stainless steel pallet trucks are many reasons: the valve stem spring failure; inclined cylinder wall and seal excessive wear and tear; inclined cylinder too much dirt or seal too tight; piston card Cylinder wall or piston rod bending. The solution is the spring failure should immediately replace the new spring; seal serious wear and tear should be replaced immediately, if the cylinder is also serious wear and tear also need to replace the cylinder; tank dirt to clean more cleaning, as too tight seal can be adjusted, Deterioration of the wearing parts of the piston should be replaced immediately.