Excavator Seal Kit

A comprehensive list of common issues with excavator seals

Before answering common questions about excavating seals, Tianjin Parker Seals will tell you what engineering machinery excavators, also known as excavation machinery or excavator seals, are earthmoving machinery that excavates materials above or below the bearing surface with a bucket and loads them into transport vehicles or unloads them into a storage yard. The materials excavated by excavators mainly include soil, coal, sediment, as well as pre loosened soil and rocks. The most commonly used seals for excavators in my work include dust seals (DKB), hole combination seals (SPGO, SPGW), heavy-duty hole combination seals (SPG), shaft seals (SPNO, SPNS), heavy-duty shaft seals (SPN), etc. The main sealing components include buffer rings (HBY, HBTS) and anti fouling sealing rings (KZT).
So, what are the sealing problems with the most common excavator seals in daily life?

 Q: What are the types of seals for excavator oil cylinders?
Answer: The hydraulic cylinder of a hydraulic excavator includes three main parts: boom cylinder, boom cylinder, and bucket cylinder, with four major cylinders. Due to the direct control of the working device by each oil cylinder, it frequently reciprocates over a large thrust range to achieve its motion, and most of them have no outer protective devices, resulting in a high failure rate in the entire hydraulic system., The seals of different components of the oil cylinder are different, mainly including Glay rings, O-ring seals, and dust seals of different sizes. It is recommended that you determine the size of the car and the oil seal of that component.

2、 Q: What are the seals inside the excavator?
The excavator includes various types of hydraulic cylinders, proportional valves, distribution valves, pressure valves, hydraulic pumps and other hydraulic oil system seals, as well as seals for non hydraulic oil systems such as engines and transmissions
3、 Q: Does the sealing element (oil seal) need to be sealed with sealant when installing (replacing) excavators?
Answer: In most seals (oil seals), no sealant is applied. Of course, except for some special parts. If the sealing is not tight, we can consider using a combination of sealing components and sealant (588 sealant).
4、 Q: Is the excessive sealing of the excavator engine hood due to high temperature?
Answer: There are many reasons for the problem of high water temperature, and not making any changes to the engine hood would not cause high temperatures. Check the belt, water level in the water tank, and whether there is any bubbling in the water tank. The problems with the engine are not small. Long term high temperatures can greatly affect the engine's lifespan.
5、 Q: What are the excavator seal repair kits? How to classify it?
Oil cylinder repair kit; Main pump repair kit; Engine repair kit; Basically, there are three types of seal repair kits.
6、 Question: The rotary pump of the excavator seal is leaking oil! What should we do_
Reasons and solutions for total oil leakage in the rotary pump of excavator seals:
1. The seal is aging. The seal needs to be replaced.
2. The hydraulic oil seal of the excavator rotary motor is leaking oil, and the hydraulic oil is leaking into the gearbox. The hydraulic oil seal of the rotary motor needs to be replaced.
3. Excessive addition of oil. Need to reasonably control the amount of fuel added
Attention: Oil leakage must be replaced. Short term excavator operation will not have an impact, but over time it may lead to wear of the slewing support. Knowledge point extension: The rotary pump of an excavator relies on the rotation of one or more rotors inside the pump to suck in and discharge liquid, also known as a rotary pump
7、 Q: What is the name of the seal on the excavator arm? Where can I buy it?
Are the two sides of the pin at the connection between the shovel and the oil shovel called O-rings? Answer: If it is a rubber ring that plays a sealing role, its scientific name should be called "packing oil seal", and in plain language, it should be called a seal; If it is a steel clamp ring at both ends of the pin, it is called a "0-type clamp spring";
8、 Q: How to solve the problem of excavator pressure relief?
Answer: First of all, we need to determine which types of situations excavator pressure relief can be classified into, and solve the problem you encounter according to the actual situation
1. Manufacturing and assembly factors: All hydraulic components and sealing parts of excavators have strict requirements for dimensional tolerances, surface treatment, surface smoothness, and form and position tolerances. If there is a deviation in the manufacturing process, such as the piston radius of the oil cylinder, the depth or width of the sealing groove, the size of the hole for installing the seal exceeding the tolerance, or the out of roundness caused by processing problems, the part itself will have
There are congenital leakage points that occur after assembly or during use.
2. Assembly factors: Rough operation should be avoided during the assembly of hydraulic components. Excessive force may cause deformation of the parts, especially when using copper rods to strike the cylinder body, sealing flanges, etc; Before assembly, the parts should be carefully inspected. During assembly, the parts should be dipped in a small amount of hydraulic oil and gently pressed in. Diesel fuel should be used for cleaning, especially rubber components such as seals, dust rings, O-rings, etc. If gasoline is used, they are prone to aging and lose their original elasticity, thereby losing their sealing function.
If gasoline is used, the components are prone to aging and lose their original elasticity, thereby losing their sealing function.
4. Design factors: The reliability of excavator hydraulic systems largely depends on the design of hydraulic system seals and the selection of seals. Due to the unreasonable selection of sealing structures and non-standard selection of seals in the design, the compatibility type of hydraulic oil and sealing materials, load conditions, ultimate pressure, working speed, and changes in ambient temperature were not considered in the design.
These all directly or indirectly cause hydraulic system leaks to varying degrees. In addition, due to the inevitable presence of dust and impurities in the working environment of excavators, appropriate dust seals should be selected in the design to prevent dust and other contaminants from entering the system, damaging the seals, contaminating the oil, and causing leaks.
9、 Q: How to install the seal of the excavator plate overflow valve?
Answer: Flow valve is a hydraulic pressure control valve that mainly plays a role in constant pressure relief, stabilizing pressure, system unloading, and safety protection in hydraulic equipment.
Disassembly steps: 1. Unscrew 4 bolts. 2. Remove the pilot valve body. 3. Unscrew the handle nut and use the I5 screw to screw in and remove the pilot valve core, gasket, and spring. 4. Remove the lower part of the main valve body spring and main valve core Assembly process: Pay attention to the integrity of the O-ring. During assembly, install the main valve core, spring, etc. into the valve body in the above order, and use your fingers to slide the valve core up and down freely. 2. Place the valve core, gasket, and spring into the pilot valve body in sequence. 3. Rotate the handle nut out to the front position, screw it into the pilot valve body, and tighten it with a wrench

10、 Q: Is it easy to replace the high-pressure oil pump seal of the excavator?
Answer: The high-pressure oil pump of excavators is a variable displacement piston pump, and the seal itself is easy to replace. However, once the piston pump is disassembled, it is easy to encounter problems during the reassembly process. If the piston pump is reinstalled and the distribution plate is not installed in place, it will be tested directly, resulting in the scrapping of the piston pump. Therefore, after replacing the seal, it is necessary to manually rotate it to confirm that it is correct before starting the engine.
11、 Q: What are the common places where excavator seals leak oil? Analysis of common seal oil leakage situations? Answer:
1、 Excavator engine exhaust pipe oil leakage high fault - possible causes of the fault:
Firstly, this is not the engine oil that comes with the fourth engine kit. It may be due to an excess of engine oil
2. There are cracks in the cylinder head. Why is the excavator leaking oil
3. The valve guide of the excavator is faulty, causing oil leakage from the exhaust pipe of the excavator engine
4. The seal of the intermediate part of the excavator turbocharger is broken, so the engine oil is discharged through the exhaust pipe
Why does the excavator have high crankcase pressure and oil leakage
6. Wear of cylinder liners, pistons, and piston seals in excavator engines. Why does the excavator leak oil
7. The separation effect of the excavator oil and gas separator is not good, causing oil leakage in the excavator engine exhaust pipe. 8. There are also defects in the design or manufacturing of other components such as the body and piston
 

Inspection method for oil leakage in excavator engine exhaust pipe:

Firstly, check if there is much oil leaking from the exhaust pipe? If there is not much (less than five drops per day), then it may be normal. 2. If there is a lot of leakage, it is necessary to consider whether the engine cylinder liner, piston, piston seals, etc. are worn, causing the excavator C engine exhaust pipe to leak oil. 3. If not, then check to see if there is too much oil. Why does the excavator leak oil
If none of them are correct, continue to check the seals of the turbocharger intermediate to see if the seals are damaged
12、 Q: What seals are mainly used for excavator oil cylinders? A: They are mainly composed of end cap seals and piston seals, collectively referred to as sealing rings (seals).
 

Seal kits for Excavator

◆Boom seals kit

◆Arm seals kit

◆Bucket seals kit

◆Hydraulic pump seals kit

◆Control valve seals kit

◆Travel motor seals kit

◆Swing motor seals kit

◆Center Joint seal kit

◆Control Valve Seal Kit

◆Track Adjuster Seal kit

◆Pilot gear pump seal kit and more.