1. Daily maintenance: after each shift.
2. First-level technical maintenance: After accumulatively working 150 hours, forklifts whose working hours are less than 150 hours per year, perform first-level maintenance once a year.
3. Second-level technical maintenance: After accumulatively working 500 hours, forklifts with less than 500 hours of work every three years shall undergo a second-level maintenance every three years.
4. The running-in period of the internal combustion forklift is 50 hours after the forklift is used.
