How to use heavy truck automatic adjusting arm1. The working principle of the automatic adjustment arm for heavy trucks1, the gap angle is the normal gap corresponding to the brake drum and friction lining;2, the excess clearance angle corresponds to the increased clearance due to friction lining wear;3. The elastic angle corresponds to the elasticity caused by the brake drum, friction lining, brake cylinder and brake system power transmission.When the gap is automatically adjusted, try to avoid the elastic angle in the angular stroke. If the excess clearance angle and the elastic angle are not distinguished, compensation is always made at any time, which will result in over-adjustment, resulting in "dragging" or even "locking".How to use heavy truck automatic adjusting armSecond, heavy truck automatic adjustment arm functionThere are many functions of the automatic adjustment arm for heavy trucks, which are mainly summarized as the following: First, it enables the car to brake well when braking, increasing the safety and stability of the car driving; it reduces the energy waste of compressed air, Extend the use time limit of the air compression system, brake components and related parts; its installation and operation are relatively simple, so the number of maintenance is reduced, and the time and money cost are greatly reduced.How to use heavy truck automatic adjusting armThree, heavy truck automatic adjustment arm removal steps1. Remove the split pin and cylindrical plug connected to the brake cylinder to separate the brake cylinder from the automatic adjustment arm of the heavy truck.2. Remove the axial positioning spacers, bolts (or washers and circlips) at the upper end of the camshaft.3. Use the SWl2 wrench to turn the worm hexagonal head counterclockwise (the torque required for rotation is larger, and a click will be heard) until the handle of the automatic adjustment arm of the heavy truck is disengaged from the U-shaped fork of the sub-pump push rod.4. Remove the support bolts, nuts and washers connecting the control arm and the positioning bracket. Finally, take out the automatic adjustment arm of the heavy truck from the camshaft.How to use heavy truck automatic adjusting armFourth, the maintenance of the automatic adjustment arm for heavy trucks1. Every 20,000 kilometers, the automatic adjustment arm of heavy trucks should be filled with lithium-based lubricant once.2. Every 20,000 kilometers, turn the worm hexagon head of the automatic adjustment arm of the heavy truck in reverse time, and measure whether the rotating torque is greater than 18N.m. Repeat the measurement three times. If the measured torque is less than 18N.m, it indicates that the automatic adjustment arm of the heavy truck is damaged. Replace the automatic adjustment arm assembly for heavy trucks in time.