The steps and methods for repairing ISUZU compressed garbage trucks are as follows:

1. Inspection and troubleshooting: Before starting maintenance, conduct a comprehensive inspection of the garbage truck to find and eliminate any existing faults. For example, check the hydraulic system, electronic and electrical systems and mechanical components to ensure that all functions of the vehicle are functioning properly.

2. Replace damaged parts: If any damaged parts are found, such as hydraulic pumps, cylinders, transmission systems, etc., they need to be replaced in time. Make sure to choose original or high-quality replacement parts that are compatible with the ISUZU compressed garbage truck to ensure the long-term stable operation of the vehicle.

3. Lubricate and clean: Maintain and clean the vehicle's lubrication system, including adding lubricating oil, replacing filters, cleaning the fuel tank, etc. Ensure the lubrication system is working properly to reduce component wear and extend the life of the vehicle.

4. Calibration and adjustment: Calibrate and adjust the hydraulic system, transmission system, etc. to ensure that they work within normal parameter ranges. Adjust the cylinder stroke and improve compression efficiency to improve the working efficiency and performance of the garbage truck.

5. Carry out testing and maintenance: After completing the repair, test the entire vehicle to ensure that the repaired problems have been completely resolved, and perform necessary maintenance work. Such as changing engine oil, checking fuel system, cleaning car body, etc. At the same time, maintenance suggestions are provided to vehicle owners, including the key points of regular maintenance and upkeep, to extend the service life of garbage trucks.

To sum up, the maintenance of ISUZU compressed garbage trucks includes five aspects: checking faults, replacing damaged parts, lubrication and cleaning, calibration and adjustment, and testing and maintenance. Through regular repair and maintenance, the normal operation of the garbage truck can be ensured and its service life can be extended.