1. Send the crane hydraulic pump or cylinder with air.

Air compression or expansion will cause the piston to slip or crawl. The elimination measure is to check the hydraulic pump, Huai'an Crane Rental Company Set a special exhaust device, and quickly run the whole stroke for several times to exhaust.

2. Good convergence in hydraulic cylinder.

The parts in the hydraulic cylinder of the crane are improperly assembled, the parts are deformed, worn or have excessive tolerance, and the action resistance is too large, which makes the piston speed of the hydraulic cylinder change with different travel positions, slip or crawl. Most of the reasons are due to poor assembly quality of parts, scars or sintered iron chips on the surface, which increase the resistance and reduce the speed. For example, the piston is different from the piston rod center or the piston rod is bent, the installation position on the hydraulic cylinder or piston rod guide rail is offset, and the seal ring is installed too tight or too loose. Huai'an Crane Leasing Company The solution is to repair or adjust, replace damaged parts, and clean up iron filings.

3. Poor lubrication or poor treatment of hydraulic cylinder bore.

Since the piston and cylinder, guide rail and piston rod are relatively moving, if the lubrication is poor or the hydraulic cylinder bore diameter is poor, the wear will be aggravated, and the straightness of the cylinder centerline will be reduced. In this way, when the piston works in the hydraulic cylinder, the friction resistance will vary from large to small, resulting in slipping or crawling. The elimination method is to repair the grinding hydraulic cylinder first, then prepare the piston as required, repair the grinding piston rod and guide sleeve configuration.