Fuller rt11509c gearbox installed in sinotruk Steyr are often suddenly found to have only high speed gears and no low speed gears, or only low speed gears and no high speed gears. In fact, this failure occurs when the truck is running in low gear and shifts to high gear, and still ends up running in low gear. For example, when the truck is driving in 4th gear and shifted to 5th gear, the result shows the working status of the low gear of the gearbox.
This fault usually occurs in the control system of high and low gear shifts of the auxiliary box.
It is also worth noting that the gearbox has only high gear but no low gear, and the double h shift valve does not show continuous exhaust, so it is generally due to the air leakage of the “O” seal ring of the shift lever. At this time, it can be repaired by replacing the sealing ring.
In short, as long as we understand the structure and working principle of the shift control mechanism, main and auxiliary boxes of Fuller rt11509c transmission and carefully analyze the faults, it is not difficult to find the cause of the fault and there are no difficulties that cannot be eliminated.