Digging machine maintenance tips
Posted: Dec 4th, '24, 20:55
With the progress of science and technology, modern excavators generally adopt the machine-electric-hydraulic integrated control mode. When we eliminate some faults, we mostly solve the problem of matching the engine - hydraulic pump - distribution valve - external load. In general, these aspects cannot be matched in excavators operations, which are often manifested as: the engine speed decreases, the working speed slows down, and the digging is weak.
1. The engine speed drops
First of all to test the output power of the engine itself, if the engine output power is much lower than the rated power, if the construction site to judge from the simplest way to start, first look at whether the fuel filter is blocked, whether there is a leak in the fuel road, the plunger in the fuel pump, the fuel injection head, the oil valve is seriously worn, the air filter inlet is smooth, The engine with turbocharger, whether the turbocharger is damaged, whether the engine is fast and high temperature, the oil viscosity decreases, resulting in the cylinder wall seal is not tight compression ratio decreases, whether the cylinder liner component wear causes serious gas in the cylinder, the engine valve seal is not tight, etc., these are all factors that seriously affect the engine power. If you exclude the insufficient output power of the engine itself, it is necessary to consider the matching problem of the flow of the hydraulic pump and the output power of the engine.
In the construction operation, according to the load requirements of the operation, the speed and the load (flow and pressure) are inversely proportional, that is, the product of the output pressure and flow of the pump is a constant, and the output power of the pump is constant or approximately constant; If the pump control system fails, the engine - pump - valve - load can not be optimized and matched in different working conditions, so that the excavator can not work normally. Combined with modern excavators is machine-electric-hydraulic integration products, high technical content, so when dealing with the fault, generally start with the electrical system, then check the hydraulic system, and finally check the mechanical transmission system. When checking the hydraulic system, step by step check from auxiliary oil circuit - control oil circuit - main oil circuit - control element.
2, the work speed is slow
If it is an excavators that has been used for many years, the speed has gradually slowed down, which is caused by normal wear. The main factors caused by the wear of all parts of the machine engine power decline and hydraulic system leakage, so a series of failures are manifested, due to the leakage caused by internal energy consumption, produce a lot of heat energy, so that the whole system rapidly heating up, hydraulic oil and engine oil viscosity decline, so that the whole system produces high temperature, manifested as a cooling car slightly faster, hotter and slower, which requires the whole machine overhaul, Repair and replace parts with excessive wear. If the new excavators suddenly slows down, it is necessary to first simplify and then complex, from the following aspects to check: First check whether the circuit fuse is open or short; Whether the pilot pressure is normal; Servo control valve - whether the servo piston is stuck; Distributor confluence failure; Eliminate other possibilities, and finally disassemble the hydraulic pump.
3. The excavators is weak
The weakness of the whole machine is divided into several aspects. First, the engine sharply slows down when the external load is large, which is manifested in the following two aspects:
(1) Check the engine power first as mentioned above. Yes Check whether hydraulic displacement follows constant power output. That is, the swash plate Angle can be adjusted to reduce the displacement without affecting the speed.
(2) The engine does not slow down when the load is large, and the system speed is normal; It is necessary to debug the system pressure, because the hydraulic components used by various manufacturers are different from the hydraulic system, the hydraulic cylinder pressure is different, as long as it is adjusted according to the manufacturer's standards. In addition, if the pressure of the relief valve is not adjusted when the relief valve is in good condition, it is necessary to check the adjustment system of the hydraulic pump, and even the cylinder block of the hydraulic pump, the valve plate, the plunger and other parts.
The common faults of general excavators are reflected in the above aspects. With the increase in the use of excavators, some common faults often occur in construction operations, and users who generally use excavators for more than one or two years can understand some of them; Such as: excavator walking deviation, the user can immediately realize: walking distribution oil seal (also known as center rotary joint oil seal) damage; The flow rate of the two hydraulic pumps is different; There's a problem with the motor on one side. Hydraulic cylinder rapid drainage: immediately realize that the safety relief valve is not tightly closed, or the cylinder oil seal is seriously damaged, and so on.
Choose DIG-DOG for high-quality, customizable brush cutters for skid steers with fast delivery. Contact us today to discover how our superior products can enhance your land management tasks!
for more info just visit our website at www.dig-dog.com
contact # : +86 158 6218 2088
email : sales@bonovogroup.com
1. The engine speed drops
First of all to test the output power of the engine itself, if the engine output power is much lower than the rated power, if the construction site to judge from the simplest way to start, first look at whether the fuel filter is blocked, whether there is a leak in the fuel road, the plunger in the fuel pump, the fuel injection head, the oil valve is seriously worn, the air filter inlet is smooth, The engine with turbocharger, whether the turbocharger is damaged, whether the engine is fast and high temperature, the oil viscosity decreases, resulting in the cylinder wall seal is not tight compression ratio decreases, whether the cylinder liner component wear causes serious gas in the cylinder, the engine valve seal is not tight, etc., these are all factors that seriously affect the engine power. If you exclude the insufficient output power of the engine itself, it is necessary to consider the matching problem of the flow of the hydraulic pump and the output power of the engine.
In the construction operation, according to the load requirements of the operation, the speed and the load (flow and pressure) are inversely proportional, that is, the product of the output pressure and flow of the pump is a constant, and the output power of the pump is constant or approximately constant; If the pump control system fails, the engine - pump - valve - load can not be optimized and matched in different working conditions, so that the excavator can not work normally. Combined with modern excavators is machine-electric-hydraulic integration products, high technical content, so when dealing with the fault, generally start with the electrical system, then check the hydraulic system, and finally check the mechanical transmission system. When checking the hydraulic system, step by step check from auxiliary oil circuit - control oil circuit - main oil circuit - control element.
2, the work speed is slow
If it is an excavators that has been used for many years, the speed has gradually slowed down, which is caused by normal wear. The main factors caused by the wear of all parts of the machine engine power decline and hydraulic system leakage, so a series of failures are manifested, due to the leakage caused by internal energy consumption, produce a lot of heat energy, so that the whole system rapidly heating up, hydraulic oil and engine oil viscosity decline, so that the whole system produces high temperature, manifested as a cooling car slightly faster, hotter and slower, which requires the whole machine overhaul, Repair and replace parts with excessive wear. If the new excavators suddenly slows down, it is necessary to first simplify and then complex, from the following aspects to check: First check whether the circuit fuse is open or short; Whether the pilot pressure is normal; Servo control valve - whether the servo piston is stuck; Distributor confluence failure; Eliminate other possibilities, and finally disassemble the hydraulic pump.
3. The excavators is weak
The weakness of the whole machine is divided into several aspects. First, the engine sharply slows down when the external load is large, which is manifested in the following two aspects:
(1) Check the engine power first as mentioned above. Yes Check whether hydraulic displacement follows constant power output. That is, the swash plate Angle can be adjusted to reduce the displacement without affecting the speed.
(2) The engine does not slow down when the load is large, and the system speed is normal; It is necessary to debug the system pressure, because the hydraulic components used by various manufacturers are different from the hydraulic system, the hydraulic cylinder pressure is different, as long as it is adjusted according to the manufacturer's standards. In addition, if the pressure of the relief valve is not adjusted when the relief valve is in good condition, it is necessary to check the adjustment system of the hydraulic pump, and even the cylinder block of the hydraulic pump, the valve plate, the plunger and other parts.
The common faults of general excavators are reflected in the above aspects. With the increase in the use of excavators, some common faults often occur in construction operations, and users who generally use excavators for more than one or two years can understand some of them; Such as: excavator walking deviation, the user can immediately realize: walking distribution oil seal (also known as center rotary joint oil seal) damage; The flow rate of the two hydraulic pumps is different; There's a problem with the motor on one side. Hydraulic cylinder rapid drainage: immediately realize that the safety relief valve is not tightly closed, or the cylinder oil seal is seriously damaged, and so on.
Choose DIG-DOG for high-quality, customizable brush cutters for skid steers with fast delivery. Contact us today to discover how our superior products can enhance your land management tasks!
for more info just visit our website at www.dig-dog.com
contact # : +86 158 6218 2088
email : sales@bonovogroup.com