In strict accordance with the rules and driving essentials operation, to avoid the shift 'to fight tooth', in order to reduce the wear of gears. Strict implementation of the maintenance system, strengthen the maintenance shifting device. When the gearshift lever system connected to improper adjustment should be timely, large-scale recycling of used digging machine business, to ensure good performance shifter. Focus on the self-locking mechanism of repair and maintenance, to positioning action to reduce or mis-aligned performance positioning ball, spring and fork shaft, should be repaired or replaced, the performance of self-locking self-locking mechanism is in good condition. It appears in the downhill track with 'skip-shift', a large second-hand digging machine recycling vendors should add block the action essentials will gear in a high - speed position or take 'grab block' (emergency downshift) measures to be driving machine down to its base after the inspection, troubleshooting; if the 'add block', 'grab the block' and again unsuccessful or 'skip-shift' (neutral in this case), the driver can control the engine speed at medium speed ( prevent engine flameout), Hohhot large recycling of used digging machine, using 'pumping' approach so that the machine slid into the base, and troubleshooting. If the 'add block', 'grab the block' and again unsuccessful or 'skip-shift' (neutral in this case), and the machine and in the next big ramp (in this case the machine at a fast speed to its base ' dive '), should be promptly shut down in accordance with the downhill action essentials and requirements to stop, then deduct fault.