Messy gear phenomenon is a manual transmission is the most common failure phenomenon, low plate manual transmission messy gear phenomenon refers to is in the clutch technical condition is normal, the transmission at the same time hang on two gears, or hang need to gear when the result of hanging into other gears. Few reasons for this failure, so corresponding, it is also much less troubleshooting methods and solutions. 

First, the interlocking device failure: such as fork shaft, interlocking pin or interlocking ball wear too much. Secondly, the arc-shaped working surface of the lower end of the gearshift is too worn or the groove of the toggle block on the fork shaft is too worn.

The third point, the shifter ball positioning pin broken or ball hole, ball wear too loose will also cause the phenomenon of low-flat manual transmission jump gears. In short, the main reason for the chaotic gear is caused by the failure of the transmission operating mechanism. With the above three points of analysis, we come one by one corresponding to the diagnosis and exclusion.

Low flatbed truck reliable parking, pull up the parking brake handle. Start the engine, idle the engine, step on the clutch pedal, shift to 1st gear or reverse gear, check whether there is noise, whether the gear shift is smooth. If there is noise or shift is not smooth, it means that the clutch of the low-flatbed truck is not completely separated. 

At this time, it is necessary to check the vehicle, including checking the free travel of the clutch pedal, checking the working condition of the clutch, checking the fluid level of the clutch reservoir and so on. Through these aspects, we can find out where the cause is and solve it.

After overhauling the hydraulic operating system of the clutch of the low-flatbed truck, air may enter the pipeline; when adding brake fluid, the hydraulic system may also enter the air. Air into, due to the shortening of the master cylinder pusher stroke that is the working stroke of the pedal, thus making the low-floor transportation truck clutch separation is not complete. Therefore, the hydraulic system overhaul or suspect that the hydraulic system into the air, we must exclude the air in the hydraulic system. Specific exclusion method has the following six points, let’s analyze one by one.

(1) the master cylinder reservoir in the brake fluid added to the prescribed height, raise the low-floor transportation vehicle; (2) in the master cylinder reservoir in the brake fluid added to the prescribed height, raise the low-floor transportation vehicle.

(2) Install a hose on the bleeder valve of the working cylinder to a container with brake fluid; (2) Install a hose on the bleeder valve of the working cylinder to a container with brake fluid.

(3) air venting requires two people to work together, one person slowly step on the clutch pedal several times, feel the resistance when the pedal does not move, the other person to loosen the bleeder valve until the brake fluid began to flow out, and then tighten the bleeder valve;

(4) Continuously several times according to the above method of operation, until the outflow of the brake fluid is not seen in the air bubbles.

(5) After the air is removed, you need to check and adjust the free travel of the pedal again; (6) This is the first time you need to check and adjust the free travel of the pedal.

(6) This is the last step, again check the master cylinder reservoir fluid level, if the height is not enough, then add.