Gantry crane how to change the walking speed?
There is a replacement of the old 20 gearbox of the first gear of the two gears that need a certain maintenance technology
Replace the entire gearbox to replace him with 30 or 45 digits representing the number of meters running in one minute
as long as you have this confidence and technical ability can also change your own hands to the best of you can change the product Gearbox convenience
