Second Hand Diesel Generator Set

The second hand diesel generator set provided by Kecheng from China can meet the procurement needs of diesel generator sets with relatively limited budget. Our sets come from enterprise renewal or idle projects.They have all undergone 12 core tests and six refurbishment procedures to ensure that their critical performance such as fuel consumption and start-up success rate is no less than 85% of the new machine.Products meet the national basic standards, key components also enjoy 6-12 months of warranty.Whether it is temporary construction site power supply, rural infrastructure construction, equipment rental or emergency backup, this used generator set can provide stable power support while controlling costs. As a domestic manufacturer, Kecheng Power is committed to providing users with more cost-effective power supply options through reliable second-hand equipment.

Kecheng second hand diesel generator sets cover three power ranges: small (20-100KW), medium (100-500KW), and large (500-1000KW):

Application scenarios (Exclusive adaptation for second-hand units)

1. Budget limited enterprises and small and micro enterprises scenarios (20-500KW)

• Applicable scenarios: Backup power for small processing plants (clothing, hardware), backup power for medium-sized supermarket cold chain, and power supply for basic equipment in township hospitals (infusion pumps, vaccine refrigeration)

• Core value: The price of second-hand units is only 50% to 70% of that of new ones, significantly reducing the initial investment of enterprises. Kecheng offers "test reports + warranty" to avoid the risk of "three-no and second-hand" products. The average daily fuel consumption of the small-sized model (20-100KW) is the same as that of the new model (20-50L), and the operating cost is controllable. It is suitable for long-term backup in small and micro enterprises.

2. Temporary projects and short-term usage scenarios (50-1000KW)

• Applicable scenarios: Temporary lighting/equipment power supply for road maintenance, main power supply during the construction period of building projects (6-12 months), and temporary power supply for exhibitions/events

• Core value: The delivery cycle for second-hand units is short (mainly in stock, with delivery within 3-7 days), and there is no need to wait for the production of new units. After the project is completed, Kecheng will provide "repurchase or resale assistance" to reduce idle losses. The large models (500-1000KW) can withstand a starting current of 2.5 times and can drive project crushers and pavers, meeting short-term heavy-load demands.

3. Rural Infrastructure and People's Livelihood Scenarios (20-200KW)

• Applicable scenarios: Water pumping at rural water conservancy stations, joint power supply in remote villages (30-50 households), and basic electricity usage in rural schools/clinics

• Core value: The second-hand units are suitable for the characteristic of "limited maintenance capacity" in rural areas. When Kecheng renovates, it selects general wear parts (which can be purchased locally) to reduce the difficulty of later maintenance. The medium-sized model (100-200KW) is equipped with a large-capacity fuel tank (500L), allowing for continuous operation for 20 hours when fully fueled, solving the problem of inconvenient refueling in rural areas. The price is affordable and it is suitable for low-cost power supply to rural collectives.

4. Equipment Rental and emergency disaster relief scenarios (50-1000KW)

• Applicable scenarios: Leasing companies renting out (for construction sites and events), power supply for temporary resettlement sites after floods/earthquakes, and power supply for locust plague control equipment (sprayers)

• Core value: Second-hand units offer high cost performance, requiring less investment and quick return on investment for leasing companies. Kecheng provides "batch refurbishment + unified warranty", which is convenient for leasing management. In emergency scenarios, second-hand units are available in stock and can be dispatched to the disaster area within 12 hours. They are IP54 dustproof and waterproof (for some models), making them suitable for harsh disaster relief environments. After the lease, Kecheng provides "on-site maintenance" to reduce the operation and maintenance pressure on the leasing company.

5. Large enterprise backup and capacity transition scenarios (500-1000KW)

• Applicable scenarios: Backup power supply for large factories (chemical, mechanical) (to deal with power outages in the power grid), transitional power supply during the construction of new factories, and temporary energy replenishment before equipment renewal in old factories

• Core value: The price of large second-hand units is only about 60% of that of new ones, and the enterprise's backup investment cost is low. Kecheng can upgrade the control system according to the needs of enterprises (such as adding the function of linkage with the factory DCS) to adapt to the existing production system. In transitional scenarios, the units can be put on standby after the new equipment is in place or resold with the assistance of Kecheng, achieving a high resource utilization rate.

Product advantages (Core Competitiveness of second-hand units)

Technical parameters (Full power range of 20-1000KW, after refurbishment)

Technical features (Exclusive design for second-hand units)

1. Kecheng's "1+N" inspection and refurbishment system

•1 set of core testing standards:

① Engine inspection: For small units, measure cylinder pressure (≥ 90% of the standard value), oil pressure (≥0.3MPa), and atomization of fuel injectors. For medium and large-sized units, add valve clearance (in compliance with original factory standards), turbocharger speed (deviation ≤5%), and high-pressure oil pump pressure (stable compliance).

② Generator testing: Insulation resistance (small size ≥50MΩ, large size ≥100MΩ), excitation system output (stable voltage without fluctuation), load test (voltage deviation ≤±5% under 25%/50%/100% load);

③ Electrical and structural inspection: ATS switching function (≤15 seconds), cable insulation (no aging or damage), body sealing (IP54 compliance, replacement of aged sealing rings), safety protection (overload/high temperature/low oil pressure protection tests normal).

•N customized renovation services:

① Basic renovation: Replace all vulnerable parts (filter elements, belts, batteries, sealing rings) of the units, clean the scale in the oil tank/radiator, and repair minor structural deformations.

② Function upgrade: Medium-sized units can be optionally equipped with ATS and remote monitoring (4G). Large-scale units can be upgraded with high-voltage systems (6kV), grid connection functions, and solar complementary functions (suitable for rural and remote scenarios).

③ Appearance repair: Repaint (match the original factory color code), replace damaged markings, and organize the circuits (avoid short circuits caused by clutter) to enhance the overall appearance and safety of the unit.

2. Performance adaptation and stability optimization

• Fuel consumption control: During refurbishment, calibrate the engine's fuel injection system (such as adjusting the fuel injection advance Angle), and the measured fuel consumption deviation should be no more than 10% for new machines to avoid the "high fuel consumption" problem of second-hand units. For medium and large-sized units, the "Economic Speed" function can be optionally installed. When the load is ≤50%, the speed will automatically decrease, further reducing fuel consumption by 10% to 15%.

• Start-up optimization: Replace the new battery (with capacity meeting the standard), clean the carbon brushes of the start-up motor. The start-up success rate of small units is ≥98%, and for large units (in low-temperature environments), a preheater can be optionally installed (the start-up success rate at -20℃ is ≥95%), solving the pain point of "difficult start-up" for second-hand units.

• Load Tolerance: Conduct maintenance on the generator excitation system (replace aged carbon brushes and adjust excitation current) to ensure that the unit can withstand 2.5 times the starting current (for small units) and 3 times the starting current (for large units), and is compatible with motor-type loads (such as water pumps and crushers) to avoid the problem of "unable to drive the load".

3. After-sales guarantee and residual value management

• Transparent warranty: We offer "inspection report + Warranty Agreement", clearly defining the warranty scope (engine, generator, core electrical components) and the warranty period (6-12 months). In case of quality issues during the warranty period, Kecheng will provide free on-site repair services (response within 48 hours for remote areas), and original factory parts will be preferred for replacement.

• Easy maintenance design: When refurbishing, common wear parts used in the African/local market (such as those compatible with the filter elements of new Yuchai/Weichai machines) are selected. A "maintenance manual + local spare parts purchase list" is provided. Users can replace the filter elements and belts by themselves without relying on Kecheng, reducing maintenance costs.

• Residual Value Recovery: Kecheng offers a "repurchase + resale assistance" service. Users can apply for repurchase (30%-60% of the assessed value) within three years of use, or Kecheng will assist in reselling to other users in need, reducing equipment idleness losses and improving resource utilization.

Power selection (Precise matching of second-hand units)

1.Core Selecting basis

2.Power recommendation for typical scenarios

Usage Method (Exclusive operation for second-hand units)

1.Pre-startup inspection (Key points for second-hand units)

2.Startup operation (power division process)

(1) Small second-hand units (20-100KW)

1. Preparation: Confirm that the load is disconnected, open the fuel valve, and retest the generator insulation (make sure there is no moisture drop).

2. Startup: For low temperatures (≤10℃), press the "Preheat" button (30 seconds), then press the "Start" button. Observe the engine speed (1500r/min±50r/min) and oil pressure (≥0.3MPa), and stabilize for 3 minutes.

3. Loading: First, close 1/3 of the load (such as lighting, small motors), run for 5 minutes, and then gradually increase to full load. Avoid loading at one time (the load tolerance of second-hand units is slightly weaker than that of new ones).

(2) Large second-hand units (500-1000KW)

1. Preparation: Check whether the grounding of the high-voltage system (such as the 6kV model) is reliable, test the ATS switching function (to ensure it is normal), and clean the dust on the surface of the radiator (it may accumulate after renovation).

2. Startup: Hydraulic startup. Observe the engine cylinder pressure (the instrument panel shows ≥ 90% of the standard value) and water temperature (≤85℃). After the excitation system output stabilizes, close the high-voltage circuit breaker.

3. Staged loading: Load in the order of "25%→50%→75%→100%", with a 10-minute interval between each stage. Monitor fuel consumption (whether it exceeds the measured value after refurbishment by 10%) and body vibration (whether there are any abnormal noises) in real time.

3. Operation Monitoring and Shutdown (Key Points for Second-hand Units)

• Real-time monitoring

①Pay special attention to the engine oil temperature (≤95℃) and oil pressure (≥0.2MPa). For second-hand units, it is recommended to record every 15 minutes to avoid abnormalities caused by aging components.

② Fuel system: Check the fuel filter for clogging every day (the replacement cycle of the fuel filter for second-hand units is 1/3 shorter than that for new units). In rural areas with poor fuel quality, drain the water at the bottom of the fuel tank every day.

③ Electrical system: Safety protection functions (overload, high temperature) are tested weekly to ensure that second-hand electrical components do not age or fail.

• Exception handling:

① Oil pressure drop: Immediately reduce the load, check the oil level, and replenish if insufficient. If the oil level is normal, stop the machine to check the oil filter (it may be clogged, and for second-hand units, it is prone to be caused by impurities in the fuel).

② Voltage fluctuation: Shut down the machine to check the generator excitation system (it may be loose after renovation), re-tighten the wiring or contact the after-sales service of Kecheng.

③ Failed startup: First, check the battery (the battery life of a second-hand unit may be shorter than that of a new one), then check the fuel filter (whether it is clogged), and replace the spare filter element if necessary.

• Shutdown process:

① Unloading: Disconnect all loads and reduce to no-load.

② Cooling: Small units should run no-load for 5 minutes, while large units should run for 10 to 15 minutes (the turbocharger of a second-hand engine needs to be fully cooled).

③ Shutdown: Press the "Stop" button, close the fuel valve. If the machine is to be shut down for a long time (≥1 week), drain the fuel from the fuel tank (to prevent deterioration and blockage of the fuel line), and cover it with a dust cover.

Safety and Protection (Specifications for Second-hand Units)

1. Installation safety (Key points for second-hand units)

• Structure and Fixation:

① Inspect the frame of the unit (second-hand units may have slight deformation), reinforce loose parts, place small units on a horizontal cement platform, and place steel plates under the support legs of large units (to avoid uneven load-bearing).

② For second-hand trailer-mounted units, inspect the traction structure (for rust or cracks), disconnect the load when moving, and secure the cables to prevent component detachment due to jolts.

• Electrical safety:

① Grounding protection: Grounding must be redone (the original grounding of second-hand units may fail). Use 2-meter galvanized Angle steel to drive it into the ground, and the grounding resistance should be ≤4Ω (low voltage) /≤10Ω (high voltage).

② Cables and joints: Replace aged cables (second-hand unit cables may have been in use for many years), wrap joints with waterproof tape, and high-voltage model cables need to undergo insulation tests (≥100MΩ).

③ Anti-electric shock: Set up a fence around the unit and hang a sign that reads "Second-hand equipment, please read the manual before operation". Prohibit non-operating personnel from approaching.

• Fuel and Fire protection:

① Fuel storage: Second-hand fuel tanks may have slight corrosion. The sealing performance needs to be tested (no leakage). The fuel tank should be kept at least 5 meters away from the unit. Plastic tanks are strictly prohibited (they are prone to aging and leakage).

② Fire protection configuration: Two 8kg ABC dry powder fire extinguishers are equipped. The pressure should be checked monthly. The fuel system seal of the second-hand unit may be weaker than that of the new one, so fire prevention measures need to be strengthened.

2. Operational Safety (Key Points for second-hand units)

• Personnel requirements:

① Operators are required to read the "Second-hand Unit Operation Manual" provided by Kecheng, understand the refurbishment status of the unit (such as replaced parts and key monitoring indicators), and are prohibited from operating without a license.

② Do not open the body panel during operation (the internal circuits of second-hand units may have refurbished marks, avoid accidental touch). When inspecting, the machine must be shut down and the power cut off.

• Operating contraindications:

① Overloading operation is strictly prohibited (the load tolerance of second-hand units should not exceed 90% of that of new units) to prevent engine cylinder pulling due to overload and generator excitation damage.

② Do not use inferior fuel (second-hand fuel systems are more sensitive to impurities and are prone to clogging fuel injectors). It must be filtered before use (sulfur content ≤0.5%).

③ It is strictly prohibited to start a second-hand high-voltage unit without insulation testing (insulation may decline due to moisture, causing a short circuit).

• Emergency response:

① Oil leakage/fire: Immediately stop the machine, close the fuel valve, use a dry powder fire extinguisher to put out the fire, cover the oil leakage area with fireproof sand, and do not use water to extinguish the fire.

② Electrical fault: Disconnect the main power supply, use insulated tools to check the wiring (second-hand electrical components may be loose). Those without experience should contact Kecheng after-sales service. Do not disassemble high-voltage components by yourself.

3. Maintain Safety (Key point for second-hand units)

• Preparations before maintenance:

① Disconnect the power supply of the unit, close the fuel valve, and hang the "Under maintenance, Do not start" sign. Second-hand units may have hidden circuits, so make sure to completely cut off the power.

② Prepare the spare parts recommended by Kecheng (such as general-purpose filter elements and belts), and the maintenance tools should be insulated (for high-voltage models) to avoid electric shock.

• Core maintenance projects:

① Replacement of vulnerable parts: The filter element replacement cycle for second-hand units is 30% shorter than that for new ones (every 300 hours for small units and every 500 hours for large ones), and the belts should be inspected every six months (they may age faster).

② Engine maintenance: Check the quality of the engine oil every 500 hours (second-hand engine oil gets contaminated more quickly), and measure the cylinder pressure every 1000 hours (confirm no drop).

③ Electrical maintenance: Clean the carbon brushes of the generator every quarter (the carbon brushes of second-hand excitation systems may wear out faster), and test the safety protection functions (to avoid failure).

• Post-maintenance testing:

After the maintenance is completed, start the unit and run it no-load for 10 minutes to check if the voltage, oil pressure and water temperature are normal. Load 50% and run it for 30 minutes. After confirming there are no abnormalities, put it into use. Maintenance during the warranty period should be recorded for easy traceability after sale.

Maintenance and Servicing Schedule (Exclusive for Second-hand Units)