room and so on. Rubber flexible joints are mainly used in the expansion pipe joints, because it facilitates the communication between the internal pipelines of the excavator, reducing the fatigue intensity of the staff in the construction. And the working temperature range is also very large (65-180 ℃). So that many brands pay great attention to it. Usually we are made of rubber, which has good temperature resistance and impact resistance and other characteristics. Can work at high temperatures, for the general case can withstand more than ℃ temperature, abrasion resistance can reach more than times; so it can be said to be the most used material in the excavator, and the performance is very superior! Under normal circumstances are able to withstand 100 kg object impact and vibration it can be destroyed and will not be affected by the role, so it is a very safe material; in different working conditions under the most use, it can be connected to the concrete or metal structure and other pipelines and axial displacement and compressive stress; and for the noise also has a very good role in isolation which can also be installed in the machine to play a very good effect, and better play a protective role. This can also be installed on the machine to play a very good effect, better protection and buffer function. Can meet the excavator in the work of any problem will not affect the normal operation of other machines so that flexible rubber joints is also a very popular material; and it also has a seismic, noise and other performance characteristics, long service life, thus reducing the failure rate of the excavator and make the working environment more comfortable and safe, the service life has been extended. The scope of use is very wide and favoured by users! It is also because of these features to make flexible rubber coupling in the excavator industry has a very high degree of application and widespread, but we have to pay attention to some matters when it is used: in the hydraulic pipeline are generally used in two different materials, and connect the form of different flexible hoses and fittings belonging to the hose couplings. Which can be based on the user's actual needs to design the installation rather than in accordance with certain provisions and ways to determine its strength, hardness and so on! Because each manufacturer will be based on the user's specific needs to produce a better and more suitable for their use and longer life Oh ~ Here we come to a detailed introduction to the rigid rubber hose connector and pipeline connection should pay attention to what problems: after installation
2、Effectively avoid vibration of excavator in long time operation
In the process of using, need to pay attention to some matters: first of all, according to the specific working conditions of the excavator to choose the appropriate hose. The installation height of the hydraulic hose should not exceed 5 cm. In addition, when installing the hose, be sure to weld the hose construction, do not use welding tools, so as not to damage the hose. Before use, be sure to check whether the hose has rupture or deformation and other conditions. Because this time if there is a break in the soft joint will affect the normal operation of the excavator. The second thing is to check whether the working pressure of the hydraulic system is too high. Too high or too low pressure will cause considerable damage to the excavator. Therefore, you should choose a reliable hose manufacturer for manufacturing. It is also necessary to check whether there is any damage, and if there is any damage, it should be replaced and repaired in time.
3, flexible rubber hose coupling and excavator frame connection is convenient for maintenance and not easy to deform.
1, soft connection material: different brands have different quality requirements. General PVC material is the best choice, with good impact and abrasion resistance; high temperature, corrosion has a certain resistance; price is also relatively moderate (according to different models).
2, flexibility: soft connection material with supple characteristics, good wear resistance, long service life; softness, can be directly in contact with the body; and will not rupture; better elasticity, good elasticity and abrasion resistance, and can be designed according to the need for a variety of performance; better sealing, not easy to leak, good oil resistance. Its shortcomings are also obvious, there is a little bad is easy to absorb water, especially in the hot season easy to aging, cracking and other phenomena; rubber flexible joints are mainly for the excavator to do joints to protect the role; and for the waterproof requirements of the user will affect the service life, so pay attention to the process of use to avoid the damage it will produce some losses.
3, pressure resistance: its elasticity can withstand the working pressure (generally working pressure) up to 5 times the rated pressure; can withstand the working temperature -40 ℃ ~ 70 ℃ under the working temperature, and allows the working temperature of 0 ℃ ~ 100 ℃; can withstand the impact and vibration strength (normal operation) of 3 MPa ~ 7 MPa between; modulus of elasticity of 480 MPa or so. Therefore, it can show its good pressure resistance performance under different working conditions. It will not react with mechanical oil or other oil substances in contact with the surrounding impact is very small, in the work can not be lubricated. If it is oil, it will release a small amount of gas oxidation and make the hose deformation, bending and deformation phenomenon or aging. In addition, the hose also need to have a certain buffer and waterproof performance, in order to avoid damage due to contact and loss. 4 rubber joints were composed of multiple connectors (designed by the manufacturer); rubber joints and excavator frame connection can reduce unnecessary loss; and softness can reduce the damage caused by the machine: for the excavator, the rubber soft joints also has good elasticity and shock absorption performance. Flexibility can reach
4, at the same time with good corrosion resistance and cushioning, when the excavator bucket rotates at a large angle when the hose will not have obvious wear and tear.
The high elasticity of the rubber hose itself is also a key factor to ensure the operation of the excavator. Because it can be adapted to the bucket's large-scale movement without friction because of the soft rubber cushion and lead to increased wear and tear. This also leads to a new type of equipment widely used in the domestic market - excavators. Hydraulic flexible joints used in a wide range of industries, and in many industries can see the wide application of hydraulic flexible joints. Nowadays, many excavators choose to use this kind of connector to do to waterproof, dustproof and anti-vibration role. If there is water leakage in the equipment will lead to the machine can not continue to work and cause accidents. Especially when the working environment is poor, it will lead to excavators appear to stop, flameout, and even can not work and other failures, in the mechanical service life has a very big impact, then in the replacement of hydraulic flexible joints must pay attention to try to pick some brand quality products, because in the choice of hydraulic flexible joints, many users in the purchase of the time to ignore this point. Lead to the selection of poor quality products for fault repair at the same time also brought great damage to the excavator users. How to choose? Here is a detailed description of how to do it?
5, its joints can withstand high pressure (hydraulic system working pressure), can absorb vibration and reduce noise.
If not compensated, the hose will be limited in installation and have an impact on its life. However, these couplings are durable and do not leak. For high strength and long service life systems can be completed in a short period of time. Flexible rubber soft joints are connected together by rubber parts and metal elements. With a large contact surface, can withstand high pressure and corrosion resistance characteristics, at the same time has a certain degree of elastic deformation capacity and good flexibility and other characteristics. In withstand high pressure characteristics will not occur when the displacement of elastic deformation, reduce equipment operating resistance and noise will not cause vibration. Can be used for bending, axial displacement and other deformation and expansion, rotation and fixed position changes and other actions. At the same time can also play a role in damping the role of elastic components and filler materials, lining, elastic components, rubber and so on. Such as: can be used to compensate for the mutual rigidity of the connection between the moving equipment and connecting parts, such as: springs, shock absorbers, bearings, etc.; also used for pipeline connections, such as: connectors. If you need to apply different specifications or thicknesses of rubber joints on excavators to improve their life and reduce the working intensity of excavator operation.
1.High-pressure hose: High-pressure hose is mainly used in the hydraulic oil circuit of excavator to withstand high pressure and high temperature, and can resist the erosion of various chemicals. High-pressure hose is generally composed of steel wire braid layer and oil-resistant rubber to ensure its strength and sealing performance.
2. Right-angle hose: Right-angle hose is mainly used in the hydraulic system of excavator which needs right-angle connection, such as the connection between hydraulic cylinder and valve. Right-angle hose can be bent into different angles to adapt to the needs of different positions.
3. Multi-functional hose: multi-functional hose has a variety of functions, such as high pressure, vacuum, sewage and so on. This kind of hose generally consists of several joints with different functions, which can be easily connected with various different excavator parts.
4. Oil-resistant hose: Oil-resistant hose is mainly used for the transport and recovery of hydraulic oil. This kind of hose has good oil resistance and sealing performance, which can ensure the purity of hydraulic oil and the normal operation of the system.
5. air hose: air hose is mainly used for compressed air delivery and recovery. This kind of hose is generally made of rubber and fabric reinforced materials, with high strength, high temperature and oil resistance, etc., which can ensure the purity of air and the normal operation of the system.
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