Weichai generator, as core power equipment in industries, agriculture, and other fields, can extend their service life and improve operational efficiency through scientific maintenance. This article provides a systematic maintenance guide from oil selection, cooling system maintenance, fuel management to winter antifreeze.
1、 Oil selection: precise matching of viscosity and grade
1. Viscosity grade:
High temperature environment: Choose SAE 50 or SAE 40 (ambient temperature>40 ℃).
Low temperature environment: Choose SAE 15W-40 or 0W-40 (ambient temperature<-10 ℃).
Judgment criteria: Refer to the engine manual, combined with local climate and operating conditions.
2. API quality level:
Weichai engines recommend engine oils above CH-4/CI-4 grade to meet high load lubrication requirements.
Attention: Avoid mixing different brands of engine oil to prevent additive conflicts.
3. Replacement cycle:
New machine: Replace after 50 hours of initial operation and every 200 hours thereafter.
Old machine: According to oil sample testing (if the black carbon content is greater than 5%, it needs to be replaced in advance).
2、 Cooling system maintenance: equal emphasis on antifreeze and heat dissipation
1. Coolant selection:
Universal throughout the year: using long-lasting antifreeze (such as Weichai original -45 ℃ antifreeze).
Proportioning suggestion: Mix water and antifreeze in a 1:1 ratio, with a freezing point of up to -35 ℃.
2. Cleaning of radiator:
Step: After stopping the machine, use compressed air to blow the gaps of the heat sink and rinse with water pressure (pressure ≤ 0.2MPa).
Frequency: Clean willow catkins every spring and dust in autumn.
3. Thermostat inspection:
Method: After starting, observe the water temperature gauge. If it remains below 80 ℃ for a long time, the thermostat may fail.
Solution: Replace the original thermostat to avoid low water temperature in winter.
3、 Fuel system maintenance: dual use of filters and additives
1. Fuel filter:
Replacement cycle: Replace every 200 hours or when the fuel impurity content exceeds the standard.
Attention: Before replacement, check the filter paper for any metal debris (possibly due to wear inside the cylinder).
2. Fuel additives:
Recommendation: Use Weichai certified diesel pour point depressants (winter) or detergents (high sulfur oil areas).
Dosage: Add at a ratio of 1 ‰, excessive amount may cause nozzle blockage.
4、 Special measures for winter antifreeze
1. Antifreeze adjustment:
Freezing point detection: Use a freezing point tester to ensure that the temperature is 10 ℃ below the local minimum temperature.
Emergency response: Temporary addition of alcohol (≤ 20%) to lower the freezing point, which needs to be replaced afterwards.
2. Thermal insulation of generator set:
Fuel tank insulation: Install electric blankets or insulation sleeves (temperature set at 20 ℃).
Machine room sealing: check the door and window gaps and fill them with foam glue.
3. Start preheating:
Electric preheater: Start 2 hours in advance and heat to 40 ℃.
Start fluid assist: Spray for ≤ 3 seconds each time to avoid flooding the cylinder.
5、 Other key maintenance items
1. Air filter:
Replacement cycle: Replace every 500 hours or when the pressure difference is greater than 2.5kPa.
Cleaning method: Blow low-pressure air from inside out to avoid damaging the filter paper.
2. Battery maintenance:
Charging cycle: Recharge with a constant voltage charger every month (voltage 14.4V).
Life assessment: Replacement is required when the starting voltage is less than 10.5V.
6、 Troubleshooting and Emergency Response
Difficulty starting: Check fuel condensation (winter), battery voltage, and starter motor.
Overheating shutdown: Clean the radiator and check if the water pump impeller is damaged.
Abnormal smoke exhaust: blue smoke (burning engine oil), black smoke (excessive fuel injection), white smoke (leaking cylinder gasket).
conclusion
The maintenance of Weichai generators should be based on working conditions and environment, and a "prevention oriented" maintenance system should be established. Suggest developing an annual maintenance plan, recording key parameters such as oil pressure and water temperature, and regularly attending Weichai service station training to master the latest maintenance techniques. Through scientific maintenance, the failure rate can be significantly reduced and the equipment life cycle can be extended.
