Market supply and demand Increased supply: China has a huge number of used construction machinery vehicles, which are still increasing. In 2025, the number of vehicles has exceeded 9 million, providing sufficient supply sources for the second-hand market. At the same time, as the speed of equipment replacement accelerates, more old equipment will flow into the second-hand market, increasing market supply and exerting downward pressure on prices. Demand fluctuations: From a domestic perspective, although infrastructure construction is still advancing, the growth rate may slow down, and the demand for second-hand excavators is relatively stable or slightly declining. However, in Asia, Africa and other regions, infrastructure demand is strong, and the export volume of used excavators has exceeded the domestic sales of new machines in 2024. In January 2025, the export orders of second-hand excavators accounted for 37%, and overseas market demand has become an important factor supporting prices. If overseas market demand continues to grow, it will alleviate the pressure of oversupply in the domestic market to a certain extent, and stabilize or increase the price of second-hand excavators. Economic situation Global economy: If the global economy maintains stable growth, the demand for excavators in industries such as infrastructure construction……

1. The weight and bucket capacity of the CAT 336 excavator are fully considered to prevent the excavator from tipping over due to the excessive weight of the crushing hammer when the boom is fully extended. Choosing a hammer that is too large may cause the excavator to tip over, while a hammer that is too small may not fully utilize the excavator’s capabilities and accelerate damage to the hammer. Only when the weight of the excavator and the breaking hammer matches can they fully utilize their effectiveness. In general, the standard bucket capacity of an excavator reflects the weight of the machine. The current good method is to calculate the range of optional breaking hammers based on the bucket capacity of the excavator.     The relationship between bucket capacity and hydraulic hammer weight is as follows: Wh=(0.6~0.8)(W4+ρV)   In the formula: Wh=Wl+W2+W3W1- weight of hydraulic hammer body (bare hammer) W2- weight of drill rod W3- weight of hydraulic hammer frame W4- weight of excavator bucket itself ρ – sand density, generally ρ=l600N/m3V – bucket capacity of excavator bucket   2. The working flow rate and pressure of the hydraulic breaker of Carter 336 excavator are different. The flow……

Cat 320D excavator fuel system issue: Fuel system failure is one of the main reasons for unstable engine speed. Fuel filter blockage, insufficient fuel pump pressure, and clogged fuel injectors can all affect fuel supply and cause unstable engine speed.     Cat 320D excavator ignition system issue: Ignition system faults, such as ignition coil failure, spark plug wear, poor ignition circuit contact, etc., can affect the ignition effect of the engine and cause speed fluctuations.   Mechanical failure: Internal mechanical failures of the engine, such as excessive valve clearance, valve spring breakage, piston wear, etc., can cause unstable engine operation.   Sensor and electrical system issues: Sensor failures or control module problems can also affect the engine’s speed control, leading to unstable speed.   Air filter issue: Air filter blockage or air leakage in the intake pipe can cause insufficient engine intake, affecting combustion efficiency and power output, resulting in unstable engine speed.   Hydraulic system issues with Cat 320D excavator: Hydraulic system failures, such as main pump wear and improper relief valve settings, can affect the efficiency and stability of the excavator, thereby affecting engine speed.   The methods to solve the problems of these cat 320D used……

Hitachi 200 excavator fault code：     11100-2 engine speed abnormality   11101-3 Engine Speed Control Knob Sensor High Voltage Abnormal   11101-4 Engine Speed Control Knob Sensor Low Pressure Abnormal   11200-3 Pump 1 Oil Delivery Pressure Sensor High Pressure Abnormal   11200-4 Pump 1 Oil Delivery Pressure Sensor Low Pressure Abnormal   11202-3 Pump 2 Oil Delivery Pressure Sensor High Pressure Abnormal   11202-4 Pump 2 Oil Delivery Pressure Sensor Low Pressure Abnormal   11206-3 Pump 1 Pump Control Pressure Sensor High Pressure Abnormal   11208-4 Pump 2 Pump Control Pressure Sensor Low High Pressure Abnormal   11301-3 Rotary Pilot Pressure Sensor High Pressure Abnormal   11301-4 Rotary Pilot Pressure Sensor Low Pressure Abnormal   Example:   Fault code: 11301-4   Fault problem: Abnormal low pressure of the rotary pilot pressure sensor   Fault cause: Voltage less than 0.25V   Affected control:   (1) Stick regeneration control   (2) Attachment flow control   (3) Rotation alarm control   resolvent:   (1) The combination of boom retraction and rotation operation results in slow boom speed   (2) If the machine is equipped with a rotary alarm and the rotary alarm continues to sound when it is activated   The……