A. Roller, the middle shaft and bearings, cylinder pin and bearing, boom hinge shaft and bearing wear and tear.
    B. All parts are filled with some lubricants to extend the bearing life.
    C. Oil and oil level of hydraulic oil. Lifting platform full rise, in this position, the hydraulic ground should be higher than the bottom 40 to 50 mm. Such as the discovery of hydraulic oil darkening, sticky or gravel and other foreign matter, should be replaced.

Next: When the crank boom lifts the attention of what matters